CFD Online Discussion Forums

CFD Online Discussion Forums (https://www.cfd-online.com/Forums/)
-   CFX (https://www.cfd-online.com/Forums/cfx/)
-   -   Transient wall shear not available in CFD Post (https://www.cfd-online.com/Forums/cfx/150371-transient-wall-shear-not-available-cfd-post.html)

bongbang March 20, 2015 14:26
Transient wall shear not available in CFD Post
 
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.

bongbang March 21, 2015 13:05
A clue
 
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

Mkalantar February 24, 2021 02:43
Hi,

I have the same problem. Do you know how to solve this problem?

Thanks in advance.

Regards,
Mehrdad

AtoHM February 24, 2021 03:45
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.

Opaque February 24, 2021 10:58
Woud you mind showing the output control setup for the transient file you requested?


All times are GMT -4. The time now is 06:22.