Efficient Immersed Boundary Method for Strong Interaction Problem of Arbitrary Shape Object with the Self-Induced Flow
Efficient Immersed Boundary Method for Strong Interaction Problem of Arbitrary Shape Object with the Self-Induced Flow
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DOI：
10.1299/jfst.2.1
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发表时间：
2007
影响因子：
0.8
通讯作者：
Y. Yuki;S. Takeuchi;T. Kajishima
中科院分区：
文献类型：
--
作者：
Y. Yuki;S. Takeuchi;T. Kajishima
本文改进了浸入边界法，并将其应用于含单个静止/运动物体的二维流场。本文提出的浸入边界法采用与固体体积分数成正比的体积力来耦合界面处的固体和流体运动。本文提出了一种新的双曲正切函数作为计算界面单元体积分数的表面数字化器，并证明了这种改进对涉及任意形状物体的问题是有效的。本文将该方法应用于圆柱绕流场和流体与自由落体的相互作用问题。计算结果与作者采用不同方法所得结果及文献报道的结果一致。通过对浸入边界法的一系列改进，使计算时间大大缩短。
An immersed boundary method is improved and applied to 2-D flow fields involving a single stationary/moving object. The present immersed boundary method employs a body force proportional to a solid volume fraction for coupling the solid and fluid motions at the interface. A hyperbolic-tangent function is newly introduced as a surface digitiser for computing the volume fractions at the interface cells, and this improvement is proved to be efficient for problems involving arbitrary shape object. The present method is applied to a uniform flow field around a circular cylinder and an interaction problem of fluid and free-falling object. The computational results are found to agree with the results by the different methods of the present authors and the results reported in the literatures. Also the computation time is considerably cut down compared to the other methods by the series of improvements to the immersed boundary method.