[FMDenaro]

Originally Posted by wanghaojie

i am wondering can i get real velocity from energy spectrum function (frequency domain), which can have a form like sinusoid function?
Can i set temporal difference equal to zero in the autocorrection function?
In this way i think i can only get the mean value of u_i square. or is there any other way?
Thanks

is your spectrum derived from a temporal signal? In general, you can construct a velocity field in space with a prescribed spectrum, however you need to prescribe other condition in order to construct all the Fourier coefficients