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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Meshing issues - boundary layers

Posted 2011年4月23日 GMT-4 22:19 Fluid & Heat, Geometry, Mesh Version 4.1 4 Replies

Matt Medow
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I am trying to model fluid flow up through the inner lumen of a tube, then laterally through pores in the tube wall, and then up through a ring-like channel boardered by said inner tube and another outer tube.

A physics-defined mesh returns "Invalid boundary layer specification" for a seemingly-random inside edge on the outer tube. When I attempt a user-controlled mesh, specifying my own boundary layers, I get the same message. If I fiddle around with different boundaries I receive an "Outer boundary element has wrong number of neighbors."

I'm hoping it is not a problem with how I made my geometry (file is attached). Any ideas?

Thanks so much,

Matt

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4 Replies Last Post 2013年6月7日 GMT-4 12:29
Matt Medow
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Posted: 1 decade ago 2011年4月24日 GMT-4 01:28
Alternatively, here is a 2D version of a slice of what I'm trying to accomplish. Of course I receive an error message when attempting to run a parametric sweep with this model as well:

"Failed to find a solution for all parameters,
even when using the minimum parameter step.
No convergence, even when using the minimum damping factor.
Returned solution has not converged."

If anyone could help me with my 3D model first that would be great. Secondary to that would be help troubleshooting the attached 2D axisymmetric model.

Thanks again,

Matt
Alternatively, here is a 2D version of a slice of what I'm trying to accomplish. Of course I receive an error message when attempting to run a parametric sweep with this model as well: "Failed to find a solution for all parameters, even when using the minimum parameter step. No convergence, even when using the minimum damping factor. Returned solution has not converged." If anyone could help me with my 3D model first that would be great. Secondary to that would be help troubleshooting the attached 2D axisymmetric model. Thanks again, Matt

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Stephen Roff
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Posted: 1 decade ago 2011年6月17日 GMT-4 11:42
Hey Matt,

I'm having a similar issue with my model. Specifically, I'm receiving an identical error: "Invalid boundary layer specification" on a seemingly random edge of my model. I was wondering if you or anyone reading this thread has received this or very similar errors and has found any solutions?

Thanks,

Stephen
Hey Matt, I'm having a similar issue with my model. Specifically, I'm receiving an identical error: "Invalid boundary layer specification" on a seemingly random edge of my model. I was wondering if you or anyone reading this thread has received this or very similar errors and has found any solutions? Thanks, Stephen
Catherine Robin
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Posted: 1 decade ago 2011年7月27日 GMT-4 15:48
I had the same problem (in version 4.2), but it cleared up when I made the mesh coarser (didn't try making it finer).

Catherine
I had the same problem (in version 4.2), but it cleared up when I made the mesh coarser (didn't try making it finer). Catherine
Mark Schulte
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Posted: 1 decade ago 2013年6月7日 GMT-4 12:29
I also had luck in a similar system by deleting the mesh and making a "mapped" mesh instead.
I also had luck in a similar system by deleting the mesh and making a "mapped" mesh instead.

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