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jthiakz March 22, 2013 09:17

K-E residual fluctuation in combustor analysis
Case details
# Tet mesh with 0.27 quality in ICEM CFD
# No interfaces
# combustor domain + exit domain
# Solving mass+momentum+energy+combustion equations, SIMPLE algorithm

K-E residuals are fluctuating after changing from first order to second order (after 500 iteration)in pure tet-mesh CFD domain. K-E residuals are fluctuating even after 5000 iterations

Max residuals are only at a location with few elements connected to it. There elements are fine and above 0.27 mesh quality.
I used the same mesh + same fluent setup for different exit domain, there residuals are fine and solution is converging .The difference between the geometries are very minimal 0.030inch to 0.050 inch change in exit length. Remaining all are same.

Can anyone help me to find the root cause ?:confused:

Far March 23, 2013 04:27

Why Simple algorithm?

jthiakz March 23, 2013 06:07

Not SIMPLE , it is SIMPLEC . But no specific reason. Earlier analysis I tried with coupled algorithm but i found this SIMPLEC method shows faster convergence.

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