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How to separate two waves in my simulation result?

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Old   October 13, 2009, 00:42
Default How to separate two waves in my simulation result?
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I am simulating the waves propagating in the boundary layer. In my output result, Fourier analysis shows that there are two wave peaks. The difficulty is that I do not know exactly these two wavenumbers in advance. Then how can I inverse these two waves separately to physical space? Are there any filter function in Matlab or Fortran can do this?

Thank you very much.
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