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Error : problem setting up multigrid

Posted Dec 25, 2011, 11:01 p.m. EST Version 4.2 1 Reply

JiYoung Park
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Hi,

I am using conjugate heat transfer module(laminar)

There are two parts in my geometry

1. heat generating solid

2. air

I want to simulate 3d natural convection of air due to heat generating solid

But i got error message "problem setting up multigrid"

Can you help?
1 Reply Last Post Dec 26, 2011, 10:49 a.m. EST
Amir Fadel
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Posted: 1 decade ago Dec 26, 2011, 10:49 a.m. EST
Hi,

Most likely you need to decrease the coarsening factor of the multigrid, it is set to 2 as a standard. You need to lower the value until the coarser mesh does not give you problem.
Be careful BEFORE re-running the multigrid you need o manually delete the temporary meshes Comsol created otherwise it will still give you error.

Cheers
Hi, Most likely you need to decrease the coarsening factor of the multigrid, it is set to 2 as a standard. You need to lower the value until the coarser mesh does not give you problem. Be careful BEFORE re-running the multigrid you need o manually delete the temporary meshes Comsol created otherwise it will still give you error. Cheers

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