[Nek5000-users] New code+recycling BC
nek5000-users at lists.mcs.anl.gov
nek5000-users at lists.mcs.anl.gov
Fri May 14 22:36:19 CDT 2010
Hi,
Thanks for the help, I guess I based my approach on a much older version
since pointer numbering was done much differently.
Anyhow, I got it to work now, if someone wants to build a recycling
inflow boundary condition based on the jet example here are some
hopefully useful hints (that were not obvious to me):
in the jet example, the inflow pipe is build on the x/y plane (where on
each x/y plane there are 84 elements, which is ne_per_slab), and there
are 8 layers in z (n_slab). The rest of the domain (surroundings where
jet flows into) has all element numbers higher than 8*84.
For these reasons, it works to define a pointer to the recycling face
for each inlet face element (which you know are elements 1-84 globally)
as "ieshift=eg+(nslab-1)*ne_per_slab".
Markus
nek5000-users at lists.mcs.anl.gov wrote:
> Hi Markus,
>
> yes we changed glo_num to be an 8-byte integer array. Unfortunately we did not update the examples. I'll update the turbJet example.
>
> Stefan
>
>
> On May 5, 2010, at 12:39 AM, nek5000-users at lists.mcs.anl.gov wrote:
>
>> Hiu,
>>
>> sorry about the delay, to make sure I regenerated the problem.
>>
>> I did as you suggested, it is still messed up when opening the first fld dump in
>> VisIt with the meta file containing only one file.
>>
>> What I meant by element ordering is the way the recycling b.c. is set up, where
>> the "outflow" face of recycling box is established by counting a number of
>> elements downstream from the inflow, as it is done in the jet example. I have a
>> suspicion that something changed there (not in my .rea file, though).
>> The problem came about when updating Nek from 404 to 503, I did not change
>> Visit.
>>
>> Thanks,
>> Markus
>>
>>
>>
>> Quoting nek5000-users at lists.mcs.anl.gov:
>>
>>> Can you dump a field file including the geometry and then visualize it using
>>> VisIt (your metadata file should only contain one single fld). Is it still
>>> messed up?
>>>
>>> Stefan
>>>
>>>
>>> On May 3, 2010, at 5:24 PM, nek5000-users at lists.mcs.anl.gov wrote:
>>>
>>>> Markus,
>>>>
>>>> is it only a viz issue or do you have some problems in Nek after upgrading
>>> to the latest release.
>>>> Stefan
>>>>
>>>>
>>>> On May 3, 2010, at 4:25 PM, nek5000-users at lists.mcs.anl.gov wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> when updating the code from rev. 404 (oldvel.png) to 503
>>>>> (newvel.png), I realized a problem with the recycling
>>>>> (periodic) boundary condition for a channel simulation I am doing -
>>>>> compare the attached pictures of velocity on the inflow plane (the inflow
>>> is the Y/Z plane). For the two cases, SIZE/SIZEu, .rea, the restart step and
>>> .usr are the exact same.
>>>>> Here are the relevant pieces from .usr. Have any of the functions
>>>>> changed or am I doing something wrong? It seems as if the element
>>>>> ordering is not what it was before.
>>>>> I did this based on the jet example.
>>>>>
>>>>> Thanks,
>>>>> Markus
>>>>>
>>>>>
>>>>> c-----------------------------------------------------------------------
>>>>> subroutine userbc (ix,iy,iz,iside,eg)
>>>>> include 'SIZE'
>>>>> include 'TOTAL'
>>>>> include 'NEKUSE'
>>>>>
>>>>> common /cvelbc/ uin(lx1,ly1,lz1,lelv)
>>>>> $ , vin(lx1,ly1,lz1,lelv)
>>>>> $ , win(lx1,ly1,lz1,lelv)
>>>>> $ , tin(lx1,ly1,lz1,lelv)
>>>>>
>>>>> integer e,eg
>>>>>
>>>>> e = gllel(eg)
>>>>>
>>>>> ux=uin(ix,iy,iz,e)
>>>>> uy=vin(ix,iy,iz,e)
>>>>> uz=win(ix,iy,iz,e)
>>>>> .
>>>>> ....
>>>>>
>>>>> c-----------------------------------------------------------------------
>>>>> subroutine userchk
>>>>> include 'SIZE'
>>>>> include 'TOTAL'
>>>>> include 'ZPER' ! for nelx,nely,nelz
>>>>> include 'RESTART' !Needs to be here for prepost to work
>>>>> common /cvlmsk/ vlmsk(lx1,ly1,lz1,lelt),vvol,
>>>>> & wt(lx1*ly1*lz1,lelt),vol_per
>>>>>
>>>>> integer e,f,eg,ninx,niny,ninz
>>>>>
>>>>> .c-----Computations for recycling BC
>>>>> speed = glsc2(vx,wt,n)/vol_per ! Where vol_per is the volume of
>>>>> the recycling box
>>>>> starg = 1.0
>>>>> addtemp = 1.0
>>>>> call set_inflow(starg,speed,addtemp) ! set up inflow BCs
>>>>> .
>>>>> ....
>>>>>
>>>>> c-----------------------------------------------------------------------
>>>>> subroutine set_inflow(starg,speed,addtemp) ! set up inflow BCs
>>>>>
>>>>> include 'SIZE'
>>>>> include 'TOTAL'
>>>>>
>>>>> integer icalld,e,eg,f
>>>>> save icalld
>>>>> data icalld /0/
>>>>>
>>>>> common /cvelbc/ uin(lx1,ly1,lz1,lelv)
>>>>> $ , vin(lx1,ly1,lz1,lelv)
>>>>> $ , win(lx1,ly1,lz1,lelv)
>>>>> $ , tin(lx1,ly1,lz1,lelv)
>>>>>
>>>>> common /scruz/ ptr(lx1,ly1,lz1,lelv)
>>>>> integer ptr,gs_bc_hndl
>>>>> save gs_bc_hndl
>>>>>
>>>>> real ratio
>>>>> save ratio
>>>>> data ratio / 1. /
>>>>>
>>>>> common /nekmpi/ mid,mp,nekcomm,nekgroup,nekreal
>>>>>
>>>>> n = nx1*ny1*nz1*nelv
>>>>>
>>>>> if (icalld.eq.0) then
>>>>> icalld = 1
>>>>> nxyz = nx1*ny1*nz1
>>>>>
>>>>> do e=1,nelv
>>>>> eg = lglel(e)
>>>>> eo = nxyz*(eg-1) ! offset
>>>>> do i=1,nxyz
>>>>> ptr(i,1,1,e) = i+eo
>>>>> enddo
>>>>>
>>>>> do k=2,nz1-1 ! get rid of interior pointers
>>>>> do j=2,ny1-1 do i=2,nx1-1
>>>>> ptr(i,j,k,e) = 0
>>>>> enddo
>>>>> enddo
>>>>> enddo
>>>>>
>>>>> nface = 2*ndim
>>>>> do f=1,nface ! connect inflow to elems downstream
>>>>> ioff = nxyz*8 ! 5 elements in X to end of "periodic" sec.
>>>>> if (cbc(f,e,1).eq.'v ') then
>>>>> call iface_add(ptr,f,e,ioff,nx1,ny1,nz1)
>>>>> endif
>>>>> enddo
>>>>>
>>>>> enddo
>>>>>
>>>>> call gs_setup(gs_bc_hndl,ptr,n,nekcomm,np) ! connect v +
>>>>> downstream
>>>>>
>>>>> endif
>>>>>
>>>>> call copy(uin,vx,n)
>>>>> call copy(vin,vy,n)
>>>>> call copy(win,vz,n)
>>>>> call copy(tin,t,n)
>>>>>
>>>>> call col2(uin,v1mask,n)
>>>>> call col2(vin,v2mask,n)
>>>>> call col2(win,v3mask,n)
>>>>> call col2(tin,tmask,n)
>>>>>
>>>>> call gs_op(gs_bc_hndl,uin,1,1,0) ! 1 ==> + ! uin(inflow) =
>>>>> vx(slab_k)
>>>>> call gs_op(gs_bc_hndl,vin,1,1,0) ! 1 ==> +
>>>>> call gs_op(gs_bc_hndl,win,1,1,0) ! 1 ==> +
>>>>> call gs_op(gs_bc_hndl,tin,1,1,0) ! 1 ==> +
>>>>>
>>>>> if (speed.gt.0) then
>>>>> ratio = .5*(starg/speed + ratio)
>>>>> call cmult(uin,ratio,n)
>>>>> call cmult(vin,ratio,n)
>>>>> call cmult(win,ratio,n)
>>>>> call cadd(tin,addtemp,n) !Substract added heat
>>>>> endif
>>>>>
>>>>> return
>>>>> end
>>>>>
>>>>>
>>>>>
>>>>> <oldvel.png><newvel.png>_______________________________________________
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>>>>> Nek5000-users at lists.mcs.anl.gov
>>>>> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
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