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October 15, 2013, 04:56 |
Ratio of velocity in CFD-post
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#1 |
New Member
Join Date: Aug 2012
Posts: 17
Rep Power: 13 |
Hi
My question is about the post-process of a simulation using CFX. I already run a simulation of wind blowing on a opaque wall. Now I would like to visualise de velocity regions behind of the barrier. With the option of CFD-Post contour on a plane I can show contours of velocity. But the experiment that I am using as a base worked with a-dimensional expressions, where contours represent a ratio: U+ = U/Uref U= ameliorated speed (leeward side of the barrier) Uref= speed of reference before the barrier Is it possible to express this function U/Uref with contours? Regards |
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October 15, 2013, 05:33 |
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#2 |
Senior Member
Lance
Join Date: Mar 2009
Posts: 669
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Im not sure I understand you correctly, but I'll give it a shot.
Create an expression in cfd-post, e.g something like Velocity/Uref where Uref is an other expression you defined Then create a variable of your first expression and plot it as the contour. |
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October 15, 2013, 06:25 |
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#3 | |
New Member
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Quote:
What I mean: I want to replicate this isocurves: this isocurves represent how much the wind speed changes around a building. If the inlet wind is 5m/s and after the wall the speed decrease to 1.5m/s then, the region is represented as an area with the a-dimensional number of 0.3 (1.5/5). If the area >1 that means the wind speed increases, if it is <1 the wind speed decreases. Now, I don't know how to write the expression for the the wind speed after and before the barrier. |
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October 15, 2013, 06:52 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,706
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Generate the CFD-Post variable as Lance suggests. This is quite simple to do, have a look at the tutorials if you need help on how to introduce post processing variables.
Then put a plane through your domain and generate a contour plot on the plane of your variable and that will generate the equivalent plot. |
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October 16, 2013, 06:39 |
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#5 |
Senior Member
OJ
Join Date: Apr 2012
Location: United Kindom
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On the same note, is it possible to show those values in different regions in the contour like the figure above? I tried once doing that but couldn't figure out how to do that.
OJ |
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October 16, 2013, 06:50 |
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#6 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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I think you have to do that manually using text objects. I cannot think of a way of doing it automagically.
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October 16, 2013, 07:18 |
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#7 | |
Senior Member
OJ
Join Date: Apr 2012
Location: United Kindom
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Quote:
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October 16, 2013, 17:26 |
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#8 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,706
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Not at all. It is a very useful term: http://www.urbandictionary.com/defin...=automagically
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