Unsteady SIMPLE solver

hani · October 19, 2005, 11:06

I'm having a problem generating a solution with the turbFoam solver, and I have been recommended to write an unsteady SIMPLE solver. Has anyone done this already?

My problem with the turbFoam solver can be that there is a big difference in Courant numbers throughout the mesh. Did anyone have any experience on this?

I have tried two different quite different 3D cases with two different grids, for which I am able to get steady solutions using simpleFoam.

Håkan.

hani · October 25, 2005, 06:23

Where can I find information on the following:
(I have searched the forum and the manual, but I can of course have missed it)

What is the difference between
tmp<fvvectormatrix> UEqn; and
fvVectorMatrix UEqn;
The former occurs in simpleFoam and the latter occurs in turbFoam. In simpleFoam the UEqn is cleared after use (UEqn.clear();). Does this have anything to do with the difference? When running without the clear statement in simpleFoam I seem to run out of memory. Why is that not the case with fvVectorMatrix UEqn; in turbFoam?

What are A() and H() in simpleFoam and turbFoam?

Håkan.

hani · October 25, 2005, 12:17

Sorry, I see that some brackets are missing in the distributed e-mail for some reason. The complete message is however available in the forum.

I guess that someone knows the answers?

Håkan.

mattijs · October 25, 2005, 14:43

tmp is just a container class to aid memory management for allocated objects.

October 19, 2005, 11:06	I'm having a problem generatin	#1
hani Senior Member Håkan Nilsson Join Date: Mar 2009 Location: Gothenburg, Sweden Posts: 205 Rep Power: 18	I'm having a problem generating a solution with the turbFoam solver, and I have been recommended to write an unsteady SIMPLE solver. Has anyone done this already? My problem with the turbFoam solver can be that there is a big difference in Courant numbers throughout the mesh. Did anyone have any experience on this? I have tried two different quite different 3D cases with two different grids, for which I am able to get steady solutions using simpleFoam. Håkan.

October 25, 2005, 06:23	Where can I find information o	#2
hani Senior Member Håkan Nilsson Join Date: Mar 2009 Location: Gothenburg, Sweden Posts: 205 Rep Power: 18	Where can I find information on the following: (I have searched the forum and the manual, but I can of course have missed it) What is the difference between tmp<fvvectormatrix> UEqn; and fvVectorMatrix UEqn; The former occurs in simpleFoam and the latter occurs in turbFoam. In simpleFoam the UEqn is cleared after use (UEqn.clear();). Does this have anything to do with the difference? When running without the clear statement in simpleFoam I seem to run out of memory. Why is that not the case with fvVectorMatrix UEqn; in turbFoam? What are A() and H() in simpleFoam and turbFoam? Håkan.

October 25, 2005, 12:17	Sorry, I see that some bracket	#3
hani Senior Member Håkan Nilsson Join Date: Mar 2009 Location: Gothenburg, Sweden Posts: 205 Rep Power: 18	Sorry, I see that some brackets are missing in the distributed e-mail for some reason. The complete message is however available in the forum. I guess that someone knows the answers? Håkan.

October 25, 2005, 14:43	tmp is just a container class	#4
mattijs Senior Member Mattijs Janssens Join Date: Mar 2009 Posts: 1,419 Rep Power: 26	tmp is just a container class to aid memory management for allocated objects.

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