Possible CFL mistake in NL terms?

[David Dickinson]

In nonlinear terms we calculate the cfl limit in x and y from the real space potential gradients. For example:

https://bitbucket.org/gyrokinetics/gs2/src/e29e9ab8f2eb8d01292fee68588b8bbed560e00b/src/nonlinear_terms.fpp#lines-844

Note here we pass cfly after calculating i kx chi and cflx after calculating i ky chi. Maybe I’m missing something obvious, but I think this is probably the wrong way around? Any thoughts @Colin Malcolm Roach ?

[David Dickinson]

Ah yes of course, should have thought about it for five more minutes. The velocity ~ v_ExB → The x-component of the velocity uses E_y

[David Dickinson]

Incorrect issue, just needed a second of thought.

[Colin Malcolm Roach]

Yes you got it before I got to your message!

v=grad(chi) x B

[David Dickinson]

Yes, sorry to waste your time on this – should be quite obvious!