Undefined value found
Hi, i can solve my semiconductor model with a relatively coarse mesh. However the found solution is not good enough. It shows some differences to a reference (PC1D) semiconductor model. That is why i...
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Hey, i have the same problem i push the icon restart y works.
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Hi My first reaction is that you are hitting a numerical limitation (you case is a typical examples of the type I send myself to COMSOL support). As you say, normally you should have a denser mesh...
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Hi If it works on second try with a "restart" it could come from the initial conditions, since normally a restart ""re-start" from current level of already calculated results Ivar
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Hello Mr. Ivar Can you give me some advice with the following errors. Error: Time 1.386578133869988: Error in Jacobian computation: Undefined_value_found_Solvermodel Undefined value found in the...
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Hi unfortunately no apart that forme it means you have a complex model ;) But it looks like there is un undefined variable, so are you sure your BC are real everywhere or over the time ? For the second...
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Hello Mr. Ivar KJELBERG Thank you for your advice. I sent a private message to Mr. Ivar. Please help me. Sincerely, N.L nhhieubk@gmail.com
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Hi Stefan Have you got any solution to this problem? docnurulhasan@gmail.com
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Hi, I did not further work on that specific issue and i did not try the "restart option", but please keep us updated if you do. Currently I am working on a model with a conductive boundarie instead of...
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Hello All..!!! I was having the same problem And I could fix it changing the Intial Value and the Values of variables not solved Option inside the Solver Manager...this may be happening because You...
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I had the same problem. The reason is possibly that initial value is zero in the first calculation step. I changed the initial value from zero to a expression not Zero. It worked.
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I had this problem as well in my 3D model. Initially I thought this was a mesh problem and that I need only refine it. This though did not correct the problem. Reading the above comments I set the...
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I am facing a similar problem now. I am trying to couple heat and mass transfer in a transient problem. For mass transfer, there is drastic difference in concentrations between subdomains. In one of...
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Hi Stefan, I am having the same problem, and I am also trying to solve a model for semiconductor. Can we share our experience doing this? You can write me to gsantil@ieee.org According to my lectures,...
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Hi Gerard, it is long time ago I worked on that issue. You might try to have an initial value expression with non-zero slope (if you did not already do so). And you might want to have a look at our...
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Good day, I am trying to model a 2D catalytic plate reactor with CH4 reforming and CH4 oxidation the two relevant reactions taking place within porous media (co-current). A central plate is conducting...
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