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kris September 1, 2005 04:50

about simulation of Pulverised coal combustion
 
for coal simulation, peak temperature is suddenly going up very high and concurrently residuals for mass, enthalpy is also negative value to positive value(~10^1 or 10^2 order) very iteration. after 100 or 500 iteration, my simulation is unstable or diverging

as long as i know, source term value of energy equation for Eulerian frame is high by cause of coal combustion model...

I can't solve this problem even though I set limitation of max. temperature as 3000K

Anyway, how can I solve this problem?

next values is diverged values

================================================== ===

PEAK FLAME TEMPERATURES IS 2727.00000000000 IN CELL 1983

UMOM VMOM WMOM MASS T EN DISS ENTH

2.05E+01 6.20E+01 3.02E+01 2.54E+00 5.17E-01 8.26E-01 NaN

**************************************************

* THERE ARE WARNINGS IN FILE star.info

**************************************************

*** SOLUTION DIVERGES/UNSTABLE.

*** CALCULATIONS TERMINATED; NEW FILE.div WRITTEN

STAR-CD Version 3.20.000 Computational Dynamics, Ltd. END OF EXECUTION - STAR CPU TIME IS 1162.38 ELAPSED TIME IS 1214.95 MEMORY (DYNAMIC) USED IS 56 MBYTES



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