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-   -   Flow past an oscillating cylinder (Strouhal number) (https://www.cfd-online.com/Forums/main/124991-flow-past-oscillating-cylinder-strouhal-number.html)

 o_mars_2010 October 16, 2013 23:50

Flow past an oscillating cylinder (Strouhal number)

I am doing a simulation for flow past an Oscillating Cylinder. I would like to confirm from some definitions:

If the harmonic motion of the cylinder is given by:

y=A*cos(2*pi*Fe*t)
0.8<=Fe/Fo<=1.2

where:
y location of cylinder center
A amplitude of oscillation
Fe Oscillation frequency
Fo natural shedding frequency

if Strouhal number St = 0.195 = Fo*D/U

my question is:
Does Fo will be equal to 0.195 if i used the nondimensional values of D and U (D=U=1) , or i have to calculate it using the real values of D and U ??

 engr January 3, 2014 10:55

Yes, Fo=0.195 in this case

 Maimouna May 22, 2014 11:50

Dear Osman,

I'm working for the same case that you posted? Did you get results for your case?

 engr May 22, 2014 23:07

Dear Maimouna,

I did simulation for forced oscillation of cylinder using ANSYS Fluent. Are you looking for the forced oscillation or natural oscillation Case?

 Maimouna May 23, 2014 01:52

I'm looking for both. I already finished the forced case, but I'm still struggling in the natural one. Looking forward to get help from any volunteers.

Any idea my friend?

 engr May 23, 2014 02:11

Dear Maimouna,
We can share our cases for forced oscillation problem for comparison. And I am going to start about natural oscillation case and will let you know after completion.
Thanks

 Maimouna May 23, 2014 02:18

1 Attachment(s)

many thanks. My forced one is attached here. Looking forward to get your new case.

All the best

 engr May 23, 2014 02:39

Dear Maimouna,
I am having problem in file attachment, Can you send me your email ID. I will send an email to you.. thanks.

 Maimouna May 23, 2014 04:25

Thanks Sajjad. My email is: may78may@hotmail.com

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