非定常乱流に対するRANS計算に関する研究 : 周期的吹出し・吸込みを伴うバックスチップ流の場合(<小特集>乱流研究の最前線)

概要

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With improving a computer hardware and CFD software, the problems treated in industries tend to be more complex, physically and geometrically. The turbulent flow with strong unsteadiness is one of physically complex examples. Since Large Eddy Simulation (LES) is still too time-consuming, a great number of unsteady Reynolds-Averaged Navier-Stokes (RANS) computations have been employed in such engineering applications. However, the applicability of RANS to unsteady flows has not been clear. In the present study, RANS computations for two-dimensional turbulent flow with periodic perturbation over a backward-facing step are performed to verify the performance of a low-Reynolds-number type k-ε turbulence model. Visualizing and investigating the temporal change of the flow pattern and the instantaneous term-by-term budget of the governing equations, it is clarified that the RANS computation can reproduce the unsteady nature satisfactorily, and why the RANS model captures the unsteady turbulent flow reasonably.
社団法人日本機械学会の論文
2006-12-25