[Nek5000-users] Further to the issue of ffx, ffy and ffz

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

Hi,

May I push the following question further? Is there anyone know what are
the exact meaning for para(54) and (55) in rea file? Such as, what's the
difference between: 0,0 and -3 1 for (54) and (55) respectively? what's
meaning for sign (+) or (-)?

Kind regards,

Zhai


Hi Philipp,

Yes, they are shear velocity and bulk velocity. Can I say if the ffx, ffy
or ffz equal to (u_t/u_b)^2, the flow is specified as a fixed pressure
gradient in the channel, and parameter(54) and para(55) in rea file are
fixed as 0. Otherwise, if the all ffx, ffy and ffz are 0, the flow is fixed
at flow rate rather than pressure gradient?

Cheers,

Zhai
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