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Forum: Main CFD Forum

December 13, 2011, 12:35

Replies: 4

DNS: how to compute nonlinear term in the spectral kinetic energy equation

Views: 1,980

Posted By magicsquirrel

Yes probably doing this pseudo-spectrally is the...

Yes probably doing this pseudo-spectrally is the best way.
Something like that:

1) (u.grad).u
2) FFT((u.grad).u)
3) P(FFT((u.grad).u))
4) FFT(u).P(FFT((u.grad).u))

Forum: Main CFD Forum

December 8, 2011, 13:40

Replies: 4

DNS: how to compute nonlinear term in the spectral kinetic energy equation

Views: 1,980

Posted By magicsquirrel

DNS: how to compute nonlinear term in the spectral kinetic energy equation

Dear CFD Onliner,
What is the best way to compute the nonlinear term in the spectral kinetic energy equation in tri-periodic Fourier DNS code ?
I mean the T(k)=-i sum_{k+p+q=0} P_ijm(k) u_j(p)...

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