국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	A PARALLEL, FINITE-VOLUME ALGORITHM FOR LARGE-EDDY SIMULATION OF TURBULENT FLOWS
저자	Trong T. Bui
Keyword	Finite-volume; Large-eddy simulation; Parallel computers; Turbulence; Upwindmethods
URL	http://www.dfrc.nasa.gov/DTRS/1999/PDF/H-2285.pdf
보고서번호	NASA-TM-1999-206570
발행년도	1999
출처	NASA Dryden Flight Research Center
ABSTRACT	A parallel, finite-volume algorithm has been developed for large-eddy simulation (LES) of compressible turbulent flows. This algorithm includes piecewise linear least-square reconstruction, trilinear finite-element interpolation, Roe flux-difference splitting, and second-order MacCormack time marching. Parallel implementation is done using the message-passing programming model. In this paper, the numerical algorithm is described. To validate the numerical method for turbulence simulation, LES of fully developed turbulent flow in a square duct is performed for a Reynolds number of 320 based on the average friction velocity and the hydraulic diameter of the duct. Direct numerical simulation (DNS) results are available for this test case, and the accuracy of this algorithm for turbulence simulations can be ascertained by comparing the LES solutions with the DNS results. The effects of grid resolution, upwind numerical dissipation, and subgrid-scale dissipation on the accuracy of the LES are examined. Comparison with DNS results shows that the standard Roe flux-difference splitting dissipation adversely affects the accuracy of the turbulence simulation. For accurate turbulence simulations, only 3? percent of the standard Roe flux-difference splitting dissipation is needed.