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Old   November 15, 2004, 05:51
Default oil combustion
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Hi I am solving oil combustion problem on CFX 5.7, in which I am facing problem of convergence.

a. I started with a timescale of 5 e-3, but problem was not converging even after 970 iterations.

b. I tried to keep a timescale of 1e-3, but mass and momentum residuals showed oscillations, so stopped solver.

c. I restarted the problem with timescale of 1e-3 for mass fractions and 5e-3 for global model. But still the convergence rate is very slow.

Can somebody suggest me some tips to improve the convergence in oil combustion or combustion related problems Thanks Krishnarao
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Old   November 16, 2004, 15:29
Default Re: oil combustion
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Try lovering time step and then increase when runing...Sometimes the time step could be as low as 1e-8 [s]
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