|January 27, 2015, 13:43||
Join Date: Jan 2015
Posts: 5Rep Power: 2
I am trying to keep track of the velocity through time in one of my simulations (simplefoam). I am using the probes utility, but the location is working in a different than I thought. I defined a location of (0.013 0 0) in a wall boundary where I have set the boundary condition of (0 0 0) velocity, but I am getting values of velocity different from zero. How can I understand this?
|January 27, 2015, 15:30||
Join Date: Feb 2011
Location: Helsinki, Finland
Posts: 152Rep Power: 10
Here some explanations: The probe utility takes a given location and tries to find the cell that contains this location. Meaning the location has to be inside a cell for this to work.
The sampled value at the probe location is then obtained by interpolation. By default the cell center value is interpolated to the probe location, but you can specify different interpolation schemes in probesDict via the keyword interpolationScheme.
So, even if you pick a location that is very close to the boundary (as in your case), OpenFOAM will interpolate the cell value to this location, which may well differ from zero due to the interpolation.
Also note that if you specify your velocity boundary condition as fixedValue, the value will certainly be fixed, so no need to set a probe exactly on the boundary. You can check it in ParaView.
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