I am trying to simulate the melting process of paraffin in a 2-D rectangular cavity by creating the temperature difference on vertical walls while both horizontal walls are kept adiabatic. AMG solver shows divergence error in temperature, pressure and momentum all one by one only when I use UDF for material property variation, But when I use the constant values of paraffin properties, it doesn't show me any error.
I have tried changing the under-relaxation values but nothing happened.
kindly help me to sort out this issue.
Please check the UDF. Definitely there are problems in UDF
Look at the material property equations in UDF. If there is a significant variation in the values then you made need a very small time step. Also there can be a range of temperature where your equation may not be defined. Look into the code of UDF
1- Check is you are using 32 or 64 bits solver.
2- Check your time step (may be a smaller one is required). and your material properties.
3- Check your under-relaxation factors (you may need to reduce them for better solution stability).
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