Model?

prabulchandran · June 3, 2016, 06:14

I am doing analysis of flow past a rotating cylinder with Reynolds number below 2000. What is the best suit model for this problem? Whether i should use laminar model or should go for any turbulent model?

ghorrocks · June 3, 2016, 08:43

For a stationary cylinder the flow is laminar at Re=2000. So unless the rotation of your cylinder is extremely fast (enough to trip turbulence) you should be using a laminar model. Note that it will be shedding vorticies so you will need a transient model.

prabulchandran · June 6, 2016, 06:36

can you please suggest me the better turbulent model in case the flow becomes turbulent. Now i am using sst model. Whether i should try any other model?

ghorrocks · June 6, 2016, 07:26

I should put this up as an FAQ:

Unless you have a clear reason not to, you should use SST. You have not stated a clear reason to not use SST - so you should use SST.

prabulchandran · June 7, 2016, 05:02

thank you...

June 3, 2016, 06:14	Model?	#1
prabulchandran New Member Prabul Chandran Join Date: Nov 2015 Posts: 12 Rep Power: 11	I am doing analysis of flow past a rotating cylinder with Reynolds number below 2000. What is the best suit model for this problem? Whether i should use laminar model or should go for any turbulent model?

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June 3, 2016, 08:43		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	For a stationary cylinder the flow is laminar at Re=2000. So unless the rotation of your cylinder is extremely fast (enough to trip turbulence) you should be using a laminar model. Note that it will be shedding vorticies so you will need a transient model.

June 6, 2016, 06:36		#3
prabulchandran New Member Prabul Chandran Join Date: Nov 2015 Posts: 12 Rep Power: 11	can you please suggest me the better turbulent model in case the flow becomes turbulent. Now i am using sst model. Whether i should try any other model?

June 6, 2016, 07:26		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	I should put this up as an FAQ: Unless you have a clear reason not to, you should use SST. You have not stated a clear reason to not use SST - so you should use SST.

June 7, 2016, 05:02		#5
prabulchandran New Member Prabul Chandran Join Date: Nov 2015 Posts: 12 Rep Power: 11	thank you...