Robert Koslover
Certified Consultant
Please login with a confirmed email address before reporting spam
Posted:
1 year ago
2023年8月29日 GMT+2 20:38
Updated:
1 year ago
2023年8月29日 GMT+2 20:35
First thing: I didn't notice a mesh anywhere in your model. Normally (at least in my experience) you have to have a mesh to execute a finite element model. Other than that, I think your boundary conditions may have some issues. But... one step at a time.
-------------------
Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
First thing: I didn't notice a mesh anywhere in your model. Normally (at least in my experience) you have to have a mesh to execute a finite element model. Other than that, I think your boundary conditions may have some issues. But... one step at a time.
Dave Greve
Certified Consultant
Please login with a confirmed email address before reporting spam
Posted:
1 year ago
2023年8月29日 GMT+2 23:49
Updated:
1 year ago
2023年8月29日 GMT+2 23:50
I ran it with a default mesh and it didn't seem like it was converging.
I would run the electrical problem by itself to make sure that converges OK.
I ran it with a default mesh and it didn't seem like it was converging. I would run the electrical problem by itself to make sure that converges OK.
Please login with a confirmed email address before reporting spam
Posted:
1 year ago
2023年8月30日 GMT+2 08:29
Updated:
1 year ago
2023年8月30日 GMT+2 08:29
First thing: I didn't notice a mesh anywhere in your model. Normally (at least in my experience) you have to have a mesh to execute a finite element model. Other than that, I think your boundary conditions may have some issues. But... one step at a time.
Thanks for the comment,
I used physics-controlled mesh, with finer element size(which was irrelavent with computing result.). but I couldn't upload the MPH file containing the mesh due to 5-MB size limit. And, I also checked boundary conditions, for both Electric Currents and Heat Transfer in Solids, by trunning off the Multiphysics module and running each physics solely. Which resulted in convergence. (it did not shown the temperature rise by joule heating of course.) It would be so grateful if you take a look once again.
Thanks.
>First thing: I didn't notice a mesh anywhere in your model. Normally (at least in my experience) you have to have a mesh to execute a finite element model. Other than that, I think your boundary conditions may have some issues. But... one step at a time. Thanks for the comment, I used physics-controlled mesh, with finer element size(which was irrelavent with computing result.). but I couldn't upload the MPH file containing the mesh due to 5-MB size limit. And, I also checked boundary conditions, for both Electric Currents and Heat Transfer in Solids, by trunning off the Multiphysics module and running each physics solely. Which resulted in convergence. (it did not shown the temperature rise by joule heating of course.) It would be so grateful if you take a look once again. Thanks.
Robert Koslover
Certified Consultant
Please login with a confirmed email address before reporting spam
Posted:
1 year ago
2023年8月30日 GMT+2 17:04
Updated:
1 year ago
2023年8月30日 GMT+2 17:01
- Eliminating yourspecificationof the mesh entirely is not necessary to clear the mesh. Instead, you should be able to get your file below 5MB by choosing "Clear All Built Meshes" and "Clear All Solutions" from the ribbon at the top. If you then post that .mph file, others here will be better equipped to find the errors.
- I noticed different boundary conditions on those two similar rectangles at the top of your model. You might want to take a closer look at those.
-------------------
Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
1. Eliminating your *specification* of the mesh entirely is not necessary to clear the mesh. Instead, you should be able to get your file below 5MB by choosing "Clear All Built Meshes" and "Clear All Solutions" from the ribbon at the top. If you then post that .mph file, others here will be better equipped to find the errors. 2. I noticed different boundary conditions on those two similar rectangles at the top of your model. You might want to take a closer look at those.
Please login with a confirmed email address before reporting spam
Posted:
1 year ago
2023年8月31日 GMT+2 07:18
Updated:
1 year ago
2023年8月31日 GMT+2 07:18
There are two problems with the model. 1. There is no mesh setting. Please make mesh node and setting mesh. 2. I think this model shows increasing temperature. So Stationary study not converged. please test this model time dependent study.
Thanks.
There are two problems with the model. 1. There is no mesh setting. Please make mesh node and setting mesh. 2. I think this model shows increasing temperature. So Stationary study not converged. please test this model time dependent study. Thanks.
Jim Freels
mechanical side of nuclear engineering, multiphysics analysis, COMSOL specialist
Please login with a confirmed email address before reporting spam
Posted:
1 year ago
2023年9月2日 GMT+2 04:54
Updated:
1 year ago
2023年9月3日 GMT+2 02:14
- added mesh
- changed from normal to next finer mesh to remove warning message about too-small surface area mesh
- change solvers to all direct using mumps
- added some plots of temperature at the outer surfaces
- reduced damping factors on all variables to 0.5, and set the pseudo time stepper on to slow things down to allow for debugging
- saw that the temperature was eventually going very high
- decided to reduce the current input at the terminal surface by a factor of 0.5 using an added reducing parameter
- came to good steady state
- removed pseudo time stepper
- added some plots of T, V, and current
- removed the transparency graphics
- suggest checking your consistency on which surfaces receive the convective boundary, looks like one of your ground surfaces receives it, and the other doesn't 13.attached the changed model file
- leave a good tip at the table
-------------------
James D. Freels, Ph.D., P.E.
1. added mesh 2. changed from normal to next finer mesh to remove warning message about too-small surface area mesh 3. change solvers to all direct using mumps 4. added some plots of temperature at the outer surfaces 5. reduced damping factors on all variables to 0.5, and set the pseudo time stepper on to slow things down to allow for debugging 6. saw that the temperature was eventually going very high 7. decided to reduce the current input at the terminal surface by a factor of 0.5 using an added reducing parameter 8. came to good steady state 9. removed pseudo time stepper 10. added some plots of T, V, and current 11. removed the transparency graphics 12. suggest checking your consistency on which surfaces receive the convective boundary, looks like one of your ground surfaces receives it, and the other doesn't 13.attached the changed model file 14. leave a good tip at the table