# Measuring Distance between area of underpressure and overpressure

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May 26, 2011, 05:25
Measuring Distance between area of underpressure and overpressure
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Join Date: Dec 2010
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Hi guys

I am handeling with a ContourPlot which shows an area with two pressure Areas...one is under the ambient level, the other one over.

How can I measure the pressure minima tu pressure maxima distance?

The problem is that the underpressure area is on the x-y Surface and the overpressure area is on the x-z Surface

Is there a way to calc this with post?

or do I have to do it on my own
Attached Images
 AbsPres1.jpg (54.2 KB, 6 views)

 May 26, 2011, 06:45 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,695 Rep Power: 143 The easy manual way is to define some points and manually move them to the right spots and work out the distance between them. The tricky automatic way is to define two volumes from iso-surfaces which get the high and low pressure regions. Then get the centroid of the volumes (using, for the X direction volumeInt(X)@volume/volume()@volume), then calculating the distance between the centroid points. Pretty easy, but a few steps.

 May 30, 2011, 03:47 #3 Senior Member   Join Date: Dec 2010 Posts: 135 Rep Power: 15 Hi, Thanks for reply... I tried your suggestion and there is one problem. I cannot create a volume with my Isoclip Area over or above ambient pressure. There is always no Volume defined. The Area itself is given. I use the "From Surface" Option to create the volume

 May 30, 2011, 06:19 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,695 Rep Power: 143 Do you have any areas above ambient pressure?

 May 30, 2011, 08:54 #5 Senior Member   Join Date: Dec 2010 Posts: 135 Rep Power: 15 Yes, I have, I have got two areas defined...one area under ambient pressure, and the other one over...xx. in mē

 May 30, 2011, 20:20 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,695 Rep Power: 143 The approach should work, check for mistakes in your post processing.