Wall shear stress gradient udf

March 8, 2006, 23:19

Hi,

I need to calculate the wall shear stress gradient in a UDF, does anybody know how to do this?

Any help would be greatly appreciated,

Cheers, Andrew.

Azi Lotfi · April 2, 2018, 23:03

Hello everyone

I know I'm posting on an outdated thread, but though maybe this is the most relevant post to my inquiry.

The thing is I need to calculate Time Averaged Wall Shear Stress Gradient for a transient simulation (TAWSSG) within a artery and have been searching for a while on a net and checked out a few tutorials, but couldn't find any proper guides on how to write a udf for it.

Is there any professionals here able of helping me on calculating TAWSSG preferably with using udf?

Cheers and thank you in advance

Azi

AlexanderZ · April 3, 2018, 01:33

Did you try to use "Data Sampling for Time Statistics" option in "run calculation" tab?
If no, use google to find information about it, may be it will be enough for your case

best regards

Azi Lotfi · April 4, 2018, 02:36

Data sampling only gives me the time-avareged WSS vector while I need to calculate two parameters: (i) the average of |WSSG| which means first calculating the magnitude of WSSG and then average, (ii) the average of WSSG vector which means first finding the WSSG vector/matrix out of WSS and then time-average.

Any suggestions on how to do this in post-processing/udf?

March 8, 2006, 23:19	Wall shear stress gradient udf	#1
Andrew Guest Posts: n/a	Hi, I need to calculate the wall shear stress gradient in a UDF, does anybody know how to do this? Any help would be greatly appreciated, Cheers, Andrew.

April 2, 2018, 23:03	UDF to calculate Wall shear stress gradient	#2
Azi Lotfi New Member miss001 Join Date: Aug 2014 Posts: 5 Rep Power: 12	Hello everyone I know I'm posting on an outdated thread, but though maybe this is the most relevant post to my inquiry. The thing is I need to calculate Time Averaged Wall Shear Stress Gradient for a transient simulation (TAWSSG) within a artery and have been searching for a while on a net and checked out a few tutorials, but couldn't find any proper guides on how to write a udf for it. Is there any professionals here able of helping me on calculating TAWSSG preferably with using udf? Cheers and thank you in advance Azi

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Natural convection in a closed domain STILL NEEDING help!	Yr0gErG	FLUENT	4	December 2, 2019 01:04
Accessing wall shear stress using UDF	Robert	Fluent UDF and Scheme Programming	2	July 31, 2013 09:34
Re: About wall shear stress	Mike	FLUENT	9	November 17, 2003 15:41
shear stress scalar definitions?	Novak Elliott	CFX	0	April 6, 2003 02:45
Wall shear stress in a UDF	Jafri	FLUENT	3	December 6, 2002 18:29

April 3, 2018, 01:33		#3
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	Did you try to use "Data Sampling for Time Statistics" option in "run calculation" tab? If no, use google to find information about it, may be it will be enough for your case best regards

April 4, 2018, 02:36		#4
Azi Lotfi New Member miss001 Join Date: Aug 2014 Posts: 5 Rep Power: 12	Data sampling only gives me the time-avareged WSS vector while I need to calculate two parameters: (i) the average of \|WSSG\| which means first calculating the magnitude of WSSG and then average, (ii) the average of WSSG vector which means first finding the WSSG vector/matrix out of WSS and then time-average. Any suggestions on how to do this in post-processing/udf?