Turbulent compressible flows in a porous chamber with surface transpiration have been analyzed numerically. Large-eddy-simulation technique is used to study the flow evolution within the chamber. The formulation treats the spatially filtered, Favre-averaged conservation equations of mass, momentum, and energy for compressible flows. The contribution of the large energy-carrying structures to momentum and energy transfer is computed exactly, and the effect of small-scales of turbulence is modeled using dynamic subgrid-scale model. The governing equations and the associated boundary conditions are numerically solved by means of a fĩnite-volume-technique using fourth-order Runge-Kutta scheme with domain decomposition and parallel processing. The evolution of vorticity field within the chamber indicates three successive regimes of flow development: the laminar, transition, and fully turbulent flow, respectively. Results show good comparison for the mean pressure and velocity profiles with the experimental data. The flowfield is dominated by strain rates in the axial direction resulting in higher turbulence intensity in the axial component compared with the vertical and spanwise direction. The present three-dimensional simulation predicts the turbulence intensity and Reynolds stress levels fairly accurately as compared with earlier work. The importance of vortex-stretching phenomenon to accurately capture the dissipation and production rates in a turbulent flowfield is elucidated in the present work.
|出版狀態||Published - 2000|
|事件||38th Aerospace Sciences Meeting and Exhibit 2000 - Reno, NV, United States|
持續時間: 2000 1月 10 → 2000 1月 13
|Other||38th Aerospace Sciences Meeting and Exhibit 2000|
|期間||00-01-10 → 00-01-13|
All Science Journal Classification (ASJC) codes