volumetric heat source w/ inflow
Hello all, I am working on a problem consisting of an axially-horizontal cylindrical tank with an inlet (an opening) at its top and a connected pipe to its bottom as an outlet. The boundary conditions are set accordingly, i.e., inflow and outflow, respectively. There is no problem with isothermal simulation of such configuration. However, when volumetric heat source is added to the fluid domain (via userq2 subroutine), non-physical temperatures have been observed at the walls (w/ adiabatic BC) in the immediate vicinity of the inflow (w/ Dirichlet temperature BC). In fact, the element nodes close to the inlet have very high or very low temperatures, which are no expected. I am wondering if anyone has any experience/hint on this issue. Thanks, Mohsen
Hi Mohsen, userq2 is used only with MOAB -- use qvol in userq instead -- see, e.g. examples/conj_ht/conj_ht.usr but without condition on nelgv Best. Aleks ________________________________________ From: [email protected] [[email protected]] on behalf of [email protected] [[email protected]] Sent: Tuesday, June 10, 2014 10:16 AM To: Nek 5000 Subject: [Nek5000-users] volumetric heat source w/ inflow Hello all, I am working on a problem consisting of an axially-horizontal cylindrical tank with an inlet (an opening) at its top and a connected pipe to its bottom as an outlet. The boundary conditions are set accordingly, i.e., inflow and outflow, respectively. There is no problem with isothermal simulation of such configuration. However, when volumetric heat source is added to the fluid domain (via userq2 subroutine), non-physical temperatures have been observed at the walls (w/ adiabatic BC) in the immediate vicinity of the inflow (w/ Dirichlet temperature BC). In fact, the element nodes close to the inlet have very high or very low temperatures, which are no expected. I am wondering if anyone has any experience/hint on this issue. Thanks, Mohsen _______________________________________________ Nek5000-users mailing list [email protected] https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
Hi Aleks, I should have mentioned in my previous email that I am actually using MOAB. Thanks, Mohsen On 10-Jun-14, at 12:01 PM, <[email protected]> wrote:
Hi Mohsen,
userq2 is used only with MOAB -- use qvol in userq instead -- see, e.g. examples/conj_ht/conj_ht.usr but without condition on nelgv
Best. Aleks
________________________________________ From: [email protected] [nek5000-users- [email protected]] on behalf of nek5000- [email protected] [[email protected]] Sent: Tuesday, June 10, 2014 10:16 AM To: Nek 5000 Subject: [Nek5000-users] volumetric heat source w/ inflow
Hello all, I am working on a problem consisting of an axially-horizontal cylindrical tank with an inlet (an opening) at its top and a connected pipe to its bottom as an outlet. The boundary conditions are set accordingly, i.e., inflow and outflow, respectively. There is no problem with isothermal simulation of such configuration. However, when volumetric heat source is added to the fluid domain (via userq2 subroutine), non-physical temperatures have been observed at the walls (w/ adiabatic BC) in the immediate vicinity of the inflow (w/ Dirichlet temperature BC). In fact, the element nodes close to the inlet have very high or very low temperatures, which are no expected.
I am wondering if anyone has any experience/hint on this issue.
Thanks, Mohsen
_______________________________________________ Nek5000-users mailing list [email protected] https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users _______________________________________________ Nek5000-users mailing list [email protected] https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
Hi Mohsen, One way I usually check my MOAB setups is by running the Nek's version of it. For this one needs to get Mesh & BC by calling gen_rea(2) from say userchk, add the missing parameters to create .rea file, run genmap for .map file and fill q array in userq2() routine by calling the latter from userq() say once per timestep Aleks ________________________________________ From: [email protected] [[email protected]] on behalf of [email protected] [[email protected]] Sent: Tuesday, June 10, 2014 11:03 AM To: [email protected] Subject: Re: [Nek5000-users] volumetric heat source w/ inflow Hi Aleks, I should have mentioned in my previous email that I am actually using MOAB. Thanks, Mohsen On 10-Jun-14, at 12:01 PM, <[email protected]> wrote:
Hi Mohsen,
userq2 is used only with MOAB -- use qvol in userq instead -- see, e.g. examples/conj_ht/conj_ht.usr but without condition on nelgv
Best. Aleks
________________________________________ From: [email protected] [nek5000-users- [email protected]] on behalf of nek5000- [email protected] [[email protected]] Sent: Tuesday, June 10, 2014 10:16 AM To: Nek 5000 Subject: [Nek5000-users] volumetric heat source w/ inflow
Hello all, I am working on a problem consisting of an axially-horizontal cylindrical tank with an inlet (an opening) at its top and a connected pipe to its bottom as an outlet. The boundary conditions are set accordingly, i.e., inflow and outflow, respectively. There is no problem with isothermal simulation of such configuration. However, when volumetric heat source is added to the fluid domain (via userq2 subroutine), non-physical temperatures have been observed at the walls (w/ adiabatic BC) in the immediate vicinity of the inflow (w/ Dirichlet temperature BC). In fact, the element nodes close to the inlet have very high or very low temperatures, which are no expected.
I am wondering if anyone has any experience/hint on this issue.
Thanks, Mohsen
_______________________________________________ Nek5000-users mailing list [email protected] https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users _______________________________________________ Nek5000-users mailing list [email protected] https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
_______________________________________________ Nek5000-users mailing list [email protected] https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
Thanks Aleks for your suggestion. So you think it might be because of some issue with MOAB. I'll check this out, though, apparently, I haven't had any problem reading the mesh and sidesets into Nek via MOAB. Mohsen On 10-Jun-14, at 12:27 PM, <[email protected]> wrote:
Hi Mohsen,
One way I usually check my MOAB setups is by running the Nek's version of it.
For this one needs to get Mesh & BC by calling gen_rea(2) from say userchk, add the missing parameters to create .rea file, run genmap for .map file and fill q array in userq2() routine by calling the latter from userq() say once per timestep
Aleks
________________________________________ From: [email protected] [nek5000-users- [email protected]] on behalf of nek5000- [email protected] [[email protected]] Sent: Tuesday, June 10, 2014 11:03 AM To: [email protected] Subject: Re: [Nek5000-users] volumetric heat source w/ inflow
Hi Aleks, I should have mentioned in my previous email that I am actually using MOAB.
Thanks, Mohsen
On 10-Jun-14, at 12:01 PM, <[email protected]> wrote:
Hi Mohsen,
userq2 is used only with MOAB -- use qvol in userq instead -- see, e.g. examples/conj_ht/conj_ht.usr but without condition on nelgv
Best. Aleks
________________________________________ From: [email protected] [nek5000-users- [email protected]] on behalf of nek5000- [email protected] [[email protected]] Sent: Tuesday, June 10, 2014 10:16 AM To: Nek 5000 Subject: [Nek5000-users] volumetric heat source w/ inflow
Hello all, I am working on a problem consisting of an axially-horizontal cylindrical tank with an inlet (an opening) at its top and a connected pipe to its bottom as an outlet. The boundary conditions are set accordingly, i.e., inflow and outflow, respectively. There is no problem with isothermal simulation of such configuration. However, when volumetric heat source is added to the fluid domain (via userq2 subroutine), non-physical temperatures have been observed at the walls (w/ adiabatic BC) in the immediate vicinity of the inflow (w/ Dirichlet temperature BC). In fact, the element nodes close to the inlet have very high or very low temperatures, which are no expected.
I am wondering if anyone has any experience/hint on this issue.
Thanks, Mohsen
_______________________________________________ Nek5000-users mailing list [email protected] https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users _______________________________________________ Nek5000-users mailing list [email protected] https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
_______________________________________________ Nek5000-users mailing list [email protected] https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users _______________________________________________ Nek5000-users mailing list [email protected] https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
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