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-   -   pressure value out of domain! (http://www.cfd-online.com/Forums/cfx/121359-pressure-value-out-domain.html)

feizaghaee July 26, 2013 08:34

pressure value out of domain!
 
I'm simulating a weir in a channel. I want to read pressure in some specific points. I draw a line with "cut" option then I read pressure at the first point of the line but I noticed that there are some pressure values below this point out of the domain. How is it possible?! what's the problem?

ghorrocks July 27, 2013 07:26

The cut option is giving you a value at every point that curve cuts a control volume boundary face.

feizaghaee July 27, 2013 16:22

Quote:

Originally Posted by ghorrocks (Post 442301)
The cut option is giving you a value at every point that curve cuts a control volume boundary face.

I know that but I can also read pressure values by probe tool. how is it possible to exist values for pressure out of domain?!

ghorrocks July 28, 2013 07:43

It is interpolating from the control volume points to the locations you are specifying. The interpolation is not perfect and can result in locally strange results.

mjgraf July 28, 2013 10:41

alternative is to create a contour on X, Y, Z, or theta on a plane or iso surface. If this gives a contour line where you are interested, create a polyline from this contour line and see if the problem remains.
or create a polyline from a boundary intersection.

feizaghaee July 29, 2013 03:30

thank you all.


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