[Nek5000-users] ffx ffy ffz in usr

[nek5000-users at lists.mcs.anl.gov]

Thai,

if you are referring to ffx, ffy and ffz from the usr file they are accelerations applied to the x, y and z momentum equations, respectively.

What is the meaning of u_t and u_b?

Marco


> On Jan 23, 2018, at 12:14 PM, nek5000-users at lists.mcs.anl.gov wrote:
> 
> Hi Nek,
> 
> Is there anyone know whether the ffx ffy and ffz are pressure gradient? And why it is set to be (u_t/u_b)^2 and sometimes set to be 0? What's difference between those curcumstance and what else we can do to let them to be equal?
> 
> Kind regards,
> 
> Zhai 
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