Use coarse grid flow solution as initial solution for fine grid

nathanricks · March 22, 2019, 05:10

Hi SU2 Users,

I think the title is pretty self-explanatory, but I will expand for clarity.

I'm just wondering if it is possible to use a flow solution from a coarse grid, as the initial solution for running a finer resolution grid of the same geometry? So if there is some sort of built-in interpolation between two meshes?

I'm running a case where if the solution does not converge, I refine the mesh, and run again on the refined mesh - so it would be great if I could use the flow solution obtained from the coarse mesh (as long as it didn't diverged, just didn't converge in a set number of iterations) as a starting point for the fine grid.

If you know if this sort of thing is available, please let me know!

Thank you in advance,
Kind Regards,

Nathan

pcg · March 31, 2019, 18:59

Hi Nathan,

Currently that functionality is not implemented, but someone is working on it for v7.

Cheers,
Pedro

nathanricks · April 2, 2019, 10:25

Quote:

Originally Posted by pcg

Hi Nathan,

Currently that functionality is not implemented, but someone is working on it for v7.

Cheers,
Pedro

Hi Pedro,

Thanks for the reply, that's great to hear it's coming!

Cheers,
Nathan

giovanni.medici · January 20, 2023, 13:34

I know it is a relatively old post, anyway I was wondering whether the function
of interpolating a solution of a coarse mesh onto a refined one, is actually available in the latest SU2 versions (7.5.0).

I know that a lot of effort was carried out in the last years and releases, and that until say version 7.0.3 a feature_adap branch was carrying that option (it was actually providing a lot more, with mesh adaptation based on solution parameters).

To my understanding that branch didn't make it to merge to the master one, and is not updated.

Thanks!

pcg · January 20, 2023, 19:15

It is currently possible to restart from a solution on a coarser (or finer) mesh.
No options are required.

giovanni.medici · January 21, 2023, 04:41

Oh, that's great, thanks for the answer Pedro!

hyunko · January 25, 2023, 08:00

Quote:

Originally Posted by pcg

It is currently possible to restart from a solution on a coarser (or finer) mesh.
No options are required.

Wow. That’s very good.

March 22, 2019, 05:10	Use coarse grid flow solution as initial solution for fine grid	#1
nathanricks New Member Nathan Ricks Join Date: Aug 2015 Posts: 10 Rep Power: 11	Hi SU2 Users, I think the title is pretty self-explanatory, but I will expand for clarity. I'm just wondering if it is possible to use a flow solution from a coarse grid, as the initial solution for running a finer resolution grid of the same geometry? So if there is some sort of built-in interpolation between two meshes? I'm running a case where if the solution does not converge, I refine the mesh, and run again on the refined mesh - so it would be great if I could use the flow solution obtained from the coarse mesh (as long as it didn't diverged, just didn't converge in a set number of iterations) as a starting point for the fine grid. If you know if this sort of thing is available, please let me know! Thank you in advance, Kind Regards, Nathan

January 20, 2023, 19:15		#5
pcg Senior Member Pedro Gomes Join Date: Dec 2017 Posts: 466 Rep Power: 14	It is currently possible to restart from a solution on a coarser (or finer) mesh. No options are required. hyunko likes this.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Suppress twoPhaseEulerFoam energy	AlmostSurelyRob	OpenFOAM Running, Solving & CFD	33	September 25, 2018 18:45
HeatSource BC to the whole region in chtMultiRegionHeater	xsa	OpenFOAM Running, Solving & CFD	3	November 7, 2016 06:07
Cannot run the code properly: very large time step continuity error	crst15	OpenFOAM Running, Solving & CFD	9	December 14, 2014 19:17
SLTS+rhoPisoFoam: what is rDeltaT???	nileshjrane	OpenFOAM Running, Solving & CFD	4	February 25, 2013 05:13
Error while running rhoPisoFoam..	nileshjrane	OpenFOAM Running, Solving & CFD	8	August 26, 2010 13:50

March 31, 2019, 18:59		#2
pcg Senior Member Pedro Gomes Join Date: Dec 2017 Posts: 466 Rep Power: 14	Hi Nathan, Currently that functionality is not implemented, but someone is working on it for v7. Cheers, Pedro

January 20, 2023, 13:34		#4
giovanni.medici Member Giovanni Medici Join Date: Mar 2014 Posts: 48 Rep Power: 12	I know it is a relatively old post, anyway I was wondering whether the function of interpolating a solution of a coarse mesh onto a refined one, is actually available in the latest SU2 versions (7.5.0). I know that a lot of effort was carried out in the last years and releases, and that until say version 7.0.3 a feature_adap branch was carrying that option (it was actually providing a lot more, with mesh adaptation based on solution parameters). To my understanding that branch didn't make it to merge to the master one, and is not updated. Thanks!

January 21, 2023, 04:41		#6
giovanni.medici Member Giovanni Medici Join Date: Mar 2014 Posts: 48 Rep Power: 12	Oh, that's great, thanks for the answer Pedro!