# pressure value out of domain!

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 July 26, 2013, 08:34 pressure value out of domain! #1 Senior Member     moein Join Date: Dec 2009 Posts: 132 Rep Power: 7 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?

 July 27, 2013, 07:26 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,823 Rep Power: 85 The cut option is giving you a value at every point that curve cuts a control volume boundary face.

July 27, 2013, 16:22
#3
Senior Member

moein
Join Date: Dec 2009
Posts: 132
Rep Power: 7
Quote:
 Originally Posted by ghorrocks 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?!

 July 28, 2013, 07:43 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,823 Rep Power: 85 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. feizaghaee likes this.

 July 28, 2013, 10:41 #5 Senior Member   Join Date: Dec 2009 Posts: 129 Rep Power: 10 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 likes this.

 July 29, 2013, 03:30 #6 Senior Member     moein Join Date: Dec 2009 Posts: 132 Rep Power: 7 thank you all.

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