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发表于 2005-1-13 14:25:14
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来自 湖北武汉
Re:有关fix和ini velocity
我觉得手册上的这段话讲得比较清楚了,开始没注意,重读了几遍才明白
Alternatively, the FIX and INI commands can be used to fix the velocity in one or more of the x,y,z-directions at a gridpoint. During the calculation
process, the velocity at the start of stepping is retained no matter what forces act on the FIXed gridpoints. If a zero displacement boundary is
required later in a calculation, the appropriate gridpoint velocities can be set to zero before the gridpoints are FIXed.
As an example, in order to simulate rigid movement of a rough platen on a test specimen, one of
the following code snippets can be used:
fix x z range y -0.1 0.1
apply yvel = 1e-5 range y -0.1 0.1
or
fix x y z range y -0.1 0.1
ini yvel = 1e-5 range y -0.1 0.1 |
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