[Nek5000-users] How to give NEK5000 boundary conditions to exodus mesh file

Thu May 31 08:12:55 CDT 2018

I do not think this method supports periodic boundary conditions. You will have to replace the periodic boundary conditions with wall boundary conditions and see it is runs.

Marco

On May 31, 2018, at 9:11 AM, nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov> wrote:

Hi Marco,

I tried and it compiled . But before starting the time step it failed.
Its a very simple case, the water flowing throgh a cube. So I have inlet, outlet, walls on upside and bottom and periodic conditions on side walls.
I get this error:

Matrix:   0 aa         6       6       6
  0 aa     8.33333E+01  -4.87842E+01   0.00000E+00   0.00000E+00   0.00000E+00   0.00000E+00
  0 aa    -4.87842E+01   8.66667E+01  -4.87842E+01   7.11752E+00  -1.66667E+00   0.00000E+00
  0 aa     0.00000E+00  -4.87842E+01   8.33333E+01  -4.16667E+01   7.11752E+00   0.00000E+00
  0 aa     0.00000E+00   7.11752E+00  -4.16667E+01   8.33333E+01  -4.87842E+01   0.00000E+00
  0 aa     0.00000E+00  -1.66667E+00   7.11752E+00  -4.87842E+01      Infinity     -Infinity
  0 aa     0.00000E+00   0.00000E+00   0.00000E+00   0.00000E+00     -Infinity      Infinity

Matrix:   0 bb         6       6       6
  0 bb     4.16667E-02   0.00000E+00   0.00000E+00   0.00000E+00   0.00000E+00   0.00000E+00
  0 bb     0.00000E+00   1.66667E-02   0.00000E+00   0.00000E+00   0.00000E+00   0.00000E+00
  0 bb     0.00000E+00   0.00000E+00   4.16667E-02   0.00000E+00   0.00000E+00   0.00000E+00
  0 bb     0.00000E+00   0.00000E+00   0.00000E+00   4.16667E-02   0.00000E+00   0.00000E+00
  0 bb     0.00000E+00   0.00000E+00   0.00000E+00   0.00000E+00   8.33333E-03   0.00000E+00
  0 bb     0.00000E+00   0.00000E+00   0.00000E+00   0.00000E+00   0.00000E+00   0.00000E+00

Matrix:   0 Aeig       6       6       6
  0 Aeig   8.33333E+01  -4.87842E+01   0.00000E+00   0.00000E+00   0.00000E+00   0.00000E+00
  0 Aeig  -4.87842E+01   8.66667E+01  -4.87842E+01   7.11752E+00  -1.66667E+00   0.00000E+00
  0 Aeig   0.00000E+00  -4.87842E+01   8.33333E+01  -4.16667E+01   7.11752E+00   0.00000E+00
  0 Aeig   0.00000E+00   7.11752E+00  -4.16667E+01   8.33333E+01  -4.87842E+01   0.00000E+00
  0 Aeig   0.00000E+00  -1.66667E+00   7.11752E+00  -4.87842E+01      Infinity     -Infinity
  0 Aeig   0.00000E+00   0.00000E+00   0.00000E+00   0.00000E+00     -Infinity      Infinity

Matrix:   0 Deig       1       6       6
  0 Deig   0.00000E+00   0.00000E+00   0.00000E+00   0.00000E+00   0.00000E+00   0.00000E+00
 Error in generalev, info=          12           6          -6

an error occured: dying ...

Could you please tell me why?

Thank you

Sijo GEORGE
________________________________
De: "nek5000-users" <nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov>>
À: "nek5000-users" <nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov>>
Envoyé: Jeudi 31 Mai 2018 14:52:40
Objet: Re: [Nek5000-users] How to give NEK5000 boundary conditions to exodus mesh file

I specify the boundary conditions in the usrdat subroutine using the following piece of code

      do i=1,nelt
        do j=1,2*ndim
          if(bc(5,j,i,1).eq.1) then
            cbc(j,i,1)='mv  '
          elseif(bc(5,j,i,1).eq.2) then
            cbc(j,i,1)='W  '
          elseif(bc(5,j,i,1).eq.3) then
            cbc(j,i,1)='W  '
          elseif(bc(5,j,i,1).eq.4) then
            cbc(j,i,1)='W  '
          else
            cbc(j,i,1)='E  '
          endif
        enddo
      enddo

Marco

On May 31, 2018, at 8:50 AM, nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov> wrote:

Hi Neks,

I did the conversion of a mesh from ICEM to exodus file then to re2 file.

But I am bit confused on the boundary conditions. Because from ICEM before I export to exodus I give the B.Cs as side set numbers and after the conversion to re2 I wont be able to put the boundary conditions in NEK format.

So could you please tell me how you put the BC in NEK5000 format to a mesh file with exodus format.

Thank you
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