Aerodynamic Optimization for the Subsonic S- Shaped Diffuser

Aerodynamic Optimization for the Subsonic S- Shaped...

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American Institute of Aeronautics and Astronautics 1 Aerodynamic Optimization for the Subsonic S- Shaped Diffuser Using Two-Equation Turbulence Models Byung Joon Lee, Chongam Kim * and Oh-Hyun Rho * AIAA Member AIAA Associate Fellow Department of Aerospace engineering, Seoul National University, 151-744, Seoul, Korea ` Abstract A parallelized design optimization approach is pre- sented for a subsonic S-shaped inlet using aerody- namic sensitivity analysis. Two-equation turbulence model is adopted to predict the strong counter vortices in the S-shaped duct more precisely. Sensitivity analy- sis is performed for the three-dimensional Navier- Stokes equations coupled with two-equation turbu- lence models using a discrete adjoint method. For code validation, the result of the flow solver is com- pared with experiment data and bench marking data of other computation researches. To study the influence of turbulence models and grid refinement in the duct flow analysis, the results using several turbulence models are compared with each other on various grid systems. The adjoint variable code is validated by comparison with the finite difference results. The ca- pability and the efficiency of the present design tools
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This note was uploaded on 12/12/2010 for the course DS 519 taught by Professor Saeedbehfarsh during the Spring '10 term at Coleman.

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