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Conjugate Heat Transfer for Turbulent Flow problem
Posted May 20, 2018, 11:47 p.m. EDT Heat Transfer & Phase Change, Heat Transfer, Studies & Solvers Version 5.2a 0 Replies
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Hello,
I have seen that you have helped a lot of people many times about different types of problems in COMSOL, that's why I'm contacting you.
I study the aerothermal effects of a CubeSat which comes back to earth. First, I made lot of assumptions to simplify my model.
I began to learn COMSOL few weeks ago. First I made a model with laminar flow, I imposed a velocity for the inlet and open boundaries for the outlet. It worked.
Them, I add conjugate heat transfert for laminar and it worked too.
But when I study the turbulent flow I don't understand why it doesn't work ...
I have the message below :
Failed to find a solution. Segregated Step 2 Singular matrix.
There are 409 void equations (empty rows in matrix) for the variable comp1.T. at coordinates: (0.221669,0.25,0.551122), (0.227749,0.25,0.542537), (0.225979,0.241028,0.546981), (0.220487,0.240859,0.555651), (0.225796,0.258812,0.547148), ... There are 409 void equations (empty rows in matrix) for the variable comp1.nitf1.TWall. at coordinates: (0.233762,0.240739,0.538702), (0.234585,0.25,0.535845), (0.227749,0.25,0.542537), (0.24I have seen that you have helped a lot of people many times about different types of problems in COMSOL, that's why I'm contacting you.
I study the aerothermal effects of a CubeSat which comes back to earth. First, I made lot of assumptions to simplify my model.
I began to learn COMSOL few weeks ago. First I made a model with laminar flow, I imposed a velocity for the inlet and open boundaries for the outlet. It worked.
Them, I add conjugate heat transfert for laminar and it worked too.
But when I study the turbulent flow I don't understand why it doesn't work ...
I have the message below :
Failed to find a solution. Segregated Step 2 Singular matrix.
There are 409 void equations (empty rows in matrix) for the variable comp1.T. at coordinates: (0.221669,0.25,0.551122), (0.227749,0.25,0.542537), (0.225979,0.241028,0.546981), (0.220487,0.240859,0.555651), (0.225796,0.258812,0.547148), ... There are 409 void equations (empty rows in matrix) for the variable comp1.nitf1.TWall. at coordinates: (0.233762,0.240739,0.538702), (0.234585,0.25,0.535845), (0.227749,0.25,0.542537), (0.242123,0.25,0.531499), (0.25,0.25,0.53), ... In Segregated Step 2: Returned solution is not converged.
Please can you help me.
You will find my model attached.2123,0.25,0.531499), (0.25,0.25,0.53), ... In Segregated Step 2: Returned solution is not converged.
Please can you help me.
You will find my model attached.
Attachments:
Hello Olivier Lambert
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