Closed saikatxdas closed 2 years ago
Hi, @saikatxdas. No, sIndex is the slope of the omnidirectional energy spectrum: E(k) ~ k^(-s) e.g., s = 5/3 for Kolmogorov's, or s = 3/2 for Kraichnan's spectrum. While "alpha" is -(sIndex + 2), e.g., alpha = -(5/3 + 2) = -11/3 for Kolmogorov's. See:
The reason for this change in the signature is that "s" is more widespread in the literature than "alpha", especially in plasma physics. Most of people know what 5/3 is, while, -11/3 could be seen as a "derived" quantity.
Hi, I have a usage question. Does "alpha" in
initTurbulence
has the same signature as "sIndex" inSimpleTurbulenceSpectrum
? I am trying to set the value of "alpha" in <B^2(k)> ~ k^alpha to obtain a Kolmogorov spectrum. So should I put +11/3 or -11/3 for "sIndex" inSimpleTurbulenceSpectrum
?