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首页> 外文期刊>Journal of Computational Physics >IMPLICIT/MULTIGRID ALGORITHMS FOR INCOMPRESSIBLE TURBULENT FLOWS ON UNSTRUCTURED GRIDS
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IMPLICIT/MULTIGRID ALGORITHMS FOR INCOMPRESSIBLE TURBULENT FLOWS ON UNSTRUCTURED GRIDS

机译：非结构网格上不可压缩湍流的隐式/多重网格算法

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An implicit code for computing inviscid and viscous incompressible flows on unstructured grids is described. The foundation of the code is a backward Euler time discretization for which the linear system is approximately solved at each time step with either a point implicit method or a preconditioned generalized minimal residual (GMRES) technique. For the GMRES calculations, several techniques are investigated for forming the matrix-vector product. Convergence acceleration is achieved through a multigrid scheme that uses nonnested coarse grids that are generated using a technique described in the present paper. Convergence characteristics are investigated and results are compared with an exact solution for the inviscid flow over a four-element airfoil. Viscous results, which are compared with experimental data, include the turbulent flow over a NACA 4412 airfoil, a three-element airfoil for which Mach number effects are investigated, and three-dimensional flow over a wing with a partial-span flap. (C) 1996 Academic Press, Inc. [References: 56]
机译：描述了一种隐式代码，用于计算非结构化网格上的粘性和不可压缩流。代码的基础是向后的Euler时间离散化，对于线性离散化，可以在每个时间步使用点隐式方法或预处理的广义最小残差（GMRES）技术来近似求解线性系统。对于GMRES计算，研究了几种形成矩阵向量乘积的技术。通过使用非嵌套粗网格的多网格方案可以实现收敛加速，该非嵌套粗网格是使用本文中介绍的技术生成的。研究了收敛特性，并将结果与​​四元翼型上无粘性流的精确解进行了比较。粘性结果与实验数据进行了比较，其中包括流过NACA 4412机翼的湍流，研究了马赫数效应的三元翼型以及带有部分跨度襟翼的机翼的三维流。 （C）1996 Academic Press，Inc. [参考：56]

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