# Flow past an oscillating cylinder (Strouhal number)

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 October 16, 2013, 23:50 Flow past an oscillating cylinder (Strouhal number) #1 Member   Osman Join Date: Oct 2012 Location: Japan Posts: 51 Rep Power: 6 Sponsored Links 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 ??
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 January 3, 2014, 10:55 #2 New Member   Sajjad Join Date: Mar 2009 Posts: 7 Rep Power: 10 Yes, Fo=0.195 in this case

 May 22, 2014, 11:50 #3 Senior Member   ok Join Date: Oct 2013 Posts: 346 Rep Power: 6 Dear Osman, I'm working for the same case that you posted? Did you get results for your case? If yes, could you please explain more about your case and results? Many thanks in advanced.

 May 22, 2014, 23:07 #4 New Member   Sajjad Join Date: Mar 2009 Posts: 7 Rep Power: 10 Dear Maimouna, I did simulation for forced oscillation of cylinder using ANSYS Fluent. Are you looking for the forced oscillation or natural oscillation Case?

 May 23, 2014, 01:52 #5 Senior Member   ok Join Date: Oct 2013 Posts: 346 Rep Power: 6 Dear Sajjad, 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?

 May 23, 2014, 02:11 #6 New Member   Sajjad Join Date: Mar 2009 Posts: 7 Rep Power: 10 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

May 23, 2014, 02:18
#7
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ok
Join Date: Oct 2013
Posts: 346
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Dear Sajjad,

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

All the best
Attached Files
 oscillatingCylinder.tar.gz (5.2 KB, 12 views)

 May 23, 2014, 02:39 #8 New Member   Sajjad Join Date: Mar 2009 Posts: 7 Rep Power: 10 Dear Maimouna, I am having problem in file attachment, Can you send me your email ID. I will send an email to you.. thanks.

 May 23, 2014, 04:25 #9 Senior Member   ok Join Date: Oct 2013 Posts: 346 Rep Power: 6 Thanks Sajjad. My email is: may78may@hotmail.com

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