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why did Time step is too small in stiffbs?

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Old   December 7, 2008, 20:46
Default why did Time step is too small in stiffbs?
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satum
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Hi, everyone. The following message appears when I activate the heat mass coupling in DPM panel. "Time step too small in stiffbs:

Time step too small in stiffbs: dt = 3.819282e-21, t = 4.316239e-04 0 y = 2.000002e-11 dy/dt = -1.075370e+03 1 y = 2.312000e+02 dy/dt = 0.000000e+00

Time step too small in stiffbs: dt = 3.589703e-21, t = 4.311432e-04 0 y = 2.000000e-11 dy/dt = -1.076570e+03 1 y = 2.312000e+02 dy/dt = 0.000000e+00

Time step too small in stiffbs: dt = 3.513279e-21, t = 4.311310e-04 0 y = 2.000002e-11 dy/dt = -1.076599e+03 1 y = 2.312000e+02 dy/dt = 0.000000e+00

Can you explain it?Thank you very much!

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Old   December 10, 2012, 10:15
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Hey, satum. I met the same problem. BTW, have you found the reason? Thank you
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