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

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

On 2018-03-23 19:25, nek5000-users at lists.mcs.anl.gov wrote:
> Hi Paul,
> 
> Thanks for your reply regarding on the questions of  ''Further to the 
> issue of ffx, ffy and ffz''. May I ask you if I keep p54=-3, p55=1, will 
> the fluid be changed if ffx not eqauls to 0 (supposed x is streamwise 
> direction) in the same time?
> 
> And dear Philipp,
> 
> May I know what you ususally set for the pipe flow if p54 and p55 are 
> not used, fixing flow rate or fixing pressure gradient? and how you do 
> you set if the flow considering the interaction between fluid and 
> particles for the two-phase flow?

Hi,
we typically set fixed mass flux, using p54 and p55; sometimes with some 
variants of it when the geometry requires it. Fixed pressure gradient is 
typically quite slow in adapting to a given value for the friction 
(Reynolds number).

For two-phase flow we usually do not change anything.
Philipp


> 
> Kind regards,
> 
> Zhai
> 
> 
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