Multigrid convergence of inviscid fixed- and rotary-wing flows

W. B. Tsai, Wen-Wei Lin, C. C. Chieng

研究成果: Article

58 引文 斯高帕斯(Scopus)

摘要

The affect of multigrid acceleration implemented within an upwind-biased Euler method is presented, and applied to fixed-wing and rotary-wing flows. The convergence of fixed- and rotary-wing computations is shown to be vastly different, and multigrid is shown to be less effective for rotary-wing flows. The flow about a hovering rotor suffers from very slow convergence of the inner blade region, where the flow is effectively incompressible. Furthermore, the vortical wake must develop over several turns before convergence is achieved, whereas for fixed-wing computations the far-field grid and solution have little significance. Results are presented for single mesh and two, three, four, and five level multigrid, and using five levels a reduction in required CPU time of over 80 per cent is demonstrated for rotary-wing computations, but 94 per cent for fixed-wing computations. It is found that a simple V-cycle is the most effective, smoothing in the decreasing mesh density direction only, with a relaxed trilinear prolongation operator.

原文English
頁(從 - 到)121-140
頁數20
期刊International Journal for Numerical Methods in Fluids
39
發行號2
DOIs
出版狀態Published - 20 五月 2002

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