wave tank absorbing problem

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April 23, 2011, 23:17
wave tank absorbing problem
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hi. i'm trying to absorb waves in the end of a 2-D wave tank using momentum source method. this is what i've done, and i met some problems.

1. suppose that the velocity field after absorbing is
where C is a spatial transition coefficient varies from 1 to 0. the subscript j represents the value before absorbing, and m represents the value after absorbing. substracting the momentum equations with source term
with the momentum equations without source term
i got the horizontal momentum source
where C' is the horizontal deviation of C.
by the same way i got the vertical source
.
after applying them into FLUENT, i got the problem of water level shown in this image
i defined the region from 80 to 100 is the absorbing area. this picture was taken at t=1s. it seems like the absorbing part didn't absort any wave but also generated a wave! and after a long time, the water level at x = 100 went down to y=3.5m. i really don't know where i am wrong. would u help me please? this problem really disappointed me.
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