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Grid resolved convection, or grid scale noise?

PostPosted: Sun Jun 12, 2016 9:06 pm
by sss
Hi,
I'm trying to determine if this is grid resolved convection, or grid scale noise.
This is a plot of max vertical velocity. Colors are +/- 50fpm. The peak to peak distance is approximately 2*dx, which makes me suspect noise. dx is 4km.
Image

Re: Grid resolved convection, or grid scale noise?

PostPosted: Sat Oct 15, 2016 1:39 pm
by BHajni
Hi,


Definitely a noise. a) You should reduce time step or use adaptive time step, b) use the diff_6th_opt option. The latter one is a cosmetic solution as it smooths out the disturbances. But the first should resolve some of this issue.

Cheers,
Hajni