Hi,

I'm novice in DNS but have a pseudo-spectral code for channel flow. It simulates box with periodic bc in streamwise and spanwise direction. Quantities are expanded in Fourier modes in x and z dir and Chebyshev modes in y dir. I want to know how can I find the length and time resolution of the code ? It,s no LES. I would also appreciate related references.

Thanks

[beyonder]

I have just seen some of the relevant posts. I dont know if you are still interested in the Fourier-Chebyshev topic, but at the moment I am trying to code the same via Matlab.
So far I only have 2d case with three different impementation methods.
1- staggered grid [Canuto-2007]
2- Coupled [Canuto-2007]
3- Splitting method [R.Peyret-Spectral methods for incomp vis flow.]
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with these codes, Couette and Poiseuille flows seem to be working fine. I have two main questions for you;
1-First of all those two cases are fully developed to validate confidently do you have any other suggestion test cases, where solutions are known. There might be many but I would assume, only few would be ok for the periodic B.C.
2-I am pretty confused by stepping up to 3d. I might need some help if you would.
so if you email me back as an answer, I could give you more detailed explanation of the points I get stuck.
emre137@gmail.com
Thanks in advance
\Emre