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Error - 3D LID Driven Cavity Flow

Posted Apr 3, 2012, 10:58 a.m. EDT Fluid & Heat, Computational Fluid Dynamics (CFD), Studies & Solvers Version 4.2a 5 Replies

StudentDK
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Hello Forum,

i try a computation for the "3D lid-driven cavity flow" model.

I got a Comsol Error:
Failed to find a solution.
Divergence of the linear iterations.
Returned solution is not converged.

I have attached a link where you can download my model.
www.file-upload.net/download-4236908/lid-drivenCavity3D.mph.html

Hope somebody can help me. Thank you in advance!

Best regards!
5 Replies Last Post Dec 10, 2013, 12:30 p.m. EST
Amir Fadel
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Posted: 1 decade ago Apr 4, 2012, 4:24 a.m. EDT
Hi,

You need two things: add a pressure constraint point, use inconsistent stabilization.

Cheers
Hi, You need two things: add a pressure constraint point, use inconsistent stabilization. Cheers
StudentDK
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Posted: 1 decade ago Apr 4, 2012, 2:10 p.m. EDT

Hi,

You need two things: add a pressure constraint point, use inconsistent stabilization.

Cheers


Thank you very much!
[QUOTE] Hi, You need two things: add a pressure constraint point, use inconsistent stabilization. Cheers [/QUOTE] Thank you very much!
Jonathan Kobine
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Posted: 1 decade ago Nov 27, 2013, 11:30 a.m. EST
Hello,

I was very interested to see your model "lid-drivenCavity3D AF.mph" that you posted so helpfully on this thread. I am currently trying to build a 3D driven-cavity model in order to understand how COMSOL Multiphysics operates in a 3D geometry. My question is rather basic:

How did you enter the value of 0.3 m/s for the sliding-wall boundary condition on boundary #4?

I have been trying to build a model exactly like yours, with a solid 3D block and an added wall condition set to 'Sliding wall'. I get the table of velocity components (all set to zero initially) but when I try clicking on the table to change a value of a velocity component I always get an 'unexpected error occurred' box coming up on the screen. I cannot see any other way of changes these values.

I am using Comsol 4.2a on a Mac running OS 10.9. It looks like the attached screenshot on my computer.

Any help most gratefully received.

Thanks,
JK
Hello, I was very interested to see your model "lid-drivenCavity3D AF.mph" that you posted so helpfully on this thread. I am currently trying to build a 3D driven-cavity model in order to understand how COMSOL Multiphysics operates in a 3D geometry. My question is rather basic: How did you enter the value of 0.3 m/s for the sliding-wall boundary condition on boundary #4? I have been trying to build a model exactly like yours, with a solid 3D block and an added wall condition set to 'Sliding wall'. I get the table of velocity components (all set to zero initially) but when I try clicking on the table to change a value of a velocity component I always get an 'unexpected error occurred' box coming up on the screen. I cannot see any other way of changes these values. I am using Comsol 4.2a on a Mac running OS 10.9. It looks like the attached screenshot on my computer. Any help most gratefully received. Thanks, JK
Amir Fadel
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Posted: 1 decade ago Nov 28, 2013, 4:31 a.m. EST
Hi,

I directly input any value I want in the box of the boundary condition. If you get the 'unexpected error', I would say you may have issues with your geometry. I usually receive such an error when something goes wrong in comsol with complicated geometries.

Have you started the model from scratch? There may also be compatibility issues between 4.3 and 4.2.

Cheers

Hi, I directly input any value I want in the box of the boundary condition. If you get the 'unexpected error', I would say you may have issues with your geometry. I usually receive such an error when something goes wrong in comsol with complicated geometries. Have you started the model from scratch? There may also be compatibility issues between 4.3 and 4.2. Cheers
Jonathan Kobine
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Posted: 1 decade ago Dec 10, 2013, 12:30 p.m. EST
Hello again. Many thanks for your reply - I really appreciate it. I now have version 4.3 running under Windows 7, and it works exactly as you describe. I think it was a problem with upgrading to OS 10.9 on my Mac setup. I will run from the PC from now on!
Hello again. Many thanks for your reply - I really appreciate it. I now have version 4.3 running under Windows 7, and it works exactly as you describe. I think it was a problem with upgrading to OS 10.9 on my Mac setup. I will run from the PC from now on!

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