A ghost-cell immersed boundary method for large eddy simulation of flows in complex geometries
A ghost-cell immersed boundary method for large eddy simulation of flows in complex geometries
复制标题
DOI：
10.1080/10618562.2014.1002484
复制
发表时间：
2015-01
影响因子：
1.3
通讯作者：
Chao Yan;Weixi Huang;G. Cui;Chunxiao Xu;Zhao-shun Zhang
中科院分区：
文献类型：
--
作者：
Chao Yan;Weixi Huang;G. Cui;Chunxiao Xu;Zhao-shun Zhang
提出了一种有效的鬼胞浸入边界法，用于复杂几何形状下三维不可压缩流的大涡模拟。在有限体积法的框架下，采用显式时间推进法在配置网格上对Navier-Stokes方程进行积分。由于已知IB方法会在IB内部产生非物理速度场，违反IB附近细胞的质量守恒，因此设计了一种新的IB处理方法来消除IB附近产生的非物理速度，并改善体表压力分布。为了验证所提出的方法，给出了层流和湍流两种情况。在亚临界雷诺数条件下，对圆柱和球面上的湍流进行了大涡模拟。计算结果与已发表的数值和实验数据吻合较好。
An efficient ghost-cell immersed boundary (IB) method is proposed for large eddy simulations of three-dimensional incompressible flow in complex geometries. In the framework of finite volume method, the Navier–Stokes equations are integrated using an explicit time advancement scheme on a collocated mesh. Since the IB method is known to generate an unphysical velocity field inside the IB that violates the mass conservation of the cells near the IB, a new IB treatment is devised to eliminate the unphysical velocity generated near the IB and to improve the pressure distribution on the body surface. To validate the proposed method, both laminar and turbulent flow cases are presented. In particular, large eddy simulations were performed to simulate the turbulent flows over a circular cylinder and a sphere at subcritical Reynolds numbers. The computed results show good agreements with the published numerical and experimental data.