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Transient wall shear not available in CFD Post |
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March 20, 2015, 15:26 |
Transient wall shear not available in CFD Post
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#1 |
Member
NC
Join Date: Jan 2015
Posts: 49
Rep Power: 11 |
I took care to include Wall Shear as an extra variable to keep in Trn results, but when I tried to plot a contour at the transient time steps, nothing shows up (i.e. the wall is simply transparent). The same when I tried just the X,Y, or Z components. However, the contour does show when I choose the final time step. What is going on here? Thanks.
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March 21, 2015, 14:05 |
A clue
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#2 |
Member
NC
Join Date: Jan 2015
Posts: 49
Rep Power: 11 |
I hope this is a clue as to why the Wall Shear is not available in my transient results, although it hasn't helped me. I set a monitor point for various variables in a transient run and the Wall Shear ones are excluded. I suspect the Wall Shear requires a somewhat different treatment than do most variables because it exists only on the wall, but how? I have verified that my specified location is indeed on the wall.
Code:
Monitor Point: WSS Domain: Default Domain User specified location (r,t,a) : 2.574E-03, 5.236E-01, 2.100E-02 User specified location (x,y,z) : 2.229E-03, 1.287E-03, 2.100E-02 Excluded variables from output variable list: Wall Shear X Wall Shear Y Wall Shear Z Valid variables from output variable list: Velocity u Velocity v Velocity w |
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February 24, 2021, 03:43 |
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#3 |
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Non-US/Non-Canadian
Join Date: May 2015
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Hi,
I have the same problem. Do you know how to solve this problem? Thanks in advance. Regards, Mehrdad |
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February 24, 2021, 04:45 |
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#4 |
Senior Member
M
Join Date: Dec 2017
Posts: 703
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Sometimes its a bit tricky. I had a similar case once, where a derived variable didn't show, because another variabel was missing. You need the velocity gradient to calculate wall shear, so I suppose including it in trn files will enable Post to calculate wall shear.
Haven't used CFX in a while, so not sure if it can be included from the variable list. |
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February 24, 2021, 11:58 |
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#5 |
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Woud you mind showing the output control setup for the transient file you requested?
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