a little smaller Strouhal number

Maimouna · March 20, 2014, 07:25

Dear KKpal and Philiph,

many thanks for your posts. I'm working with the same problem about flow past a circular cylinder. I would like to know to what St number my case is converged. What shall I add in my files to know that?

I am simulating flow around cylinder at Re=100.

my case setup is like this:
D=1, U=1, nu=0.01, no turbulence model.

I'm looking forward your help please

Maimouna · March 20, 2014, 07:37

Sorry, I forgot to attach my case in the previous post.

RodriguezFatz · March 20, 2014, 07:41

Maimouna, you need to measure the frequency! Get any value that shows you the frequency, such as pressure at some point, or the force on the cylinder, velocity at some point... and plot this over time. Now you can just calculate Strouhal number. Since D and u=1 the frequency (in Hz) is the Strouhal number in your case.

Maimouna · March 20, 2014, 08:36

Many thanks for your prompt reply.

Do you mean that I could get it by using plotOverLine?

Could you explain more please?

RodriguezFatz · March 25, 2014, 06:44

I don't know which tool you use (Fluent, Openfoam, CFX, ...).

Maimouna · March 25, 2014, 06:48

Many thanks Philipp. I got it. I'm using OpenFOAM tool.

March 20, 2014, 07:41		#23
RodriguezFatz Senior Member Philipp Join Date: Jun 2011 Location: Germany Posts: 1,297 Rep Power: 26	Maimouna, you need to measure the frequency! Get any value that shows you the frequency, such as pressure at some point, or the force on the cylinder, velocity at some point... and plot this over time. Now you can just calculate Strouhal number. Since D and u=1 the frequency (in Hz) is the Strouhal number in your case. __________________ The skeleton ran out of shampoo in the shower.

March 25, 2014, 06:44		#25
RodriguezFatz Senior Member Philipp Join Date: Jun 2011 Location: Germany Posts: 1,297 Rep Power: 26	I don't know which tool you use (Fluent, Openfoam, CFX, ...). __________________ The skeleton ran out of shampoo in the shower.

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March 20, 2014, 07:25		#21
Maimouna Senior Member ok Join Date: Oct 2013 Posts: 346 Rep Power: 13	Dear KKpal and Philiph, many thanks for your posts. I'm working with the same problem about flow past a circular cylinder. I would like to know to what St number my case is converged. What shall I add in my files to know that? I am simulating flow around cylinder at Re=100. my case setup is like this: D=1, U=1, nu=0.01, no turbulence model. I'm looking forward your help please

March 20, 2014, 08:36		#24
Maimouna Senior Member ok Join Date: Oct 2013 Posts: 346 Rep Power: 13	Many thanks for your prompt reply. Do you mean that I could get it by using plotOverLine? Could you explain more please?

March 25, 2014, 06:48		#26
Maimouna Senior Member ok Join Date: Oct 2013 Posts: 346 Rep Power: 13	Many thanks Philipp. I got it. I'm using OpenFOAM tool.