[Nek5000-users] Specifying the Froude Number

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

I guess the Froude number and the way to exactly specify it depends on 
the scaling of your equations. Your numbers indicate that your gravity 
is in the x/y plane, 4 degrees off the x axis?

But in principle, this is the correct place, you just need to add the 
correct factor in front of "temp". I suggest also to use a cos/sin for 
specifying the direction (if I understand your code).

Philipp



On 2017-11-23 18:05, nek5000-users at lists.mcs.anl.gov wrote:
> Hi All,
> 
> 
> I'm trying to work out how to specify the Froude number in my simulation 
> of a buoyant plume.  I can specify Reynolds and Peclet in the .rea file 
> but there doesn't seem to be anywhere analogous for Fr.  I thought it 
> might be in the .usr function in the subroutine userf, mine currently 
> looks like this:
> 
> 
>        subroutine userf  (ix,iy,iz,iel)
>        include 'SIZE'
>        include 'TSTEP'
> c     include 'TOTAL'
>        include 'NEKUSE'
> 
>        integer e,f,eg
> 
>        ffx = -0.06976*temp
>        ffy = 0.9976*temp
>        ffz = 0.0
> 
>        return
>        end
> 
> 
> Does anyone have any idea (if this is the correct place, and) how I can 
> specify Fr here.  I also want to ensure gravity is in the correct 
> direction (namely, towards the floor), and how does what I have at the 
> moment do this?  My simulation outputs do have gravity in the correct 
> direction, so it must be correct.
> 
> 
> Thank you in advance.
> 
> 
> Best,
> 
> 
> Daniel
> 
> 
> 
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