CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   Main CFD Forum (http://www.cfd-online.com/Forums/main/)
-   -   frequency of vortex shedding (http://www.cfd-online.com/Forums/main/86186-frequency-vortex-shedding.html)

HaKu March 16, 2011 11:07

frequency of vortex shedding
 
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


All times are GMT -4. The time now is 03:29.