Is there a software that couples p and U?

samiam1000 · October 4, 2012, 11:58

Hi all,

I am facing an interesting problem and I can't get convergence.

I think that the problem is in the numerical resolution. I would need a scheme that couples p and U.

Is there such a scheme in OF?

Thanks a lot,
Samuele

ata · October 6, 2012, 07:52

Hi
Do you really mean scheme? or coupling algorithm?

samiam1000 · October 8, 2012, 05:22

Let's say coupling algorithm!

ata · October 8, 2012, 06:25

Hi
I am confused what really you want but there is SIMPLE, PISO and ... algorithms in OF.

samiam1000 · October 8, 2012, 06:27

Yes,

I know.

But AFAIK, both simple and piso solved the P field first and then the U field, is that correct. I know that in fluent there is a solver which solved the U and P field together at each iteration.

ata · October 8, 2012, 06:30

Hi
Now I understand you. Is your problem compressible or weakly compressible?

samiam1000 · October 8, 2012, 06:32

Ok.
Sorry, I didn't explain the problem well.

Anyway, my problem is compressible

ata · October 8, 2012, 06:38

Oh!
As I know unfortunately there is not such solver in OF.

samiam1000 · October 8, 2012, 07:12

And do you have any suggestion for a weak-compressible problem?

ata · October 9, 2012, 07:48

Hi
Not specific offer just using a compressible equation of state and setting Match number low to be weakly compressible.

akidess · October 9, 2012, 08:21

OpenFOAM extend offers a block-coupled solution strategy. Unfortunately, that's all I know about it

Google block-coupled-matrix...

samiam1000 · October 9, 2012, 11:32

Thanks.
I'll google it as soon as possible.

Samuele

October 4, 2012, 11:58	Is there a software that couples p and U?	#1
samiam1000 Senior Member Samuele Z Join Date: Oct 2009 Location: Mozzate - Co - Italy Posts: 520 Rep Power: 19	Hi all, I am facing an interesting problem and I can't get convergence. I think that the problem is in the numerical resolution. I would need a scheme that couples p and U. Is there such a scheme in OF? Thanks a lot, Samuele

October 9, 2012, 08:21		#11
akidess Senior Member Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,377 Rep Power: 30	OpenFOAM extend offers a block-coupled solution strategy. Unfortunately, that's all I know about it Google block-coupled-matrix... __________________ On twitter @akidTwit Spend as much time formulating your questions as you expect people to spend on their answer.

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October 6, 2012, 07:52		#2
ata Senior Member ata kamyabi Join Date: Aug 2009 Location: Kerman Posts: 323 Rep Power: 18	Hi Do you really mean scheme? or coupling algorithm?

October 8, 2012, 05:22		#3
samiam1000 Senior Member Samuele Z Join Date: Oct 2009 Location: Mozzate - Co - Italy Posts: 520 Rep Power: 19	Let's say coupling algorithm!

October 8, 2012, 06:25		#4
ata Senior Member ata kamyabi Join Date: Aug 2009 Location: Kerman Posts: 323 Rep Power: 18	Hi I am confused what really you want but there is SIMPLE, PISO and ... algorithms in OF.

October 8, 2012, 06:27		#5
samiam1000 Senior Member Samuele Z Join Date: Oct 2009 Location: Mozzate - Co - Italy Posts: 520 Rep Power: 19	Yes, I know. But AFAIK, both simple and piso solved the P field first and then the U field, is that correct. I know that in fluent there is a solver which solved the U and P field together at each iteration.

October 8, 2012, 06:30		#6
ata Senior Member ata kamyabi Join Date: Aug 2009 Location: Kerman Posts: 323 Rep Power: 18	Hi Now I understand you. Is your problem compressible or weakly compressible?

October 8, 2012, 06:32		#7
samiam1000 Senior Member Samuele Z Join Date: Oct 2009 Location: Mozzate - Co - Italy Posts: 520 Rep Power: 19	Ok. Sorry, I didn't explain the problem well. Anyway, my problem is compressible

October 8, 2012, 06:38		#8
ata Senior Member ata kamyabi Join Date: Aug 2009 Location: Kerman Posts: 323 Rep Power: 18	Oh! As I know unfortunately there is not such solver in OF.

October 8, 2012, 07:12		#9
samiam1000 Senior Member Samuele Z Join Date: Oct 2009 Location: Mozzate - Co - Italy Posts: 520 Rep Power: 19	And do you have any suggestion for a weak-compressible problem?

October 9, 2012, 07:48		#10
ata Senior Member ata kamyabi Join Date: Aug 2009 Location: Kerman Posts: 323 Rep Power: 18	Hi Not specific offer just using a compressible equation of state and setting Match number low to be weakly compressible.

October 9, 2012, 11:32		#12
samiam1000 Senior Member Samuele Z Join Date: Oct 2009 Location: Mozzate - Co - Italy Posts: 520 Rep Power: 19	Thanks. I'll google it as soon as possible. Samuele