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v4 & AMG warning msg

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Old   December 19, 2007, 05:56
Default v4 & AMG warning msg
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Hi! I'm now running v4 but using trim mesh created in v3. It ran quite well earlier without porous media. However, now in a model containing porous media I got this warning msg below but only after 45 iterations onwards. Kindly someone let me what this warning message means.

45 2.75E-01 1.00E+00 7.00E-01 -- -- -- -- 1.03E+05-6.73E+13 4.40E-01 -- -- -- -- FINISH ITERATION NO. 45 CPU time is 306.86 Elapsed time is 307.11

46 3.82E-01 1.00E+00 2.81E-01 -- -- -- -- 3.04E+05-1.05E+14 6.09E-01 -- -- -- -- FINISH ITERATION NO. 46 CPU time is 311.89 Elapsed time is 312.14 WARNING: Ap = 0 on multigrid level 1, nRows = 49184, blockSize = 1

AMG coarsening halted. WARNING: Ap = 0 on multigrid level 1, nRows = 49974, blockSize = 1

AMG coarsening halted. WARNING: Ap = 0 on multigrid level 1, nRows = 50823, blockSize = 1

AMG coarsening halted.

47 2.92E-01 1.00E+00 6.90E-01 -- -- -- -- 2.73E+05-1.06E+14 1.67E+00 -- -- -- -- FINISH ITERATION NO. 47 CPU time is 400.92 Elapsed time is 401.17 WARNING: Ap = 0 on multigrid level 1, nRows = 49011, blockSize = 1

AMG coarsening halted. WARNING: Ap = 0 on multigrid level 1, nRows = 50353, blockSize = 1

AMG coarsening halted. WARNING: Ap = 0 on multigrid level 1, nRows = 49831, blockSize = 1

AMG coarsening halted.

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Old   March 7, 2012, 00:34
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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
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Old   March 28, 2012, 08:42
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Quote:
Originally Posted by rcm View Post
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
Do we have to regenerate a volume mesh after using 'remove invalid cells in region' ? or it is compulsory just after using surface repair?
Thank you in advance.
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Old   March 28, 2012, 09:56
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yes. generate volume mesh and switch on cell quality remediation
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Old   March 29, 2012, 04:47
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Quote:
Originally Posted by rcm View Post
yes. generate volume mesh and switch on cell quality remediation
Thank you for your answer.

Just a question.After removing some cells by 'remove invalid cells' ,first i did not regenerate volume mesh.So we should expect the residual isn't changed.
but it was changed a lot.
What does it mean?

Thank you in advance.
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