[Nek5000-users] Applying multiple flux boundary conditions

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

Hi Daniel,

you want to use the ‘ifield’ index that is 1 for velocity field and 2 for temperature field. Your usrbc subroutine would look like:

      if (ifield.eq.1) then
YOUR BC FOR VELOCITY
      else
YOUR BC FOR TEMPERATURE
      endif

if you only solve for velocity and temperature fields.

Marco

On Jan 22fd, 2018, at 3:58 AM, nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov> wrote:

Hi all,

I'm trying to apply both temperature and velocity flux boundary conditions at one of my boundaries.  I am unsure, however, how to apply this in userbc in the usr file.  I can set one of the two by having an 'f' in the box file (for just one variable) and then defining 'flux =' in userbc.  How do I do this for both temperature and velocity?  Is there separate term for flux for temperature and flux for velocity?

Best,

Daniel Ward

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