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John February 17, 2005 20:15

Laminar pipe flow
 
Hi,

Why do I get worse results compared whit analytical results when I refine the mesh? I'm simulating laminar pipe flow (Re=1400) and the residuls of all simulation are less then 1e-3. When I have a mesh with more cells the result seems to be of a turbulent flow. Thanks in advance. John

Randheer Yadav February 18, 2005 04:10

Re: Laminar pipe flow
 
please don't go for the residuals because they often create confusion. Better you check the results with analytical solutions. Here is one link of cornell university. You will find the "laminar flow in pipe". go through it and i hope u will be happy. http://instruct1.cit.cornell.edu/courses/fluent/ bye

John February 18, 2005 14:37

Re: Laminar pipe flow
 

John February 18, 2005 14:42

Re: Laminar pipe flow
 
Thanks Randheer but what I'd like to know is why my results are getting worse compared whit analytical whit a mesh whit more cells. I think it should be the oposite. Thanks.

Randheer Yadav February 22, 2005 03:38

Re: Laminar pipe flow
 
Have u attached boundary layer on the inner surface of the pipe?. If not then please try it. I think this should give u more accurate solution than making grids finer.

manivannan February 24, 2005 09:14

Re: Laminar pipe flow
 
how will be affect cavitation for this flow

and also difference between laminar and turbulent flow

arta December 5, 2014 06:00

Quote:

Originally Posted by Randheer Yadav
;118037
please don't go for the residuals because they often create confusion. Better you check the results with analytical solutions. Here is one link of cornell university. You will find the "laminar flow in pipe". go through it and i hope u will be happy. http://instruct1.cit.cornell.edu/courses/fluent/ bye

hi,
could you mail this file for me please? , i cant open it
thanks


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