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网格雷诺数定义在每个网格点上,以$x$方向举例: \begin{equation} \mathrm{Re}=\frac{\delta x \rho u}{\mu} \end{equation} 其中$\delta x$表示网格在$x$方向的举例,$u$表示在$x$方向的速度。网格雷诺数可以帮助用户寻找震荡的原因。只有网格雷诺数在一定的值以下,高阶格式的计算结果才能保证稳定。