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Confusion about the turbulence spectrum used in DNS study.

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Old   June 22, 2018, 05:03
Default Confusion about the turbulence spectrum used in DNS study.
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Junqian CAI
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Hello everyone!
I am interested in DNS study of turbulence and combustion. I am confused about the turbulence spectrum of Passot-Pouquet(1987) used in DNS study (Yoo).
In DNS study, the initial turbulent velocity is generated according to the spectrum present by Passot-Pouquet(1987), which looks like E(k)=A(k/k0)^4exp(-(k/k0)^2). This equation is different from the Kolmogorov’s −5/3 law. And they are look very different in same picture attached copy from a thesis.
My question is that why not use the spectrum of well known Kolmogorov’s −5/3 law in DNS study instead of use the spectrum proposed by Passot-Pouquet?
Any help would be appreciate.
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dns, kolmogorov’s, passot-pouquet, turbulence

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