[colinB]

Hi guys,

I have a problem with my BC.
I want to have a simple two phase simulation of water flowing around a ship.
Therfore I use interFoam with the k-Omega-SST turbulence model. As BC I use a seperate water-inlet beside an airinlet, for the water domain I have defined BC called freestream and for the air domain I have defined an atmosphere. Actually freestream and atmosphere should be transmissve, but for some reason (I think) I get waves reflecting from the 'outlet' or somthing is wrong with the inlet.
The BC are as follows:

U
freestream: inletOutlet
uniform ( X Y Z)
uniform ( X Y Z)
waterInlet fixedValue
uniform ( X Y Z)

p_rgh
freestream: zeroGradient

waterInlet: zeroGradient

However I discussed that problem with some people and finally got the hint to use a numerical beach instead of transmissive BC and related to that I found some slides from Eric Paterson with an added damping term for the solver but I don't know how to include this into my problem and how to tell the solver that it just shall add this term for x< a certain value.
The slides I read you find here:
http://powerlab.fsb.hr/ped/kturbo/op...nNuTTS2009.pdf
jump to slide 17

I hope somebody can help me
If more information is required let me know I will provide it.

best regards
Colin