vortex shedding frequency

December 27, 2005, 05:36

Hi all,

I'am a fluent user and meanwhile doing validation cases on the 3D ahmed body. How can I find the vortex shedding frequency and related strouhal number by cfd. should I have to learn UDF for this reason or is there an easier way? thank a lot

Erdem

December 30, 2005, 18:31

Take the FFT (located in the plot drop down menu) of the Cd history. The peak freq. should be twice the shedding frequency. Then plug 1/2 peak freq. into str.# formula. I've used this method for shedding from normal 2D flat plates and cylinders with success.

December 27, 2005, 05:36	vortex shedding frequency	#1
Erdem Guest Posts: n/a	Hi all, I'am a fluent user and meanwhile doing validation cases on the 3D ahmed body. How can I find the vortex shedding frequency and related strouhal number by cfd. should I have to learn UDF for this reason or is there an easier way? thank a lot Erdem

December 30, 2005, 18:31	Re: vortex shedding frequency	#2
Mike Guest Posts: n/a	Take the FFT (located in the plot drop down menu) of the Cd history. The peak freq. should be twice the shedding frequency. Then plug 1/2 peak freq. into str.# formula. I've used this method for shedding from normal 2D flat plates and cylinders with success.

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