Flow around cylinder using SIMPLE scheme

bikooo3878 · October 16, 2018, 06:57

Hello,

I know questions like mine are frequently asked. But I've tried searching well before posting my question.

I'm trying to simulation a 2-D flow around cylinder at a fairly high Re=1500. I know that at this number there shouldn't be vortex shedding behind the cylinder. However, even though my mesh is (suitably) fine, with inflation around the cylinder and using the default UR factors (and some times smaller values), the flow won't stabilize using SIMPLE scheme.

When I try the same turbulence model (k-e), mesh and BCs using coupled scheme, the result converges quickly and the results are quite reasonable.

My question is, how can I make sure the SIMPLE scheme is providing correct results? I'm only testing it around a cylinder because I know how it should behave.

Thank you in advance.

Leonardo.flores · October 17, 2018, 04:25

There will be vortices from Reynolds equal to 50. From 50 to 200 there is laminar vortex shedding. Higher Reynolds are turbulent. You must read the papers from Rosetti. In resume, I would suggest you to use simple method unsteady and keep a Courant number around 1 to 10.
Also you can try non iterative methods such as Fractional Step. Compare them and you should get same results.

October 16, 2018, 06:57	Flow around cylinder using SIMPLE scheme	#1
bikooo3878 Member Mostafa Join Date: Sep 2016 Posts: 30 Rep Power: 10	Hello, I know questions like mine are frequently asked. But I've tried searching well before posting my question. I'm trying to simulation a 2-D flow around cylinder at a fairly high Re=1500. I know that at this number there shouldn't be vortex shedding behind the cylinder. However, even though my mesh is (suitably) fine, with inflation around the cylinder and using the default UR factors (and some times smaller values), the flow won't stabilize using SIMPLE scheme. When I try the same turbulence model (k-e), mesh and BCs using coupled scheme, the result converges quickly and the results are quite reasonable. My question is, how can I make sure the SIMPLE scheme is providing correct results? I'm only testing it around a cylinder because I know how it should behave. Thank you in advance.

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October 17, 2018, 04:25		#2
Leonardo.flores Member Leonardo Join Date: Nov 2017 Posts: 37 Rep Power: 9	There will be vortices from Reynolds equal to 50. From 50 to 200 there is laminar vortex shedding. Higher Reynolds are turbulent. You must read the papers from Rosetti. In resume, I would suggest you to use simple method unsteady and keep a Courant number around 1 to 10. Also you can try non iterative methods such as Fractional Step. Compare them and you should get same results.