Non smooth discontinuties contour solution at grid size transistion region -- CFD Online Discussion Forums

March 15, 2023, 23:19

Non smooth discontinuties contour solution at grid size transistion region

quarkz

Senior Member

TWB

Join Date: Mar 2009

Posts: 414

Rep Power: 19

Hi,

I'm trying to simulate a 2D flow past airfoil. The grid is generated by SHM, as attached. Grid size is about 0.9M.

The solver used is pimpleFoam and Re tested are 100 - 10000. The forces reached a reasonable steady state after a while.

However, there are discontinuties in the velocity contours when the grid changes from coarse to fine, as shown.

I have simulated different grids using SHM but I'm not sure why this happens. I tried to increase the grid resolution but the problem is still there.

Can someone enlighten me?

Attached Images

	grid1.jpg (119.0 KB, 4 views)
	grid2.PNG (87.5 KB, 5 views)

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