Variable-domain variational principles can couple the variable domain into functional, which makes it possible to calculate the flow field with the variable-domain simultaneously.
变域变分原理，可以结合可变区为功能，这使得它可以同时计算流场的变量域。
By use of the variational method, the potential energy principle of a elastic system on a variable domain is discussed.
并用该变分法讨论了具有可变区域的弹性系统的势能原理。
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