Coarse grids can increase numerical viscosity and smooth out sharp features.
较粗的网格会增大数值黏性,从而把尖锐的特征抹平。
Although the fluid is nearly inviscid, the upwind scheme introduces numerical viscosity that damps small-scale turbulence.
尽管该流体几乎可视为无黏,迎风格式仍会引入数值黏性,进而衰减小尺度湍动。