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发表于 2005-5-1 18:38:14
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[求助]谁对 Arbitrary-Lagrangian-Euler (ALE)方法比较熟
i am doing a transient computation about gas-liquid problem in 1D, in which a liquid slug treated as incompressible is driven by gas of high pressre and velocity in a pipline with a 90 degree bend at end.
i was thinking to add grid points every two(or four...depends on CFL conditon) time steps, but it did not seem so convenient to be implemented.
i guess ALE would be a good choice to this case, wouldn';t it?
i';ve read some papers, but i am still not very clear how to apply ALE in this case:
1. to tracking the interface, it can be done by setting the interface velocity equal to the fluid velocity at the interface, however, the interface velocity is also an unknown. so how to deal with it?
2. it is only need to take account of gas domain, isn';t it? the up streamboundary is quite straightforward as inflow B.C, but how about the downstream? |
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