|January 23, 2014, 09:37||
Convergence Problem using 2. order implicited time discretization
Join Date: May 2013
Posts: 33Rep Power: 4
I'm simulating melting behaviour in a 2D geometry, dominated by natural convection.
I already did a grid dependency study and calculated a time step, which should be small enough.
So far my residuals fulfilled the criteria easily (10-6/10-6/10-6 and 10-10 for energy) with an average of 6 Iterations.
I changed from First order to second order implicid (nothing else!) and now the residuals for continuity stop decreasing at around 10-3 and I have no idea why.
Thanks in advance
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