Class 3 Error
SYMPTOM:
There can be a problem of conservation of chemical elements when using CFX RIF. Only the solutions near chemical equilibrium (Chi=0) seem to be affected.
PROBLEM:
This is due to a bug in the code received from Advance
WORKAROUND: To work around, you can let the solver ignore the lowest Chi values in the flamelet library by adding the "Skip Over Scalar Dissipation Rate Samples" parameter (Solver Manager/Edit Definition File). Set this such that values of Chi<0.05 are skipped, e.g. for the Flamelet library with 20 samples for Chi: REACTION: x1 CCC Reaction Description = 1) C1C4 Tox=288.0 [K] Tfu=288.0 [K] p= 1 [bar] Option = Flamelet Library Library File = CCC_cfx5.fll Materials List = ... Skip Over Scalar Dissipation Rate Samples = 5 # Set this such that skips samples Chi<0.05 END This will give proper balances for chemical elements in the CFD solution. The limitation of this workaround is that chemical equilibrium composition will not be reached, instead composition will be for a (slightly) strained flame. FIXED IN: Not fixed yet. |
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