请教--关于模型unstable
最近老被一个问题困扰。在做纯流体的模型时，经常碰到如下类型的warning, 虽然模型可以运行，但结果不对。哪位有这方面的经验，谢谢指点.
*** WARNING *** CODE ADF2006:
Model may be unstable! Ratio 1.3170E+14 of largest to smallest diagonal
elements in factorized coefficient matrix is greater than 1.E+11. The
largest diagonal element 9.95679E+10 corresponds to
y-velocity at node (label) 9288 and the smallest
diagonal element 7.55968E-04 corresponds to pressure
at node (label) 37579.
When this ratio is too large, machine round-off errors may become so
severe that stable models become unstable.
*** WARNING *** CODE ADF2006:
Model may be unstable! Ratio 7.8769E+12 of largest to smallest diagonal
elements in factorized coefficient matrix is greater than 1.E+11. The
largest diagonal element 6.59802E+10 corresponds to
y-velocity at node (label) 51222 and the smallest
diagonal element 8.37639E-03 corresponds to pressure
at node (label) 40415.
...... 还要检查载荷，边界条件及模型初始条件的正确性。
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