The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform
Matthias Ihme - One of the best experts on this subject based on the ideXlab platform.
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large eddy simulations of transcritical injection and auto ignition using diffuse interface method and finite rate chemistry
Proceedings of the Combustion Institute, 2019Co-Authors: Peter C., Luis Bravo, Matthias Ihme, Hao Wu, Thomas JaravelAbstract:Abstract The need for improved engine efficiencies has motivated the development of high-pressure combustion systems, in which operating conditions achieve and exceed critical conditions. Associated with these conditions are strong variations in thermo-transport properties as the Fluid undergoes mixing and phase transition, and two-stage ignition with low-temperature combustion. Accurately simulating these physical phenomena at Real-Fluid environments remains a challenge. This study examines a diffuse-interface method for simulating the injection and ignition of n-dodecane at transcritical conditions. To this end, a compressible solver with a Real-Fluid state equation and finite-rate chemistry is employed. Simulations of an ECN-relevant diesel-fuel injector are performed for both inert and reacting conditions. For the spray ignition, four specific operating points (corresponding to ambient temperatures between 900 K and 1200 K) are investigated to examine effects of the Real-Fluid environment and low-temperature chemistry. Comparisons with available experimental data demonstrate that the presented numerical method adequately captures the diesel fuel injection and auto-ignition processes under transcritical conditions.
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thermodynamic structure of supercritical lox gh2 diffusion flames
Combustion and Flame, 2018Co-Authors: Daniel T. Banuti, Peter C., Matthias Ihme, Jean-pierre HickeyAbstract:Abstract In this study, we evaluate the thermodynamic structure of laminar hydrogen/oxygen flames at supercritical pressures using 1D flame calculations and large-eddy simulation (LES) results. We find that the Real Fluid mixing behavior differs between inert (cold flow) and reactive (hot flow) conditions. Specifically, we show that combustion under transcritical conditions is not dominated by large-scale homogeneous Real-Fluid mixing: similar to subcritical atomization, the supercritical pure oxygen stream undergoes a distinct transition from liquid-like to gas-like conditions; significant mixing and combustion occurs primarily after this transition under ideal gas conditions. The joint study of 1D flame computations and LES demonstrates that Real-Fluid behavior is chiefly confined to the bulk LOX stream; Real Fluid mixing occurs but in a thin layer surrounding the LOX core, characterized by water mass fractions limited to 3%. A parameter study of 1D flame solutions shows that this structure holds for a wide range of relevant injection temperatures and chamber pressures. To analyze the mixing-induced shift of the local Fluid critical point, we introduce a state-space representation of the flame trajectories in the reduced temperature and reduced pressure plane which allows for a direct assessment of the local thermodynamic state. In the flame, water increases the local mixture critical pressures, so that subcritical conditions are reached. This view of limited mixing under supercritical conditions may yield more efficient models and an improved understanding of the disintegration modes of supercritical flows.
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Numerical analysis on mixing processes for transcritical Real-Fluid simulations
arXiv: Fluid Dynamics, 2017Co-Authors: Peter C., Daniel T. Banuti, Matthias IhmeAbstract:The accurate and robust simulation of transcritical Real-Fluid flows is crucial for many engineering applications. Diffused interface methods are frequently employed and several numerical schemes have been developed for simulating transcritical flows. These schemes can be categorized into two types, namely fully conservative and quasi-conservative schemes. An adaptive scheme which is a hybrid of the two is developed in this study. By considering several numerical test cases, it is shown that different schemes predict distinctly different mixing behaviors. It is shown that the mixing processes follow the isobaric-adiabatic and isobaric-isochoric mixing models for fully and quasi-conservative schemes, respectively, and the adaptive scheme yields a mixing behavior that spans both models. The distinct mixing behaviors are a consequence of numerical diffusion instead of physical diffusion and can be attributed to insufficient numerical spatial resolution. This work provides a better understanding on the interpretation of numerical simulation results and the mixing models that are commonly used to study transcritical flows.
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Numerical framework for transcritical Real-Fluid reacting flow simulations using the flamelet progress variable approach
55th AIAA Aerospace Sciences Meeting, 2017Co-Authors: Peter C., Daniel T. Banuti, Jean-pierre Hickey, Matthias IhmeAbstract:An extension to the classical FPV model is developed for transcritical Real-Fluid combustion simulations in the context of finite volume, fully compressible, explicit solvers. A double-flux model is developed for transcritical flows to eliminate the spurious pressure oscillations. A hybrid scheme with entropy-stable flux correction is formulated to robustly represent large density ratios. The thermodynamics for ideal-gas values is modeled by a linearized specific heat ratio model. Parameters needed for the cubic EoS are pre-tabulated for the evaluation of departure functions and a quadratic expression is used to recover the attraction parameter. The novelty of the proposed approach lies in the ability to account for pressure and temperature variations from the baseline table. Cryogenic LOX/GH2 mixing and reacting cases are performed to demonstrate the capability of the proposed approach in multidimensional simulations. The proposed combustion model and numerical schemes are directly applicable for LES simulations of Real applications under transcritical conditions.
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An entropy-stable hybrid scheme for simulations of transcritical Real-Fluid flows
Journal of Computational Physics, 2017Co-Authors: Peter C., Matthias IhmeAbstract:Abstract A finite-volume method is developed for simulating the mixing of turbulent flows at transcritical conditions. Spurious pressure oscillations associated with fully conservative formulations are addressed by extending a double-flux model to Real-Fluid equations of state. An entropy-stable formulation that combines high-order non-dissipative and low-order dissipative finite-volume schemes is proposed to preserve the physical Realizability of numerical solutions across large density gradients. Convexity conditions and constraints on the application of the cubic state equation to transcritical flows are investigated, and conservation properties relevant to the double-flux model are examined. The resulting method is applied to a series of test cases to demonstrate the capability in simulations of problems that are relevant for multi-species transcritical Real-Fluid flows.
Peter C. - One of the best experts on this subject based on the ideXlab platform.
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large eddy simulations of transcritical injection and auto ignition using diffuse interface method and finite rate chemistry
Proceedings of the Combustion Institute, 2019Co-Authors: Peter C., Luis Bravo, Matthias Ihme, Hao Wu, Thomas JaravelAbstract:Abstract The need for improved engine efficiencies has motivated the development of high-pressure combustion systems, in which operating conditions achieve and exceed critical conditions. Associated with these conditions are strong variations in thermo-transport properties as the Fluid undergoes mixing and phase transition, and two-stage ignition with low-temperature combustion. Accurately simulating these physical phenomena at Real-Fluid environments remains a challenge. This study examines a diffuse-interface method for simulating the injection and ignition of n-dodecane at transcritical conditions. To this end, a compressible solver with a Real-Fluid state equation and finite-rate chemistry is employed. Simulations of an ECN-relevant diesel-fuel injector are performed for both inert and reacting conditions. For the spray ignition, four specific operating points (corresponding to ambient temperatures between 900 K and 1200 K) are investigated to examine effects of the Real-Fluid environment and low-temperature chemistry. Comparisons with available experimental data demonstrate that the presented numerical method adequately captures the diesel fuel injection and auto-ignition processes under transcritical conditions.
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thermodynamic structure of supercritical lox gh2 diffusion flames
Combustion and Flame, 2018Co-Authors: Daniel T. Banuti, Peter C., Matthias Ihme, Jean-pierre HickeyAbstract:Abstract In this study, we evaluate the thermodynamic structure of laminar hydrogen/oxygen flames at supercritical pressures using 1D flame calculations and large-eddy simulation (LES) results. We find that the Real Fluid mixing behavior differs between inert (cold flow) and reactive (hot flow) conditions. Specifically, we show that combustion under transcritical conditions is not dominated by large-scale homogeneous Real-Fluid mixing: similar to subcritical atomization, the supercritical pure oxygen stream undergoes a distinct transition from liquid-like to gas-like conditions; significant mixing and combustion occurs primarily after this transition under ideal gas conditions. The joint study of 1D flame computations and LES demonstrates that Real-Fluid behavior is chiefly confined to the bulk LOX stream; Real Fluid mixing occurs but in a thin layer surrounding the LOX core, characterized by water mass fractions limited to 3%. A parameter study of 1D flame solutions shows that this structure holds for a wide range of relevant injection temperatures and chamber pressures. To analyze the mixing-induced shift of the local Fluid critical point, we introduce a state-space representation of the flame trajectories in the reduced temperature and reduced pressure plane which allows for a direct assessment of the local thermodynamic state. In the flame, water increases the local mixture critical pressures, so that subcritical conditions are reached. This view of limited mixing under supercritical conditions may yield more efficient models and an improved understanding of the disintegration modes of supercritical flows.
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Numerical analysis on mixing processes for transcritical Real-Fluid simulations
arXiv: Fluid Dynamics, 2017Co-Authors: Peter C., Daniel T. Banuti, Matthias IhmeAbstract:The accurate and robust simulation of transcritical Real-Fluid flows is crucial for many engineering applications. Diffused interface methods are frequently employed and several numerical schemes have been developed for simulating transcritical flows. These schemes can be categorized into two types, namely fully conservative and quasi-conservative schemes. An adaptive scheme which is a hybrid of the two is developed in this study. By considering several numerical test cases, it is shown that different schemes predict distinctly different mixing behaviors. It is shown that the mixing processes follow the isobaric-adiabatic and isobaric-isochoric mixing models for fully and quasi-conservative schemes, respectively, and the adaptive scheme yields a mixing behavior that spans both models. The distinct mixing behaviors are a consequence of numerical diffusion instead of physical diffusion and can be attributed to insufficient numerical spatial resolution. This work provides a better understanding on the interpretation of numerical simulation results and the mixing models that are commonly used to study transcritical flows.
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Numerical framework for transcritical Real-Fluid reacting flow simulations using the flamelet progress variable approach
55th AIAA Aerospace Sciences Meeting, 2017Co-Authors: Peter C., Daniel T. Banuti, Jean-pierre Hickey, Matthias IhmeAbstract:An extension to the classical FPV model is developed for transcritical Real-Fluid combustion simulations in the context of finite volume, fully compressible, explicit solvers. A double-flux model is developed for transcritical flows to eliminate the spurious pressure oscillations. A hybrid scheme with entropy-stable flux correction is formulated to robustly represent large density ratios. The thermodynamics for ideal-gas values is modeled by a linearized specific heat ratio model. Parameters needed for the cubic EoS are pre-tabulated for the evaluation of departure functions and a quadratic expression is used to recover the attraction parameter. The novelty of the proposed approach lies in the ability to account for pressure and temperature variations from the baseline table. Cryogenic LOX/GH2 mixing and reacting cases are performed to demonstrate the capability of the proposed approach in multidimensional simulations. The proposed combustion model and numerical schemes are directly applicable for LES simulations of Real applications under transcritical conditions.
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An entropy-stable hybrid scheme for simulations of transcritical Real-Fluid flows
Journal of Computational Physics, 2017Co-Authors: Peter C., Matthias IhmeAbstract:Abstract A finite-volume method is developed for simulating the mixing of turbulent flows at transcritical conditions. Spurious pressure oscillations associated with fully conservative formulations are addressed by extending a double-flux model to Real-Fluid equations of state. An entropy-stable formulation that combines high-order non-dissipative and low-order dissipative finite-volume schemes is proposed to preserve the physical Realizability of numerical solutions across large density gradients. Convexity conditions and constraints on the application of the cubic state equation to transcritical flows are investigated, and conservation properties relevant to the double-flux model are examined. The resulting method is applied to a series of test cases to demonstrate the capability in simulations of problems that are relevant for multi-species transcritical Real-Fluid flows.
Seong-ku Kim - One of the best experts on this subject based on the ideXlab platform.
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effects of pressure and inlet temperature on coaxial gaseous methane liquid oxygen turbulent jet flame under transcritical conditions
Journal of Supercritical Fluids, 2013Co-Authors: Taehoon Kim, Yongmo Kim, Seong-ku KimAbstract:Abstract This study has investigated numerically turbulent flames of cryogenic oxygen and methane under supercritical pressures relevant to liquid propellant rocket engines. A Real-Fluid version of the flamelet equations is employed to accommodate simultaneously non-equilibrium chemistry of hydrocarbon fuel and non-ideal thermodynamics in local flame structures while the effect of turbulent fluctuations is accounted for via a presumed probability density functions. The present model reproduced qualitatively well the experimentally observed unique feature of a transcritical flame of coaxial gaseous methane/liquid oxygen injector, which is characterized by sudden flame expansion, abruptly terminated flame tip, and expansion induced flow recirculation. Numerical results reveal that pseudo-boiling phenomena occurred in the transcritical mixing layer between the cryogenic oxygen core and the surrounding hot gas play a crucial role in mixing and combustion processes. It is also found that the transcritical flame structure is drastically affected by elevating the chamber pressure or increasing the oxygen inlet temperature in terms of flame length, sudden expansion angle, and reverse flow strength. Detailed discussions are made for effects of the Real-Fluid behaviors on the turbulent flame field as well as on the local flame structure in mixture fraction space.
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Real-Fluid flamelet modeling for gaseous hydrogen/cryogenic liquid oxygen jet flames at supercritical pressure
The Journal of Supercritical Fluids, 2011Co-Authors: Taehoon Kim, Yongmo Kim, Seong-ku KimAbstract:Abstract The primary goal of this study is to numerically model the transcritical mixing and reacting flow processes encountered in liquid propellant rocket engines. In order to Realistically represent turbulence–chemistry interactions, detailed chemical kinetics, and non-ideal thermodynamic behaviors related to the liquid rocket combustion at supercritical pressures, the flamelet approach is coupled with Real-Fluid modeling based on the Soave–Redlich–Kwong (SRK) equation of state. To validate the Real-Fluid flamelet model, a gaseous hydrogen/cryogenic liquid oxygen coaxial jet flame at supercritical pressure has been chosen as a benchmark case. Numerical results are compared with experimental data obtained for the OH radical and the temperature distribution. It was found that weak flow recirculation is induced by the sudden expansion of cold core cryogenic oxygen associated with the pseudo-boiling process. This weak recirculation zone substantially influences the fundamental characteristics of liquid propellant reacting flows at supercritical pressures in terms of the spreading and the flame length. For the flame conditions employed in this study, the predicted contours of the OH radical are in good agreement with the experimental Abel transformed emission image in terms of the flame spreading angle and the flame location. Numerical results suggest that the Real-Fluid based flamelet model is capable of Realistically predicting the overall characteristics of a turbulent non-premixed GH 2 /LO x flame at supercritical pressures.
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Numerical study of cryogenic liquid nitrogen jets at supercritical pressures
The Journal of Supercritical Fluids, 2011Co-Authors: Taehoon Kim, Yongmo Kim, Seong-ku KimAbstract:Abstract This paper discusses numerical modeling of the mixing and flow processes of cryogenic liquids that are encountered in liquid propellant rocket engines. In the present approach, turbulence is represented by an extended k – ɛ turbulence model. A conserved scalar approach together with a presumed probability density function approach is utilized to account for scalar fluctuation effects on the turbulent mixing processes of Real Fluids over transcritical and supercritical states. The two Real-Fluid equations of state (EOS) and dense-Fluid correction schemes incorporated into our Real-Fluid code are validated for thermodynamic and transport properties over a wide range of pressures and temperatures. In this study, computations are made for four cryogen nitrogen jets at near-critical and supercritical pressures. Special emphasis is given to sensitivity analyses for two different equations of state. Based on our numerical results, the Real Fluid behaviors and precise structures of cryogenic nitrogen jets are discussed in detail. Numerical results indicate that the present Real-Fluid model has the predicative capabilities to simulate the essential features of the cryogenic liquid nitrogen jets. The PR equation predicts the slightly better conformity with measured nitrogen density profiles, compared to the SRK equation. It is also found that increases in pseudo-boiling strength result in increases in the cold potential core length as well as decreases in the decay rate of the axial velocity.
Daniel T. Banuti - One of the best experts on this subject based on the ideXlab platform.
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thermodynamic structure of supercritical lox gh2 diffusion flames
Combustion and Flame, 2018Co-Authors: Daniel T. Banuti, Peter C., Matthias Ihme, Jean-pierre HickeyAbstract:Abstract In this study, we evaluate the thermodynamic structure of laminar hydrogen/oxygen flames at supercritical pressures using 1D flame calculations and large-eddy simulation (LES) results. We find that the Real Fluid mixing behavior differs between inert (cold flow) and reactive (hot flow) conditions. Specifically, we show that combustion under transcritical conditions is not dominated by large-scale homogeneous Real-Fluid mixing: similar to subcritical atomization, the supercritical pure oxygen stream undergoes a distinct transition from liquid-like to gas-like conditions; significant mixing and combustion occurs primarily after this transition under ideal gas conditions. The joint study of 1D flame computations and LES demonstrates that Real-Fluid behavior is chiefly confined to the bulk LOX stream; Real Fluid mixing occurs but in a thin layer surrounding the LOX core, characterized by water mass fractions limited to 3%. A parameter study of 1D flame solutions shows that this structure holds for a wide range of relevant injection temperatures and chamber pressures. To analyze the mixing-induced shift of the local Fluid critical point, we introduce a state-space representation of the flame trajectories in the reduced temperature and reduced pressure plane which allows for a direct assessment of the local thermodynamic state. In the flame, water increases the local mixture critical pressures, so that subcritical conditions are reached. This view of limited mixing under supercritical conditions may yield more efficient models and an improved understanding of the disintegration modes of supercritical flows.
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Numerical analysis on mixing processes for transcritical Real-Fluid simulations
arXiv: Fluid Dynamics, 2017Co-Authors: Peter C., Daniel T. Banuti, Matthias IhmeAbstract:The accurate and robust simulation of transcritical Real-Fluid flows is crucial for many engineering applications. Diffused interface methods are frequently employed and several numerical schemes have been developed for simulating transcritical flows. These schemes can be categorized into two types, namely fully conservative and quasi-conservative schemes. An adaptive scheme which is a hybrid of the two is developed in this study. By considering several numerical test cases, it is shown that different schemes predict distinctly different mixing behaviors. It is shown that the mixing processes follow the isobaric-adiabatic and isobaric-isochoric mixing models for fully and quasi-conservative schemes, respectively, and the adaptive scheme yields a mixing behavior that spans both models. The distinct mixing behaviors are a consequence of numerical diffusion instead of physical diffusion and can be attributed to insufficient numerical spatial resolution. This work provides a better understanding on the interpretation of numerical simulation results and the mixing models that are commonly used to study transcritical flows.
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Numerical framework for transcritical Real-Fluid reacting flow simulations using the flamelet progress variable approach
55th AIAA Aerospace Sciences Meeting, 2017Co-Authors: Peter C., Daniel T. Banuti, Jean-pierre Hickey, Matthias IhmeAbstract:An extension to the classical FPV model is developed for transcritical Real-Fluid combustion simulations in the context of finite volume, fully compressible, explicit solvers. A double-flux model is developed for transcritical flows to eliminate the spurious pressure oscillations. A hybrid scheme with entropy-stable flux correction is formulated to robustly represent large density ratios. The thermodynamics for ideal-gas values is modeled by a linearized specific heat ratio model. Parameters needed for the cubic EoS are pre-tabulated for the evaluation of departure functions and a quadratic expression is used to recover the attraction parameter. The novelty of the proposed approach lies in the ability to account for pressure and temperature variations from the baseline table. Cryogenic LOX/GH2 mixing and reacting cases are performed to demonstrate the capability of the proposed approach in multidimensional simulations. The proposed combustion model and numerical schemes are directly applicable for LES simulations of Real applications under transcritical conditions.
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an efficient multi Fluid mixing model for Real gas reacting flows in liquid propellant rocket engines
Combustion and Flame, 2016Co-Authors: Daniel T. Banuti, Volker Hannemann, Klaus Hannemann, Bernhard WeigandAbstract:Abstract This paper introduces a new model for Real gas thermodynamics, with improved accuracy, performance, and robustness compared to state-of-the-art models. It is motivated by the physical insight that in non-premixed flames, as encountered in high pressure liquid propellant rocket engines, mixing takes place chiefly in the hot reaction zone among ideal gases. We developed a new model taking advantage of this: When Real Fluid behavior only occurs in the cryogenic oxygen stream, this is the only place where a Real gas equation of state (EOS) is required. All other species and the thermodynamic mixing can be treated as ideal. Real Fluid properties of oxygen are stored in a library; the evaluation of the EOS is moved to a preprocessing step. Thus decoupling the EOS from the runtime performance, the method allows the application of accurate high quality EOS or tabulated data without runtime penalty. It provides fast and robust iteration even near the critical point and in the multiphase coexistence region. The model has been validated and successfully applied to the computation of 0D phase change with heat addition, and a supercritical reactive coaxial LOX/GH 2 single injector.
Hubert Chanson - One of the best experts on this subject based on the ideXlab platform.
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Applied Hydrodynamics: An Introduction to Ideal and Real Fluid Flows - Applied Hydrodynamics: An Introduction to Ideal and Real Fluid Flows
2009Co-Authors: Hubert ChansonAbstract:Fluid dynamics is the engineering science dealing with forces and energies generated by Fluids in motion. Fluid dynamics and hydro-dynamics play a vital role in everyday life. Practical examples include the flow motion in the kitchen sink, the exhaust fan above the stove, and the air conditioning system in our home. When driving a car, the air flow around the vehicle body induces some drag which increases with the square of the car speed and contributes to excess fuel consumption. Engineering applications encompass: applied hydrodynamics and Fluid transport in pipes and canals, environmental processes and transportation (cars, ships, aircrafts), hydraulic and coastal structures, wind flow around buildings, aerodynamics Fluid circulations in lakes, oceans and atmosphere energy generation, Fluid motion in the human body. This advanced undergraduate and post-graduate textbook deals with the topic of applied hydrodynamics. The lecture material is grouped into two complementary sections: ideal Fluid flow and Real Fluid flow. The former deals with two- and possibly three-dimensional Fluid motions that are not subject to boundary friction effects, while the latter considers the flow regions affected by boundary friction and turbulent shear. The lecture material is designed as an intermediate course in Fluid dynamics for senior undergraduate and postgraduate students in Civil, Environmental, Hydraulic and Mechanical Engineering. It is supported in each chapter by: notes; applications; remarks and discussions. Appendices: * major homework assignments (6x) * glossary * mathematics * description of the 2D Flow + software Finally, the work is further supported by 16 pages of colour plates. Table of Contents: Chapter 1 - Introduction; Chapter 2 - Fundamental Equations; Part I - Irrotational Flow Motion of Ideal Fluid; I-1 Introduction to Ideal Fluid Flows; I-2 Ideal Fluid Flows and Irrotational Flow Motion; I-3 Two-Dimensional Flows (1) Basic equations and flow analogies; I-4 Two-Dimensional Flows (2) Basic flow patterns; I-5 Complex potential, velocity potential & Joukowski transformation; I-6 Joukowski transformation, theorem of Kutta-Joukowski & lift force on airfoil; I-7 Theorem of Schwarz-Christoffel, free streamlines & applications; Part II - Real Fluid Flows: Theory and Applications; II-1 Introduction; II-2 Turbulence: an introduction; II-3 Boundary Layer Theory. Application to Laminar Boundary layer Flows; II-4 Turbulent Boundary layers; Appendices: Appendix A - Constants and Fluid properties; Appendix B -Unit conversions; Appendix C - Mathematics; Appendix D - The software 2D Flow+; Appendix E - Whirlpools in the world; Appendix F - Examples of Civil Engineering structures in the atmospheric boundary layer; Appendix G - Boundary shear stress measurements with Pitot tubes; Assignments: Assignment A - Application to the design of the Alcyone 2; Assignment B - Applications to Civil Design on the Gold Coast; Assignment C - Wind flow past a series of circular buildings; Assignment D - Prototype freighter Testing.
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applied hydrodynamics an introduction to ideal and Real Fluid flows
2009Co-Authors: Hubert ChansonAbstract:Fluid dynamics is the engineering science dealing with forces and energies generated by Fluids in motion. Fluid dynamics and hydro-dynamics play a vital role in everyday life. Practical examples include the flow motion in the kitchen sink, the exhaust fan above the stove, and the air conditioning system in our home. When driving a car, the air flow around the vehicle body induces some drag which increases with the square of the car speed and contributes to excess fuel consumption. Engineering applications encompass: applied hydrodynamics and Fluid transport in pipes and canals, environmental processes and transportation (cars, ships, aircrafts), hydraulic and coastal structures, wind flow around buildings, aerodynamics Fluid circulations in lakes, oceans and atmosphere energy generation, Fluid motion in the human body. This advanced undergraduate and post-graduate textbook deals with the topic of applied hydrodynamics. The lecture material is grouped into two complementary sections: ideal Fluid flow and Real Fluid flow. The former deals with two- and possibly three-dimensional Fluid motions that are not subject to boundary friction effects, while the latter considers the flow regions affected by boundary friction and turbulent shear. The lecture material is designed as an intermediate course in Fluid dynamics for senior undergraduate and postgraduate students in Civil, Environmental, Hydraulic and Mechanical Engineering. It is supported in each chapter by: notes; applications; remarks and discussions. Appendices: * major homework assignments (6x) * glossary * mathematics * description of the 2D Flow + software Finally, the work is further supported by 16 pages of colour plates. Table of Contents: Chapter 1 - Introduction; Chapter 2 - Fundamental Equations; Part I - Irrotational Flow Motion of Ideal Fluid; I-1 Introduction to Ideal Fluid Flows; I-2 Ideal Fluid Flows and Irrotational Flow Motion; I-3 Two-Dimensional Flows (1) Basic equations and flow analogies; I-4 Two-Dimensional Flows (2) Basic flow patterns; I-5 Complex potential, velocity potential & Joukowski transformation; I-6 Joukowski transformation, theorem of Kutta-Joukowski & lift force on airfoil; I-7 Theorem of Schwarz-Christoffel, free streamlines & applications; Part II - Real Fluid Flows: Theory and Applications; II-1 Introduction; II-2 Turbulence: an introduction; II-3 Boundary Layer Theory. Application to Laminar Boundary layer Flows; II-4 Turbulent Boundary layers; Appendices: Appendix A - Constants and Fluid properties; Appendix B -Unit conversions; Appendix C - Mathematics; Appendix D - The software 2D Flow+; Appendix E - Whirlpools in the world; Appendix F - Examples of Civil Engineering structures in the atmospheric boundary layer; Appendix G - Boundary shear stress measurements with Pitot tubes; Assignments: Assignment A - Application to the design of the Alcyone 2; Assignment B - Applications to Civil Design on the Gold Coast; Assignment C - Wind flow past a series of circular buildings; Assignment D - Prototype freighter Testing.
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undergraduate teaching of ideal and Real Fluid flows the value of Real world experimental projects
Annals of Research in Engineering Education (AREE), 2007Co-Authors: Tom E Baldock, Hubert ChansonAbstract:This study describes the pedagogical impact of Real-world experimental projects undertaken as part of an advanced undergraduate Fluid Mechanics subject at an Australian university. The projects have been organised to complement traditional lectures and introduce students to the challenges of professional design, physical modelling, data collection and analysis. The physical model studies combine experimental, analytical and numerical work in order to develop students’ abilities to tackle Real-world problems. A first study illustrates the differences between ideal and Real Fluid flow force predictions based upon model tests of buildings in a large size wind tunnel used for research and professional testing. A second study introduces the complexity arising from unsteady non-uniform wave loading on a sheltered pile. The teaching initiative is supported by feedback from undergraduate students. The pedagogy of the course and projects is discussed with reference to experiential, project-based and collaborative learning. The practical work complements traditional lectures and tutorials, and provides opportunities which cannot be learnt in the classroom, Real or virtual. Student feedback demonstrates a strong interest for the project phases of the course. This was associated with greater motivation for the course, leading in turn to lower failure rates. In terms of learning outcomes, the primary aim is to enable students to deliver a professional report as the final product, where physical model data are compared to ideal-Fluid flow calculations and Real-Fluid flow analyses. Thus the students are exposed to a professional design approach involving a high level of expertise in Fluid mechanics, with sufficient academic guidance to achieve carefully defined learning goals, while retaining sufficient flexibility for students to construct there own learning goals. The overall pedagogy is a blend of problem-based and project-based learning, which reflects academic research and professional practice. The assessment is a mix of peer-assessed oral presentations and written reports that aims to maximise student reflection and development. Student feedback indicated a strong motivation for courses that include a well-designed project component.
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undergraduate teaching of ideal and Real Fluid flows the value of Real world experimental projects
European Journal of Engineering Education, 2006Co-Authors: Tom E Baldock, Hubert ChansonAbstract:This paper describes the pedagogical impact of Real-world experimental projects undertaken as part of an advanced undergraduate Fluid mechanics subject at an Australian university. The projects have been organized to complement traditional lectures and introduce students to the challenges of professional design, physical modelling, data collection and analysis. An overview of two projects is presented: wind tunnel testing of buildings and wave loading on piles. Both studies are undertaken as group work within the undergraduate subject. The pedagogy of the projects is discussed in terms of the classical educational psychology literature concerning project-based learning, collaborative and guided learning and reflection. In terms of learning outcomes, the primary aim is to enable students to deliver a professional report as the final product, where physical model data are compared to ideal-Fluid flow calculations and Real-Fluid flow analyses. Thus the students are exposed to a professional design approach involving a high level of expertise in Fluid mechanics, with sufficient academic guidance to achieve carefully defined learning goals, while retaining sufficient flexibility for students to construct their own learning goals. The overall pedagogy is a blend of problem-based and project-based learning, which reflects academic research and professional practice. The assessment is a mix of peer-assessed oral presentations and written reports that aims to maximize student reflection and development. Student feedback indicated a strong motivation for courses that include a well-designed project component.
