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restone

新虫 (初入文坛)

[交流] 【求助】Time step too small in stiffbs是怎么回事? 已有2人参与

Sample Text在用离散相求解水滴蒸发时,连续相计算完后,用热质耦合计算,没有问题,后来加入了UDF帮助中的DPM_SOURCE就出现了:
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
之类的,就out of memory,没法算下去了。怎么回事呢?请各位大侠指教!!!
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robert2020

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这句话不是说在 stiffbs 中的时间不长太小了吗?步长太小计算量太大然后当然要out of memory,可不可以取大点再计算?

Fluent没有用过,不知道说的对不对。
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3楼2010-12-07 09:11:19
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restone

新虫 (初入文坛)

自己再顶一下
2楼2010-12-06 15:36:35
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