How to calculate the axial velocity dispersion in CFD-Post?

mayj · February 18, 2015, 19:10

Hello everyone
Can anybody tell me how to calculate the axial velocity dispersion in cfd (computational fluid dynamic) post? CFD calculator calculates the average and volume average of the velocity. To calculate the total velocity dispersion in the BC (bubble column), I multiplied the average to the volume, but the value was too small and didn’t match the empirical data, then I calculated the Volint in the post calculator, but still too small. Please advise.
Cheers

ghorrocks · February 18, 2015, 21:31

What is axial velocity dispersion? What is the empirical data you are trying to match?

mayj · February 19, 2015, 20:02

Hi Glen

Basically, I want to calculate the axial liquid velocity along the pipe column using CFX result files.

Thanks

ghorrocks · February 19, 2015, 20:04

Put a line object along the pipe, then you can chart velocity along this line or export it or do anything else with it.

mayj · February 20, 2015, 02:04

Thanks it worked perfectly.

February 18, 2015, 19:10	How to calculate the axial velocity dispersion in CFD-Post?	#1
mayj Member may Join Date: Jul 2013 Posts: 31 Rep Power: 13	Hello everyone Can anybody tell me how to calculate the axial velocity dispersion in cfd (computational fluid dynamic) post? CFD calculator calculates the average and volume average of the velocity. To calculate the total velocity dispersion in the BC (bubble column), I multiplied the average to the volume, but the value was too small and didn’t match the empirical data, then I calculated the Volint in the post calculator, but still too small. Please advise. Cheers

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February 18, 2015, 21:31		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	What is axial velocity dispersion? What is the empirical data you are trying to match?

February 19, 2015, 20:02		#3
mayj Member may Join Date: Jul 2013 Posts: 31 Rep Power: 13	Hi Glen Basically, I want to calculate the axial liquid velocity along the pipe column using CFX result files. Thanks

February 19, 2015, 20:04		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	Put a line object along the pipe, then you can chart velocity along this line or export it or do anything else with it.

February 20, 2015, 02:04		#5
mayj Member may Join Date: Jul 2013 Posts: 31 Rep Power: 13	Thanks it worked perfectly.