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Conjugated heat transfer - no convergence
Posted 25 nov 2014, 04:34 GMT-5 Fluid & Heat, Heat Transfer & Phase Change, Studies & Solvers Version 4.4 0 Replies
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I am modelling a heat transfer problem coupled with convection in a fluid using the conjugated heat transfer module. My material properties are temperature dependent. The model is time dependent. BCs are periodic BC for fluid flow and heat, symmetry BC for fluid flow and heat, a pressure point constraint and a constant temperature at on wall. I added a volume force to account for convection.
I solved the model in 2D first and I got a reasonable solution. Now I upgraded the model to a simple 3D geometry- a block with a tube inside. The problem is, I can't get the solution to converge in 3D. I use an "extra fine" mesh and time steps of 1 sec with a relative tolerance of 1e-3.
I already tried changing the termination technique in the fully coupled mode from "constant" to"automatic highly nonlinear" but still no convergence.
Any ideas what I could try to get the model to converge?
Thank you for your input!
Hello Judith Hoerstmann
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