Evaluation of numerical diffusion effects in viscous flow calculations
Evaluation of numerical diffusion effects in viscous flow calculations
复制标题
粘性流计算中数值扩散效应的评估
DOI：
10.1016/0045-7930(94)90034-5
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
J. McGuirk
中科院分区：
文献类型：
--
作者：
P. Tattersall;J. McGuirk
本文描述了一种估算雷诺平均Navier-Stokes方程（RANS）解中数值扩散量的方法。该方法证明，特别是对于那些RANS算法，实现数值稳定的直接增加数值平滑项。结果显示绕翼型层流，网格质量和某些算法参数的影响进行了研究。结果表明，在这种情况下，数值扩散的估计可以成功地用于指导自动网格自适应。一些功能和影响的结果，如数值平滑算法的有效性和其形式的适当性，进行了讨论和相关的其他工作。一般情况下，特别是需要一个改进形式的数值平滑算法的一些影响，推断。
A method for estimating the amount of numerical diffusion present in a solution of the Reynolds-averaged Navier-Stokes (RANS) equations is described. The method is demonstrated in particular for those RANS algorithms which achieve numerical stability by the direct addition of numerical smoothing terms. Results are shown for laminar flow around an aerofoil, with effects of grid quality and certain algorithm parameters investigated. It is shown that the estimate of the numerical diffusion can be successfully used to guide automatic grid adaptation in this case. Some features and implications of the results, such as the effectiveness of the numerical smoothing algorithm and the appropriateness of its form, are discussed and related to other work. Some implications for general cases, particularly the need for an improved form of the numerical smoothing algorithm, are inferred.