|May 6, 2014, 02:14||
Pressure BC for interFoam
Join Date: May 2011
Posts: 12Rep Power: 7
I am working on a simulation of a weir with interFoam. Therefore I need a fixed water level at the Outlet to control the actions right behind the weir.
With swak4Foam/groovyBC I can define the pressure on the Outlet to hold the water table on a certain hight:
valueExpression "(pos().z<34) ? (1*9.81*(72-34)+1000*9.81*(34-(pos().z))) : 1*9.81*(72-(pos().z)) ";
also see the sketch.
Problem is that I can just define p_rgh and not the total pressure as a boundary condition.
Is there a way to get interFoam using p as a boundary condition instead of p_rgh in the 0/ folder?
Thanks a lot - Max
|May 16, 2014, 05:00||
Join Date: Oct 2010
Location: Leoben (Austria)
Blog Entries: 6Rep Power: 27
do you want to simulate a "hydraulic jump"?
If yes, the hydraulic jump will be generated by itselfs and if you set up some BC so that you will have a certain water level below your hydraulic jump - i think - it is not physically correct. This water level should be controlled by your geometry design and the flowrate you have. Because this phenomena is a physical effect -> http://holzmann-cfd.de/index.php/sim...herSprungVideo
There was a guy that made a similar simulation for "Nürnberg" I think and first he wanted to do it with BC. At least he was able to do it in a physical correct way (refining the mesh for example).
Otherwise you can check out the "phaseHydrostaticPressure" or you can insert a wall at the outlet. But still - its not the physical way
But at all - I have no idea if you want to simulate a hydraulic jump and therefor my hints are just for that case.
| < outlet patch | < outlet patch | < outlet wall -------------| < outlet wall lower wall
Some interesting OpenFOAM tutorials, publications and videos on www.Holzmann-cfd.de
OpenFOAM Beginners should check out the new wiki on wiki.openfoam.com
A list of some active OpenFOAM contributers can be found »here«
A book about the basics of »Mathematics, Numerics, Derivations and OpenFOAM« can be found on www.Holzmann-cfd.de
|boundary condition, interfoam, pressure, p_rgh, water level|
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