Hi I am trying to develop a script for Bessel functions for a given data set to determine modes of vibrations in pipes. My project is Flow induced vibrations in pipes, My geometry is a 90 degree mitred pipe section. I have to determine the point in the elbow where circumferential modes change to lateral mode once the flow has changed direction at the 90 degree section. I have got my pressure fluctuation data out of computational fluid dynamics and imposed in Ansys structural. Now I have two types of data,
Frequency vs magnitude for fluid fluctuating pressure Displacement values for structure against time and their frequency vs magnitude using FFT
I am stuck at Bessel functions. I am trying to develop a script in Matlab for my data so that I can get mode shapes for different sections of pipe. I do not understand how to use my data from structural and apply Bessel functions on it so that I can see which section of pipe is undergoing which mode shape. This is my first time with Bessels. Can you help. Regards,