frequency of vortex shedding

HaKu · March 16, 2011, 11:07

hey

can anybody tell me how can i calculate the frequency of vortex shedding... i am not using any software but have developed the code in FORTRAN... and i am analysing the flow over a cylinder.... i have all the results and code is working fine... just need to know how to calculate the vortex shedding as need to validate this ..

Thanksss

pradeap · March 16, 2011, 15:26

The frequency of vortex shedding is calculated by taking the Fast fourier transform of the Lift coefficient, which will directly give the value T and f=1/T

This is the method followed in most of the literature.

ak6g08 · March 17, 2011, 07:04

look up the strouhal number as well, this is a more useful non-dimensional measure of vortex shedding frequency

good luck

titanic12 · March 18, 2011, 01:00

Hi,
At first we plot the graph “CL vs physical time”. The graph shows that CL varies periodically with respect to physical time. We can measure the periodic time (T) based on this graph.
Then, can we determine the frequency of vortex shedding (f) based on the periodic time (T): f = 1/T?
Best regards,
Dave

March 16, 2011, 11:07	frequency of vortex shedding	#1
HaKu Senior Member Hassan Join Date: Apr 2009 Posts: 106 Rep Power: 17	hey can anybody tell me how can i calculate the frequency of vortex shedding... i am not using any software but have developed the code in FORTRAN... and i am analysing the flow over a cylinder.... i have all the results and code is working fine... just need to know how to calculate the vortex shedding as need to validate this .. Thanksss

March 17, 2011, 07:04		#3
ak6g08 Member Akour Join Date: May 2009 Posts: 79 Rep Power: 17	look up the strouhal number as well, this is a more useful non-dimensional measure of vortex shedding frequency good luck __________________ akour

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March 16, 2011, 15:26		#2
pradeap New Member kumar Join Date: Jun 2010 Posts: 20 Rep Power: 16	The frequency of vortex shedding is calculated by taking the Fast fourier transform of the Lift coefficient, which will directly give the value T and f=1/T This is the method followed in most of the literature.

March 18, 2011, 01:00		#4
titanic12 New Member Dave Join Date: Mar 2011 Posts: 2 Rep Power: 0	Hi, At first we plot the graph “CL vs physical time”. The graph shows that CL varies periodically with respect to physical time. We can measure the periodic time (T) based on this graph. Then, can we determine the frequency of vortex shedding (f) based on the periodic time (T): f = 1/T? Best regards, Dave