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Error : problem setting up multigrid

Posted 25.12.2011, 23:01 GMT-5 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 26.12.2011, 10:49 GMT-5
Amir Fadel
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Posted: 1 decade ago 26.12.2011, 10:49 GMT-5
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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