Hi
How can I couple 2 temperatures in different physics!?
I have laminar flow and heat transfer in fluids Modules and one extra PDE Eqn. I want to have the same Temperature in both PDE and Heat transfer equations. But Comsol doesn't let me have the same T in PDE and I have to enter like T2 instead. I want the temperature in the first equation to be equal to last equation. I have attached the 4 equations that I want to solve simultaneously. (T in last equation is equal to first eqn.
I tried using temperature coupling in multiphysics but there my PDE equation is not shown there. (Just Laminar flow and Heat transfer in fluids are available!)
Also, I tried to use T2=T in variables in the definition. but i get this error:
'' Duplicate parameter/variable name.
- Variable: comp1.T2
Error in multiphysics compilation.
- Feature: Compile Equations: Stationary (sol2/st1) ''
Hello
If you want to use a same variable for tow different phenomena you should not add another physic. you just use a right click and add another phenomenon. If you add another physic Comsol considers it as a different variable.
Dear Mohsen,
Thanks for your response. But I am not able to change or add anything to the default eq of any module. I have a PDE eqn which I have to solve simultaneously with other modules. See, I have these 3 modules.
Dear Siamak,
You can solve these equations in COMSOL easily. I have done this before for Buongiorno’s model of nanofluids before.
For the first equation, COMSOL will solve the equation for Fi (not T) if the variable of the coefficient form PDE is fi . There is no problem with velocity in laminar flow. For the heat equation also COMSOL will solve for T. You just need to write (Tx+Ty) (which is delT) in the first equation (in the coefficient form PDE). This way, you only have one T which is exactly the Temperature you need.
Dear Mohammad,
Thanks a lot for your answer.
Yes, it is exactly the way you explained. But I didn't get exactly how should I do this. I can use alfa and gamma to enter D-T coefficient, If I use alfa then I need to write gradT/T. How should I write that in three parts o alfa coefficient? and also D-B, If I write T in the coefficient, comsol will understand what I mean?! or I have to write it as something like comp1.T ?!!
I appreciate your help
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