AMG coarsening halted - Star CCM+

While running a CFD, i got this error at 10th iteration

WARNING: Ap = 0 on multigrid level X, nRows = XX, blockSize = X
         AMG coarsening halted.

This is due to small un conected surfaces in mesh
To rectify this right click and select repair surface in Representation >> remeshed surface, which you can find below plots

A new window called Surface Prepration Options will pop up. Click OK

In the side pane, select mode as "Edit conected surfaces" from the drop down and click start diagonosis

it will display more than one line of surface groups in a table.
Highlight and delete the small unconnected surfaces and close the window.

Select generate volume mesh to remesh

5 comments:

  1. Great! That was very helpful.
    Thanks!

    ReplyDelete
  2. I will try that to see if works or not. Thanks.

    ReplyDelete
  3. I have tried clicking on Automated Mesh.Remesh underneath Representations >> Geometry, but I do not get any option to select surface repair.

    ReplyDelete
  4. Hello,

    Thank You very much for the solution. But what do you think might be the effect on the solution if we continue the simulation by neglecting this warning. My simulation is showing this as a warning, but is still running.

    ReplyDelete
  5. Hi I got the same error massage.
    Besides Starccm+ works well although the error occurs. I wounder if the flow field is ok. Have any ideas?

    ReplyDelete