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

simpson · February 11, 2012, 18:06

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 doesn´t 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 wasn´t found.

I´m 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?

I´m looking forward to recieving your answeres

lukasf · April 15, 2019, 06:56

Have you found a solution? I please let me / us know.

February 11, 2012, 18:06	b.c., how to exterminate undesired pressure waves?	#1
simpson New Member Stefan Wilhelm Join Date: Jan 2012 Posts: 4 Rep Power: 14	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 doesn´t 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 wasn´t found. I´m 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? I´m looking forward to recieving your answeres

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April 15, 2019, 06:56		#2
lukasf Senior Member Lukas Fischer Join Date: May 2018 Location: Germany, Munich Posts: 117 Rep Power: 8	Have you found a solution? I please let me / us know.