The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform

Ritske S. Huismans - One of the best experts on this subject based on the ideXlab platform.

  • Three‐dimensional numerical simulations of crustal systems undergoing orogeny and subjected to surface processes
    Geochemistry Geophysics Geosystems, 2014
    Co-Authors: Cedric Thieulot, Philippe Steer, Ritske S. Huismans
    Abstract:

    As several modeling studies indicate, the structural expression and dynamic behavior of orogenic mountain belts are dictated not only by their rheological properties or by far-field tectonic motion, but also by the efficiency of erosion and sedimentation acting on its surface. Until recently, numerical investigations have been mainly limited to 2-D studies because of the high computational cost required by 3-D models. Here, we have efficiently coupled the landscape evolution model Cascade with the 3-D thermomechanically coupled tectonics code FANTOM. Details of the coupling algorithms between both codes are given. We present results of numerical experiments designed to study the response of viscous-plastic crustal materials subjected to convergence and to surface processes including both erosion and sedimentation. In particular, we focus on the equilibration of both the tectonic structures and on the surface morphology of the orogen. We show that increasing the efficiency of fluvial erosion increases the frontal Thrust Angle, which in turn decreases the width of the orogen. In addition, the maximum summit elevation of the orogen during transient evolution is significantly higher in those models showcasing surface processes than those that do not. This illustrates the strong coupling between tectonics and surface processes. We also demonstrate that an along-strike gradient of erosion efficiency can have a major impact upon the landscape morphology and the tectonic structure and deformation of the orogen, in both the across-strike and along-strike directions. Overall, our results suggest that surface processes, by enhancing localization of deformation, can act as a positive forcing to topographic building.

  • Three-dimensional numerical simulations of crustal systems undergoing orogeny and subjected to surface processes
    Geochemistry Geophysics Geosystems, 2014
    Co-Authors: Cedric Thieulot, Philippe Steer, Ritske S. Huismans
    Abstract:

    As several modeling studies indicate, the structural expression and dynamic behavior of oro-genic mountain belts are dictated not only by their rheological properties or by far-field tectonic motion, but also by the efficiency of erosion and sedimentation acting on its surface. Until recently, numerical inves-tigations have been mainly limited to 2-D studies because of the high computational cost required by 3-D models. Here, we have efficiently coupled the landscape evolution model Cascade with the 3-D thermome-chanically coupled tectonics code FANTOM. Details of the coupling algorithms between both codes are given. We present results of numerical experiments designed to study the response of viscous-plastic crustal materials subjected to convergence and to surface processes including both erosion and sedimentation. In particular, we focus on the equilibration of both the tectonic structures and on the surface morphology of the orogen. We show that increasing the efficiency of fluvial erosion increases the frontal Thrust Angle, which in turn decreases the width of the orogen. In addition, the maximum summit elevation of the orogen during transient evolution is significantly higher in those models showcasing surface processes than those that do not. This illustrates the strong coupling between tectonics and surface processes. We also demon-strate that an along-strike gradient of erosion efficiency can have a major impact upon the landscape mor-phology and the tectonic structure and deformation of the orogen, in both the across-strike and along-strike directions. Overall, our results suggest that surface processes, by enhancing localization of deforma-tion, can act as a positive forcing to topographic building.

Cedric Thieulot - One of the best experts on this subject based on the ideXlab platform.

  • Three‐dimensional numerical simulations of crustal systems undergoing orogeny and subjected to surface processes
    Geochemistry Geophysics Geosystems, 2014
    Co-Authors: Cedric Thieulot, Philippe Steer, Ritske S. Huismans
    Abstract:

    As several modeling studies indicate, the structural expression and dynamic behavior of orogenic mountain belts are dictated not only by their rheological properties or by far-field tectonic motion, but also by the efficiency of erosion and sedimentation acting on its surface. Until recently, numerical investigations have been mainly limited to 2-D studies because of the high computational cost required by 3-D models. Here, we have efficiently coupled the landscape evolution model Cascade with the 3-D thermomechanically coupled tectonics code FANTOM. Details of the coupling algorithms between both codes are given. We present results of numerical experiments designed to study the response of viscous-plastic crustal materials subjected to convergence and to surface processes including both erosion and sedimentation. In particular, we focus on the equilibration of both the tectonic structures and on the surface morphology of the orogen. We show that increasing the efficiency of fluvial erosion increases the frontal Thrust Angle, which in turn decreases the width of the orogen. In addition, the maximum summit elevation of the orogen during transient evolution is significantly higher in those models showcasing surface processes than those that do not. This illustrates the strong coupling between tectonics and surface processes. We also demonstrate that an along-strike gradient of erosion efficiency can have a major impact upon the landscape morphology and the tectonic structure and deformation of the orogen, in both the across-strike and along-strike directions. Overall, our results suggest that surface processes, by enhancing localization of deformation, can act as a positive forcing to topographic building.

  • Three-dimensional numerical simulations of crustal systems undergoing orogeny and subjected to surface processes
    Geochemistry Geophysics Geosystems, 2014
    Co-Authors: Cedric Thieulot, Philippe Steer, Ritske S. Huismans
    Abstract:

    As several modeling studies indicate, the structural expression and dynamic behavior of oro-genic mountain belts are dictated not only by their rheological properties or by far-field tectonic motion, but also by the efficiency of erosion and sedimentation acting on its surface. Until recently, numerical inves-tigations have been mainly limited to 2-D studies because of the high computational cost required by 3-D models. Here, we have efficiently coupled the landscape evolution model Cascade with the 3-D thermome-chanically coupled tectonics code FANTOM. Details of the coupling algorithms between both codes are given. We present results of numerical experiments designed to study the response of viscous-plastic crustal materials subjected to convergence and to surface processes including both erosion and sedimentation. In particular, we focus on the equilibration of both the tectonic structures and on the surface morphology of the orogen. We show that increasing the efficiency of fluvial erosion increases the frontal Thrust Angle, which in turn decreases the width of the orogen. In addition, the maximum summit elevation of the orogen during transient evolution is significantly higher in those models showcasing surface processes than those that do not. This illustrates the strong coupling between tectonics and surface processes. We also demon-strate that an along-strike gradient of erosion efficiency can have a major impact upon the landscape mor-phology and the tectonic structure and deformation of the orogen, in both the across-strike and along-strike directions. Overall, our results suggest that surface processes, by enhancing localization of deforma-tion, can act as a positive forcing to topographic building.

Philippe Steer - One of the best experts on this subject based on the ideXlab platform.

  • Three‐dimensional numerical simulations of crustal systems undergoing orogeny and subjected to surface processes
    Geochemistry Geophysics Geosystems, 2014
    Co-Authors: Cedric Thieulot, Philippe Steer, Ritske S. Huismans
    Abstract:

    As several modeling studies indicate, the structural expression and dynamic behavior of orogenic mountain belts are dictated not only by their rheological properties or by far-field tectonic motion, but also by the efficiency of erosion and sedimentation acting on its surface. Until recently, numerical investigations have been mainly limited to 2-D studies because of the high computational cost required by 3-D models. Here, we have efficiently coupled the landscape evolution model Cascade with the 3-D thermomechanically coupled tectonics code FANTOM. Details of the coupling algorithms between both codes are given. We present results of numerical experiments designed to study the response of viscous-plastic crustal materials subjected to convergence and to surface processes including both erosion and sedimentation. In particular, we focus on the equilibration of both the tectonic structures and on the surface morphology of the orogen. We show that increasing the efficiency of fluvial erosion increases the frontal Thrust Angle, which in turn decreases the width of the orogen. In addition, the maximum summit elevation of the orogen during transient evolution is significantly higher in those models showcasing surface processes than those that do not. This illustrates the strong coupling between tectonics and surface processes. We also demonstrate that an along-strike gradient of erosion efficiency can have a major impact upon the landscape morphology and the tectonic structure and deformation of the orogen, in both the across-strike and along-strike directions. Overall, our results suggest that surface processes, by enhancing localization of deformation, can act as a positive forcing to topographic building.

  • Three-dimensional numerical simulations of crustal systems undergoing orogeny and subjected to surface processes
    Geochemistry Geophysics Geosystems, 2014
    Co-Authors: Cedric Thieulot, Philippe Steer, Ritske S. Huismans
    Abstract:

    As several modeling studies indicate, the structural expression and dynamic behavior of oro-genic mountain belts are dictated not only by their rheological properties or by far-field tectonic motion, but also by the efficiency of erosion and sedimentation acting on its surface. Until recently, numerical inves-tigations have been mainly limited to 2-D studies because of the high computational cost required by 3-D models. Here, we have efficiently coupled the landscape evolution model Cascade with the 3-D thermome-chanically coupled tectonics code FANTOM. Details of the coupling algorithms between both codes are given. We present results of numerical experiments designed to study the response of viscous-plastic crustal materials subjected to convergence and to surface processes including both erosion and sedimentation. In particular, we focus on the equilibration of both the tectonic structures and on the surface morphology of the orogen. We show that increasing the efficiency of fluvial erosion increases the frontal Thrust Angle, which in turn decreases the width of the orogen. In addition, the maximum summit elevation of the orogen during transient evolution is significantly higher in those models showcasing surface processes than those that do not. This illustrates the strong coupling between tectonics and surface processes. We also demon-strate that an along-strike gradient of erosion efficiency can have a major impact upon the landscape mor-phology and the tectonic structure and deformation of the orogen, in both the across-strike and along-strike directions. Overall, our results suggest that surface processes, by enhancing localization of deforma-tion, can act as a positive forcing to topographic building.

Li Xia - One of the best experts on this subject based on the ideXlab platform.

  • Calculations of Thrust and Torque for Scarfed Nozzles
    Journal of Shanghai University of Electric Power, 2007
    Co-Authors: Li Xia
    Abstract:

    The scarfed nozzle is used in engines which can produce reversal Thrust,or to produce revolving torque on turbine rocket engines at high speed.Researching for the laval scarfed nozzle,the theoretical calculation on Thrusts and their coefficients,Thrust Angle,torque for the model are made,and their theoretical equations and their dimensionless values with different ψ and θ are achieved.These conclusions with analyses and comparisons will benefit the research on the performance calculations of scarfed nozzle and its initial theoretical design.

Antonio Dumas - One of the best experts on this subject based on the ideXlab platform.

  • Computational Fluid Dynamic Study on a Novel Propulsive System: ACHEON and Its Integration with an Unmanned Aerial Vehicle (UAV)
    Journal of Aerospace Engineering, 2016
    Co-Authors: Shyam Das, Jose Pascoa, Michele Trancossi, Antonio Dumas
    Abstract:

    AbstractIn the present paper, numerical investigations are carried out in a newly proposed propulsive system Aerial Coanda high-efficiency orienting jet nozzle (ACHEON), which supports Thrust vectoring and its application to prototype unmanned aerial vehicles (UAVs). The ACHEON system is presently being proposed for propelling a new vertical and short takeoff (V/STOL) airplane in the European Union. This system is powered by two axial electric turbofans and uses the Coanda effect (attachment of the jet to a curved surface) to achieve precise control of the Thrust Angle. The present study investigates the Thrust vectoring efficiency of this newly patented nozzle and its integration with UAV aircraft. This study numerically investigates the 3D effects on this new machine and proposes remedies to solve the associated problems. Further, swirling effects generated by electric turbofans were studied in great detail. The effect of uniform and nonuniform velocity profiles were investigated on Thrust vectoring eff...

  • Exit Flow Vector Control on a Coanda Nozzle Using Dielectric Barrier Discharge Actuator
    Volume 1: Advances in Aerospace Technology, 2014
    Co-Authors: Jose Pascoa, F. F. Rodrigues, Shyam Das, M. Abdollahzadeh, Antonio Dumas, Michele Trancossi, Maharshi Subhash
    Abstract:

    The paper presents a study on a Coanda nozzle with applications in vectorized propulsion. The nozzle is able to change the exist flow Angle as a function of a differential two-stream incoming flow rate. Herein we demonstrate that by using Dielectric Barrier Discharge actuators we are able to extend the range of attainable exit flow Angles. First the analysis is performed using a numerical approach; afterwards an experimental facility is implemented to study this same effect. We include a comparison between the experimental testing on the Coanda Thruster and CFD computations. Following an analysis of the results we demonstrate that it is possible to achieve a higher exit Thrust Angle, with the DBD plasma actuators active, and this is shown to be important in order to be able to keep the desired Angles under several swirl velocities incoming from the feeding turbofans.© 2014 ASME