Coarse mesh for TGV at Re=1600

General
1

Hi, everyone!

When I use p7 FR-DG scheme to simulate TGV at Ma=0.1 with a 16^3 mesh, it diverge due to the aliasing error as mentioned in Ref (Bull J R, Jameson A. Simulation of the Taylor–Green vortex using high-order flux reconstruction schemes[J]. AIAA Journal, 2015, 53(9): 2750-2761.). However, when I further reduce mesh number to 14^3, it do not diverge. How can explain?

2

This is not entirely unexpected. Coarser grids are less capable of resolving smaller scales. This, in turn, can impact how aliasing-driven instabilities develop.

Regards, Freddie.