Hello,
How is it possible to enter an expression as a variable in PDE?
I am using Coefficient form PDE and I have my PDE equation attached. I have Material properties dependent on Cv and T defined in materials section. I defined Cm as a variable in my pde but I want to force my equation (first one in pic) use my expression for Cm (2nd expression in pic dependent on Cv and T)!
I tried Defining Cm in definitions as expression (function) but it gives me this error,
- Feature: Compile Equations: Stationary (sol5/st1)
Error in multiphysics compilation.
Duplicate parameter/variable name.
- Variable: comp1.C_m
How can I define it correctly?!
Regards,
Are you sure that under global parameters you have not defined Cm as a parameter, and forgotten about it? It says that you a duplicate of Cm. If your only physics is PDE, then we can all open your file if you upload it. Feel free to do so, and I will have a look.
Rene Christensen thanks for your answer, I am sure that I have not defined Cm as a parameter under global parameters adn it still gives same error.
I tried adding another PDE or ODE (with defining Cv as variable) and entering second equation (in pic) in the f (source) of the global form of PDE (Other coefficients are zero)! This way I don't get previous error but I am facing not converging.
My file has Laminar flow and Heat transfers as well, and my version is 5.3. still I upload my file.
I do not sure whether or not it would help you; however, you can add coefficient PDE2 to your coefficient form PDE1 interface and just put the coefficient of your c_m which depends on temperature.
Regards.
Siamak.
What you have to do is:
1- Create all your variables as function of "T" (See picture 1: my function Tinit is function of "y", it can be "t" for time or "T" for temperature).
2- Set or put your function at the physics interface (See Picture 2).
Hope you will make it.
Thank you all for your responses,
I could solve it with adding another ODE.
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