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Submodeling

Posted 19 juin 2018, 20:43 UTC−4 Porous Media Flow, Optimization, Structural Mechanics Version 5.3a 4 Replies

Shashank Tiwari
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Hello:

I am trying to carry out submodeling using "General Extrusion" operator. I was wondering if it is necessary to cut the the critical part out from the global model to perform submodeling?

I am working on a problem in which the global model has only three domains. My submodel is a cylinder (one of the domains in the global model). I created this cylinder in the submodel (not cut out from the global model) (with same dimensions and material properties as in the global model) and used "General extrusion operator" to transfer results from global model to submodel.

I was wondering if this approach is correct as I did not "cut" this cylinder from the global model?

While defining the "General Extrusion operator", I was wondering if I need to select all the three domains of the global model as the source or should I only select the cylinder as the source as I did not performed any cut in the global model?

I look forward to hearing your comments.

Thanks, Shashank

4 Replies Last Post 21 juin 2018, 09:25 UTC−4
Henrik Sönnerlind COMSOL Employee

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Posted: 6 years ago 20 juin 2018, 01:51 UTC−4
Updated: 6 years ago 20 juin 2018, 01:52 UTC−4

Hi Shashank,

See the answer in the comment field in https://www.comsol.com/blogs/submodeling-how-analyze-local-effects-large-models-2 .

Regards,
Henrik

-------------------
Henrik Sönnerlind
COMSOL
Hi Shashank, See the answer in the comment field in . Regards, Henrik
Shashank Tiwari
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Posted: 6 years ago 20 juin 2018, 09:02 UTC−4

Hi Henrik:

Thanks a lot for your response.

Shashank

Hi Henrik: Thanks a lot for your response. Shashank
Shashank Tiwari
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Posted: 6 years ago 20 juin 2018, 20:44 UTC−4

Hi Henrik:

In reference to my earlier query, I created a submodel of the cylinder and used general extrusion operator to transfer results from the global model to the submodel (cylinder) and validated the results.

I am working on a poroelastic model and want to use the results of the submodel as an intial condition for another component with the exact same geomtery (same cylinder as in the submodel). I tried to create another general extrusion operator in the submodel and use it to transfer results from the submodel to this new "component".

However, I am getting an error "Extrusion coupling operator interpolation failed for at least one point: no source point found". Following this error, there are a number of destination coordinates.

I was wondering if this error is because I am using general extrusion operator from the submodel to transfer results to a geomtery with the same dimensions? If yes, is there a work around to use the results of a submodel as an intial condition for the same geomtery?

I look forward to hearing your comments.

Thanks, Shashank

Hi Henrik: In reference to my earlier query, I created a submodel of the cylinder and used general extrusion operator to transfer results from the global model to the submodel (cylinder) and validated the results. I am working on a poroelastic model and want to use the results of the submodel as an intial condition for another component with the exact same geomtery (same cylinder as in the submodel). I tried to create another general extrusion operator in the submodel and use it to transfer results from the submodel to this new "component". However, I am getting an error "Extrusion coupling operator interpolation failed for at least one point: no source point found". Following this error, there are a number of destination coordinates. I was wondering if this error is because I am using general extrusion operator from the submodel to transfer results to a geomtery with the same dimensions? If yes, is there a work around to use the results of a submodel as an intial condition for the same geomtery? I look forward to hearing your comments. Thanks, Shashank
Henrik Sönnerlind COMSOL Employee

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Posted: 6 years ago 21 juin 2018, 09:25 UTC−4

Hi Shashank,

There is no obvious reason for your problem here; what you describe sounds OK.

You can experimernt with the settings in the Advanced section of the General Extrusion. By setting Use NaN when mapping fails you can see where the mapping fails (it will be not be drawn in a plot).

Regards,
Henrik

-------------------
Henrik Sönnerlind
COMSOL
Hi Shashank, There is no obvious reason for your problem here; what you describe sounds OK. You can experimernt with the settings in the **Advanced** section of the **General Extrusion**. By setting **Use NaN when mapping fails** you can see where the mapping fails (it will be not be drawn in a plot). Regards, Henrik

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