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February 10, 2016, 11:08 |
Expression for uniform flow
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#1 |
New Member
Arjun Brueck
Join Date: Jan 2016
Posts: 1
Rep Power: 0 |
Hello,
I'm modelling an exotic diffusor with high opening angle. Within a parametric study I want wo find a configuration with the most uniform velocity profile at the outlet of the diffusor. To compare different configurations, I thought about something like standard deviation and tried 'areaave(velocity.diversity)@<location>' as an expression, but I get [s^-1] as a dimension whereas I expected a dimensionless result. In the CFX-Refernce Guide I do not finde any documentation for the velocity.<subexpressions>. So the question is: Is there a Ansys expression to get the unifomity of the veolocity profile or do I have have to do the job with an external program? I'm using Ansys 13 Thank you for any answer, Kind regards, Arjun |
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February 10, 2016, 17:31 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
I don't know if this will work, but can you do something like:
rmsAve((u-areaAve(u)@location)@location |
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February 10, 2016, 21:05 |
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#3 |
Senior Member
Join Date: Jun 2009
Posts: 1,804
Rep Power: 32 |
Keep in mind that such expression may only work in CFD-Post.
In the ANSYS CFX Solver, you must split the expression in parts such as Create an algebraic additional boundary only variable, MyBdyAV = u - areaAve(u)@location MyUniformity = rmsAve(MyBdyAV)@location Hope Glenn's suggestion works for you on either the solver, or post. |
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