[Nadeem99]

Hi All!
I am trying to compute spanwise wavenumber,kz for premultilpied spectra of streamwise veloity. I have spanwise length of Lz = 80 and node points, Nz = 256.

How can I calculate spanwise wavenumber,kz ?

Any help will be appriciated.

[FMDenaro]

Originally Posted by Nadeem99

Hi All!
I am trying to compute spanwise wavenumber,kz for premultilpied spectra of streamwise veloity. I have spanwise length of Lz = 80 and node points, Nz = 256.

How can I calculate spanwise wavenumber,kz ?

Any help will be appriciated.

Are you talking about the maximum wavenumber? in general the frequency is linked to the wavenumbers:

fz = kz * Lz/2*pi

and the Nyquist frequency will be fx_max= Lz/(2*h) so than

1/(2*h)= kz_max /2*pi

kz_max = pi/h

[Nadeem99]

Originally Posted by FMDenaro

Are you talking about the maximum wavenumber? in general the frequency is linked to the wavenumbers:

fz = kz * Lz/2*pi

and the Nyquist frequency will be fx_max= Lz/(2*h) so than

1/(2*h)= kz_max /2*pi

kz_max = pi/h

Thank you for your response. I want to calculate all wave numbers from minimum to maximum.

I want to conform one thing. Does 'h' refers to span-wise spacing?

Once again thanks for your response.

[FMDenaro]

Originally Posted by Nadeem99

Thank you for your response. I want to calculate all wave numbers from minimum to maximum.

I want to conform one thing. Does 'h' refers to span-wise spacing?

Once again thanks for your response.

yes, h stands for dz in your case

[Nadeem99]

Thanks a lot for your help.