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Algebraic Turbulence Model

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Andrea Arnone – One of the best experts on this subject based on the ideXlab platform.

  • Transition Modeling Effects on Turbine Rotor Blade Heat Transfer Predictions
    Journal of Turbomachinery, 1996
    Co-Authors: Ali Ameri, Andrea Arnone
    Abstract:

    The effect of transition Modeling on the heat transfer predictions from rotating turbine blades was investigated. Three-dimensional computations using a Reynolds-averaged Navier-Stokes code were performed. The code utilized the Baldwin-Lomax Algebraic Turbulence Model, which was supplemented with a simple Algebraic Model for transition. The heat transfer results obtained on the blade surface and the hub endwall were compared with experimental data for two Reynolds numbers and their corresponding rotational speeds. The prediction of heat transfer on the blade surfaces was found to improve with the inclusion of the transition length Model and wake-induced transition effects over the simple abrupt transition Model.

  • Numerical investigation on wake shedding in a turbine rotor blade
    Fifteenth International Conference on Numerical Methods in Fluid Dynamics, 1
    Co-Authors: Andrea Arnone, Roberto Pacciani
    Abstract:

    A recently developed, time-accurate multigrid solver has been applied to investigate the capability of predicting trailing edge vortex shedding by means of the Reynolds-Averaged Navier-Stokes equations and an Algebraic Turbulence Model. Calculations using a mixing-length based Model for Turbulence closure indicate the inception of shedding even on relatively coarse trailing edge grids.

Jan Stebel – One of the best experts on this subject based on the ideXlab platform.

Ali Ameri – One of the best experts on this subject based on the ideXlab platform.

  • TRAF3D.MM – A multi-block flow solver for turbomachinery flows
    35th Aerospace Sciences Meeting and Exhibit, 1997
    Co-Authors: Erlendur Steinthorsson, Ali Ameri, David L. Rigby
    Abstract:

    An overview of a methodology for simulating steady flow and heat transfer in turbomachinery is presented. The methodology is the basis for a computer code called TRAF3D.MB. The objective behind the development of the methodology and the computer code is to improve the capability to predict heat transfer in turbomachinery flows. The computer code is used to study turbomachinery flows and to test Turbulence Models in the prediction of turbomachinery flows. Key aspects of the methodology are (a) multi block grid systems for complicated geometries, (b) finite volume discretization and (c) multigrid convergence acceleration. A target has also been to make the computer code modular, for example to allow flexibility in implementing and testing Turbulence Models. Currently two Turbulence Model have been implemented, an Algebraic Turbulence Model and a two equation (k-co) Turbulence Model. Sample results are presented.

  • Transition Modeling Effects on Turbine Rotor Blade Heat Transfer Predictions
    Journal of Turbomachinery, 1996
    Co-Authors: Ali Ameri, Andrea Arnone
    Abstract:

    The effect of transition Modeling on the heat transfer predictions from rotating turbine blades was investigated. Three-dimensional computations using a Reynolds-averaged Navier-Stokes code were performed. The code utilized the Baldwin-Lomax Algebraic Turbulence Model, which was supplemented with a simple Algebraic Model for transition. The heat transfer results obtained on the blade surface and the hub endwall were compared with experimental data for two Reynolds numbers and their corresponding rotational speeds. The prediction of heat transfer on the blade surfaces was found to improve with the inclusion of the transition length Model and wake-induced transition effects over the simple abrupt transition Model.

S. K. Chakrabartty – One of the best experts on this subject based on the ideXlab platform.

  • Navier-Stokes analysis of vortex flow over a cropped delta wing
    Acta Mechanica, 1998
    Co-Authors: S. K. Chakrabartty, K Dhanalakshmi, J. S. Mathur
    Abstract:

    The vortex flow over a 65° cropped delta wing with round leading edge, at M _∞=0.85 and Re_∞=2.38×10^6, has been analyzed for 10°, 20°, and 30° angles of attack. A vertex based finite volume code, JUMBO3D, with an Algebraic Turbulence Model has been used to solve the Reynolds Averaged Navier-Stokes (RANS) equations. An H−O type grid generated by a hybrid elliptic-Algebraic method has been used here, and a significant improvement of the results over an O−O type grid has been obtained. The results are compared with available experimental data. The complex physical phenomena due to interactions among the primary, secondary, and tertiary vortices, cross-flow and terminating shocks, and turbulent bounboundary layer, as visualized from the numerical solutions obtained are presented and discussed here.

  • Navier-Stokes analysis of Korn aerofoil
    Acta Mechanica, 1996
    Co-Authors: S. K. Chakrabartty, K Dhanalakshmi
    Abstract:

    Two-dimensional Reynolds-averaged Navier-Stokes equations with Algebraic Turbulence Model have been solved using a vertex-based finite-volume space discretization and an explicit five-stage Runge-Kutta time steps. A modified artificial dissipation based on the time-step limit for convective and diffusive equation has been used for numerical stability. The off-design behaviour of the supercritical Korn aerofoil in viscous transonic flow has been considered a good test case because the numerical scheme needs more accuracy to predict the appearance of double shocks. Results have been compared with experiments and the general behaviour of the aerofoil has been studied.

  • Computation of three-dimensional transonic viscous flow using the JUMB03D code
    Acta Mechanica, 1996
    Co-Authors: S. K. Chakrabartty, K Dhanalakshmi, J. S. Mathur
    Abstract:

    A vertex based finite volume method for the solution of the three dimensional Reynolds averaged Navier-Stokes equations has been developed. The computations can be carried out blockwise after dividing the computational domain into smaller blocks to reduce the memory requirement for a single processor computer and also to facilitate parallel computing. A five stage Runge-Kutta scheme has been used to advance the solution in time. Enthalpy damping, implicit residual smoothing, local time stepping, and grid sequencing are used for convergence acceleration. In order to get smooth convergence for transonic, viscous flows, the artificial dissipation has been modified by using the time step for advective and diffusive equations. An Algebraic Turbulence Model has been used to determine the turbulent eddy viscosity. The method has been used to compute transonic flow over a cropped delta wing and the ONERA M-6 wing, and subsonic flow over a launch vehicle configuration. The results obtained show good agreement with available experimental data.

Jaroslav Haslinger – One of the best experts on this subject based on the ideXlab platform.

  • Shape Optimization for Navier–Stokes Equations with Algebraic Turbulence Model: Numerical Analysis and Computation
    Applied Mathematics & Optimization, 2011
    Co-Authors: Jaroslav Haslinger, Jan Stebel
    Abstract:

    We study the shape optimization problem for the paper machine headbox which distributes a mixture of water and wood fibers in the paper making process. The aim is to find a shape which a priori ensures the given velocity profile on the outlet part. The mathematical formulation leads to the optimal control problem in which the control variable is the shape of the domain representing the header, the state problem is represented by the generalized Navier-Stokes system with nontrivial boundary conditions. This paper deals with numerical aspects of the problem.

  • shape optimization for navier stokes equations with Algebraic Turbulence Model numerical analysis and computation
    Applied Mathematics and Optimization, 2011
    Co-Authors: Jaroslav Haslinger, Jan Stebel
    Abstract:

    We study the shape optimization problem for the paper machine headbox which distributes a mixture of water and wood fibers in the paper making process. The aim is to find a shape which a priori ensures the given velocity profile on the outlet part. The mathematical formulation leads to the optimal control problem in which the control variable is the shape of the domain representing the header, the state problem is represented by the generalized Navier-Stokes system with nontrivial boundary conditions. This paper deals with numerical aspects of the problem.

  • Shape Optimization for Navier–Stokes Equations with Algebraic Turbulence Model: Numerical Analysis and Computation
    Applied Mathematics & Optimization, 2010
    Co-Authors: Jaroslav Haslinger, Jan Stebel
    Abstract:

    We study the shape optimization problem for the paper machine headbox which distributes a mixture of water and wood fibers in the paper making process. The aim is to find a shape which a priori ensures the given velocity profile on the outlet part. The mathematical formulation leads to the optimal control problem in which the control variable is the shape of the domain representing the header, the state problem is represented by the generalized Navier-Stokes system with nontrivial boundary conditions. This paper deals with numerical aspects of the problem.