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Sample model, "Laminar flow in a baffled stirred mixer", doesn't run

Posted Oct 28, 2010, 3:07 p.m. EDT Fluid & Heat, Computational Fluid Dynamics (CFD) Version 4.1 11 Replies

Sylvana Garcia
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Hi

While trying to learn from this sample model, I was following the steps in the pdf but was getting an error. After checking again and again, I decided to run the actual model from the model library, and got the same error:

"The following feature has encountered a problem:
- Feature: Time-Dependent Solver 1 (sol1/t1)
- Error: Failed to find consistent initial values."

Is there an error in this sample model? What could it be?

Sylvana Garcia
11 Replies Last Post Nov 16, 2011, 12:12 p.m. EST
Sergey Anpilov
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Posted: 1 decade ago Nov 1, 2010, 3:58 p.m. EDT
Hi. I'm getting a kind of similar error:

"The following feature has encountered a problem:
- Feature: Time-Dependent Solver 1 (sol1/t1)
- Error: Failed to evaluate expression."

For example when i make a single cube with still fluid (no sources, inlets, outlets - just walls).
Yet - Busbar sample from the tutorial works fine.

If i have any ideas - i'll post them here
Hi. I'm getting a kind of similar error: "The following feature has encountered a problem: - Feature: Time-Dependent Solver 1 (sol1/t1) - Error: Failed to evaluate expression." For example when i make a single cube with still fluid (no sources, inlets, outlets - just walls). Yet - Busbar sample from the tutorial works fine. If i have any ideas - i'll post them here
Sylvana Garcia
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Posted: 1 decade ago Nov 1, 2010, 5:37 p.m. EDT
Hi

Thanks for your reply! Since it's the sample model that didn't work for me, I sent this question to Comsol Support. We'll see what their answer is, and I'll keep you posted!

Sylvana
Hi Thanks for your reply! Since it's the sample model that didn't work for me, I sent this question to Comsol Support. We'll see what their answer is, and I'll keep you posted! Sylvana
Ricardo Contreras
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Posted: 1 decade ago Nov 8, 2010, 6:02 p.m. EST
Hi!

I have the same problem, Sylvana, did you alredy get a response from Comsol Support? Plaese share with me! Thanks
Hi! I have the same problem, Sylvana, did you alredy get a response from Comsol Support? Plaese share with me! Thanks
Certified Consultant
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Posted: 1 decade ago Nov 30, 2010, 9:10 a.m. EST
Hi Sylvana,
we cannot reproduce the problem neither in 4.0a nor 4.1. That model takes some 1.4 GB in physical RAM. Could it be an out of memory problem on a 32-bit operating system? Look in the Error node in the model tree of the model and look for Out of Memory messages.

Read more about memory intensive models and the need of 64-bit OS here: www.comsol.com/support/knowledgebase/830/.

--
Niklas
Hi Sylvana, we cannot reproduce the problem neither in 4.0a nor 4.1. That model takes some 1.4 GB in physical RAM. Could it be an out of memory problem on a 32-bit operating system? Look in the Error node in the model tree of the model and look for Out of Memory messages. Read more about memory intensive models and the need of 64-bit OS here: http://www.comsol.com/support/knowledgebase/830/. -- Niklas
Sylvana Garcia
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Posted: 1 decade ago Nov 30, 2010, 11:22 a.m. EST
Hi, Niklas

Thank you for your assistance. I tried to run the mixer model and got the same error. When I look in the Error node, it says:

"Failed to find consistent initial values.
Internal error in solver."

I am using a 32-bit system with a RAM of 3.00 GB.

Again, thanks!

Sylvana

Hi, Niklas Thank you for your assistance. I tried to run the mixer model and got the same error. When I look in the Error node, it says: "Failed to find consistent initial values. Internal error in solver." I am using a 32-bit system with a RAM of 3.00 GB. Again, thanks! Sylvana
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Dec 1, 2010, 2:58 a.m. EST
Hi

but which COMSOL version/ patch ?
best today is 4.1.0.112 ;)

--
Good luck
Ivar
Hi but which COMSOL version/ patch ? best today is 4.1.0.112 ;) -- Good luck Ivar
Sylvana Garcia
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Posted: 1 decade ago Jan 21, 2011, 9:38 a.m. EST
Hi

I'm sorry, I should have written this message a long time ago. The mixing sample model "Laminar flow in a baffled stirred mixer" is now working for me. I ran it in a 64-bit computer with 3 G RAM. Thanks Comsol for the assistance.

Sylvana

Hi I'm sorry, I should have written this message a long time ago. The mixing sample model "Laminar flow in a baffled stirred mixer" is now working for me. I ran it in a 64-bit computer with 3 G RAM. Thanks Comsol for the assistance. Sylvana
Houman Javadzadeh
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Posted: 1 decade ago Nov 12, 2011, 4:57 p.m. EST
Hello
Is there a chance you can send me your baffled mixer model?

I would like to take a look at this.

Regards,
Hello Is there a chance you can send me your baffled mixer model? I would like to take a look at this. Regards,
Sylvana Garcia
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Posted: 1 decade ago Nov 14, 2011, 10:07 a.m. EST
Hi, Houman

This was one of the sample models from the model library. I tried to attach it here but the file size seems too high. Try looking for it in the model library, which you can access from the File menu/Open model library. It's in the CFD Module.

Sylvana
Hi, Houman This was one of the sample models from the model library. I tried to attach it here but the file size seems too high. Try looking for it in the model library, which you can access from the File menu/Open model library. It's in the CFD Module. Sylvana
Jason Castro
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Posted: 1 decade ago Nov 16, 2011, 10:32 a.m. EST
Hi

I m working in a simulacion similar to that model, but in this case the viscosity is a function of the time. I dont see any advance in the solucion and started three days ago. What could be happening?
Hi I m working in a simulacion similar to that model, but in this case the viscosity is a function of the time. I dont see any advance in the solucion and started three days ago. What could be happening?
Houman Javadzadeh
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Posted: 1 decade ago Nov 16, 2011, 12:12 p.m. EST
I do not find it in the libaray model?
Is there a way you can zip it and email it me?

I do not find it in the libaray model? Is there a way you can zip it and email it me?

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