淡江大學機構典藏:Item 987654321/83727
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    题名: A Simple Incompressible Flux Splitting For Sharp Free Surface Capturing
    作者: Niu, Yang-Yao;Edwards, Jack R.
    贡献者: 淡江大學航空太空工程學系
    关键词: artificial compressibility;AUSM;free surface;interface;LDFSS;multifluid
    日期: 2012-08
    上传时间: 2013-03-20 16:57:04 (UTC+8)
    出版者: Chichester: John Wiley & Sons Ltd.
    摘要: This paper first applies a flux vector-type splitting method based on the numerical speed of sound for computing incompressible single and multifluid flows. Here, a preconditioning matrix based on Chorin's artificial compressibility concept is used to modify the incompressible multifluid Navier–Stokes equations to be hyperbolic and density or volume fraction-independent. The current approach can reduce eigenvalues disparity induced from density or volume fraction ratios and enhance numerical stability. Also, a simple convection-pressure flux-splitting method with high-order essentially nonoscillatory-type primitive variable extrapolations coupled with monotone upstream-centered schemes for conservation laws-type volume fraction recompressed reconstruction is used to maintain the preservation of sharp interface evolutions in multifluid flow simulations. Benchmark tests including a solid rotation test of a notched two-dimensional cylinder, the evolution of spiral and rotational shapes of deformable circles, a dam breaking problem, and the Rayleigh–Taylor instability were chosen to validate the current incompressible multifluid methodology. An incompressible driven cavity was also chosen to check the robustness of the proposed method on the computation of single fluid incompressible flow problems.
    關聯: International Journal for Numerical Methods in Fluids 69(10), pp.1661-1678
    DOI: 10.1002/fld.2658
    显示于类别:[航空太空工程學系暨研究所] 期刊論文

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