fvSchemes in FOAM extend 3.1

Shenan · December 12, 2014, 12:34

I tried running the LRR turbulence model in OF 2.2.1 but ran into difficulty with time step continuity errors blowing up. I tightened the pressure convergence criteria but still it blew up; so I thought I'd give FOAM 3.1 a try.

I thought most things would be portable but some of the fvSchemes that I was using in OF are not recognised by FOAM. For instance, in OF I had:

Code:

div(phi,U)      bounded Gauss linearUpwindV grad(U);

In FOAM,

Code:

bounded

was not recognised; so I removed it and then

Code:

grad(U)

was not recognised. The problem is that I don't know what to replace it with.

Is there a "dictionary" to "translate" between OF and FOAM?

Tushar@cfd · December 17, 2014, 00:26

Quote:

Originally Posted by Shenan

I tried running the LRR turbulence model in OF 2.2.1 but ran into difficulty with time step continuity errors blowing up. I tightened the pressure convergence criteria but still it blew up; so I thought I'd give FOAM 3.1 a try.

I thought most things would be portable but some of the fvSchemes that I was using in OF are not recognised by FOAM. For instance, in OF I had:

Code:

div(phi,U)      bounded Gauss linearUpwindV grad(U);

In FOAM,

Code:

bounded

was not recognised; so I removed it and then

Code:

grad(U)

was not recognised. The problem is that I don't know what to replace it with.

Is there a "dictionary" to "translate" between OF and FOAM?

Hello Shenan,

If I am correct then the "bounded" term was included in OpenFOAM from OF ver. 2.2 onwards. This term will be beneficial if you are running steady-state solver. It will bound your solution and help achieve better convergence.

-
Best Regards!

hjasak · December 17, 2014, 12:39

Try

Gauss linearUpwindV Gauss linear;

Shenan · December 22, 2014, 10:45

Thanks for the tip, Hrv. Unfortunately, the solver did not converge.

The time step continuity errors (sum local) went from 0.01 in the second iteration to 2e+05 in the third.

Of the other parameters, only bounding epsilon (max) showed signs of divergence: from 470 in the second iteration to 2e+08 in the third.

I will have a look at this again after Xmas. It might not be a problem with fvSchemes.

December 12, 2014, 12:34	fvSchemes in FOAM extend 3.1	#1
Shenan New Member Shenan Join Date: Nov 2014 Posts: 5 Rep Power: 12	I tried running the LRR turbulence model in OF 2.2.1 but ran into difficulty with time step continuity errors blowing up. I tightened the pressure convergence criteria but still it blew up; so I thought I'd give FOAM 3.1 a try. I thought most things would be portable but some of the fvSchemes that I was using in OF are not recognised by FOAM. For instance, in OF I had: Code: div(phi,U) bounded Gauss linearUpwindV grad(U); In FOAM, Code: bounded was not recognised; so I removed it and then Code: grad(U) was not recognised. The problem is that I don't know what to replace it with. Is there a "dictionary" to "translate" between OF and FOAM?

December 17, 2014, 12:39		#3
hjasak Senior Member Hrvoje Jasak Join Date: Mar 2009 Location: London, England Posts: 1,907 Rep Power: 33	Try Gauss linearUpwindV Gauss linear; __________________ Hrvoje Jasak Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk

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December 22, 2014, 10:45		#4
Shenan New Member Shenan Join Date: Nov 2014 Posts: 5 Rep Power: 12	Thanks for the tip, Hrv. Unfortunately, the solver did not converge. The time step continuity errors (sum local) went from 0.01 in the second iteration to 2e+05 in the third. Of the other parameters, only bounding epsilon (max) showed signs of divergence: from 470 in the second iteration to 2e+08 in the third. I will have a look at this again after Xmas. It might not be a problem with fvSchemes.