流体计算出现的问题!急啊!
之前计算流固耦合的问题有问题,就先简化成普通的流体计算,但是又出现下面的错误:*** WARNING *** CODE ADF2006:
Model may be unstable! Ratio 4.6077E+12 of largest to smallest diagonal
elements in factorized coefficient matrix is greater than 1.E+11. The
largest diagonal element 5.98308E+09 corresponds to
y-velocity at node (label) 10573 and the smallest
diagonal element 1.29848E-03 corresponds to y-velocity
at node (label) 2841.
When this ratio is too large, machine round-off errors may become so
severe that stable models become unstable.
Possible causes are:
* Solution procedure has been divergent;
* Ratio of largest to smallest elements is too large;
* No fixed pressure condition in enclosures;
* Improper units are used in this model. If this is the reason, you
may either change the input data in another unit system or use the
automatically nondimensional procedure by choosing proper scales.
觉得网格没有什么问题啊,怎么总说我的网格比例有问题啊,请哪位高手帮忙看看到底是什么问题,附件就是命令流。急啊! 自己顶一下啊,希望有人帮我解答一下,之前做二维的没有碰到过这种情况啊! 自己顶一下啊,希望有人帮我解答一下,之前做二维的没有碰到过这种情况啊!
dy-1985 发表于 2010-12-7 21:38 http://forum.simwe.com/images/common/back.gif
你通过node找到所在的element, 而后再找到哪个volume, 而后把组成那个volume的点调调,
很可能就好了. 另外换一下time step也会有用. 3# zzteng
调volume的点,是位置不对吗?我后来也总跳出来这么一堆的warning,但是可以计算下去,但是速度很慢! 3# zzteng
我的qq是240272952,希望加你跟你讨教一下!周围懂得这个的人不多! 3# zzteng
调volume的点,是位置不对吗?我后来也总跳出来这么一堆的warning,但是可以计算下去,但是速度很慢!
dy-1985 发表于 2010-12-11 16:02 http://forum.simwe.com/images/common/back.gif
有时算是可以算下去, 但最后结果不对.
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