CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

Time Averaged Shear Stress

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   May 17, 2012, 02:56
Default
  #21
Member
 
Naimah
Join Date: Nov 2011
Posts: 58
Rep Power: 5
wanna88 is on a distinguished road
Hi Lance,

"Say that you have calculated TAWSS in excel/matlab and know the value at each coordinate. Then, in CFD-post goto file/export and export any variable (say e.g. velocity) at the wall of interest. Check "line and face connectivity" and you'll get a file with coordinates and the variable + face connectivity.
Now, simply replace the variable you exported with your calculated values of TAWSS, and then import the file as a user surface.
Nope, whatever you name your variable to in the .csv-file will show up in the variables list in post.
No need for CFX-pre at all. "

Based on the above, I have calculated the TAWSS in excel. Then, in the CFD post, I load results of my fluent at 1 time point. Then, in the CFD post, I go to the file/export and export wall shear at the wall part. I also check line and face connectivity.
Then, I replaced the value of wall shear stress into TAWSS and then import back the file as a user surface.
then the variable in the csv file show up in the variable list in post. When I checked the imported file, seems nothing happen.

Is there any mistake in my steps?

Thank you.

Regards,
Naimah
wanna88 is offline   Reply With Quote

Old   May 21, 2012, 02:45
Default
  #22
Senior Member
 
Lance
Join Date: Mar 2009
Posts: 533
Rep Power: 11
Lance is on a distinguished road
If the variable shows up in the list it should work. Could you give an example on the data you import to post?
Lance is offline   Reply With Quote

Old   May 21, 2012, 03:40
Default
  #23
Member
 
Naimah
Join Date: Nov 2011
Posts: 58
Rep Power: 5
wanna88 is on a distinguished road
Hi Lance,

I have imported the data in .csv file. there is X, Y, Z and wall shear stress value. There are 2 cases in .csv file. I changed the values of WSS to the TAWSS.
Actually in my CFD post there are 2 cases in which is cases 4.20 at 5 s and cases 4.20 at 4.20 s.
I only want to look at case 4.20 at 4.20 s.
However in the excel, this two cases are together.

When I imported into CFD post, the 2 cases separated.

Is there anything wrong?

Thank you.

Regards,
Naimah
Attached Images
File Type: jpg image1.jpg (94.9 KB, 5 views)
File Type: jpg image 2.jpg (95.9 KB, 6 views)
wanna88 is offline   Reply With Quote

Old   May 21, 2012, 04:08
Default
  #24
Senior Member
 
Lance
Join Date: Mar 2009
Posts: 533
Rep Power: 11
Lance is on a distinguished road
I havent tried two cases at the same time, so I dont know if that works. Try to remove the case you dont need.
Also, I wouldnt use spaces in the variable names.
Lance is offline   Reply With Quote

Old   May 21, 2012, 04:29
Default
  #25
Member
 
Naimah
Join Date: Nov 2011
Posts: 58
Rep Power: 5
wanna88 is on a distinguished road
"Also, I wouldnt use spaces in the variable names"

Sorry, which spaces did you refered?
I don get it.
wanna88 is offline   Reply With Quote

Old   May 21, 2012, 04:32
Default
  #26
Senior Member
 
Lance
Join Date: Mar 2009
Posts: 533
Rep Power: 11
Lance is on a distinguished road
The variable name seems to be "wall part_1 in Case FFF 1 00420"
Lance is offline   Reply With Quote

Old   June 11, 2012, 01:19
Default
  #27
Member
 
Naimah
Join Date: Nov 2011
Posts: 58
Rep Power: 5
wanna88 is on a distinguished road
Hi Lance,

I m not successful plotting time average wall shear stress in the CFD post.
Herewith I attached the steps taken.
Can you help me to look into it?

Thank you.

Regards,
Naimah
Attached Images
File Type: jpg step 1.jpg (91.0 KB, 7 views)
File Type: jpg step 2.jpg (87.2 KB, 6 views)
File Type: jpg step 3.jpg (91.7 KB, 7 views)
File Type: jpg step 4.jpg (96.5 KB, 6 views)
File Type: jpg step 5.jpg (72.5 KB, 5 views)
wanna88 is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
How to write k and epsilon before the abnormal end xiuying OpenFOAM Running, Solving & CFD 8 August 27, 2013 15:33
Full pipe 3D using icoFoam cyberbrain OpenFOAM 4 March 16, 2011 10:20
Post processing - Wall shear stress Carlo CD-adapco 1 March 4, 2009 08:35
Re: About wall shear stress Mike FLUENT 9 November 17, 2003 15:41
Specifying shear stress on wall in 5.5.1 michael rasmussen CFX 1 May 19, 2003 09:49


All times are GMT -4. The time now is 11:49.