[Nek5000-users] userf/userq in .usr file

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

Hi Josh,

Yes, you are right that the variable SOURCE in userq seems to be outdated -- only qvol is used in nekuq().

As far as multiplication of ffx,... by masss matrix is concerned -- it's done in makeuf() (after calling nekuf() which calls userf()), so there is no need to do the multiplication in userf():


      subroutine makeuf
...
      CALL NEKUF   (BFX,BFY,BFZ)
      CALL OPCOLV (BFX,BFY,BFZ,BM1)


Best,
Aleks


----- Original Message -----
From: nek5000-users at lists.mcs.anl.gov
To: "nek5000-users" <nek5000-users at lists.mcs.anl.gov>
Sent: Tuesday, August 9, 2011 4:43:15 PM
Subject: [Nek5000-users] userf/userq in .usr file

Hello Neks,

I had a couple of questions regarding userf and userq.

1)  If we add something to, for example, ffx in userf, is that
"something" subsequently multiplied by the mass matrix later on in the
source code, or is that on the user to multiply ffx(i,j,k,e) by its
appropriate bm1 entry?

2)  In userq, is "source" used for anything?  I tried looking through
the source code, and I can see where "qvol" is used, but not where
"source" is used.


Thanks,

-- 
Josh Camp

"All that is necessary for the triumph of evil is that good men do
nothing" -- Edmund Burke
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