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-   -   b.c., how to exterminate undesired pressure waves? (http://www.cfd-online.com/Forums/openfoam-pre-processing/97210-b-c-how-exterminate-undesired-pressure-waves.html)

simpson February 11, 2012 18:06

b.c., how to exterminate undesired pressure waves?
 
Hi all,

to start with, Im quite new to OpenFOAM.
To start my originally desired simulation, the fluid (water) should flow in a stationary condition into a tank, afterwards trough a conected pipe and then leave the apparatus.
Unfortunately it doesnt reach a stationary condition. Pressure oscillates forth and back the tank and pipe instead.
I tried different settings. I mostly set the internal fiel to the desired velocity and the pressures to zeroGradient. Some ideas have been rising velocity starting from zero with groovybc or using waveTransmissive b.c. to kill the pressure waves, whereas the latter did not work due to "psi", which wasnt found.

Im using sonicLiquidFoam in OpenFOAM (v. 1.7.1) for my simulation.

Does anyone have an idea how I could eighter avoid causing pressure waves or damping them to zero?

Im looking forward to recieving your answeres :)


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