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Search: Posts Made By: dlahaye
Forum: OpenFOAM Running, Solving & CFD November 22, 2022, 07:36
Replies: 1
Views: 70
Posted By dlahaye
GAMG requires less iterations because it iterates...

GAMG requires less iterations because it iterates on various levels of accuracy. See literature on Multigrid Methods, e.g., book of Moukalled-Darwish-Mangani or...
Forum: OpenFOAM Programming & Development November 5, 2022, 06:40
Replies: 84
Views: 21,587
Posted By dlahaye
I will talk to Prof. Dirk Roekaerts, see what I...

I will talk to Prof. Dirk Roekaerts, see what I can arrange and get back to here.

Cheers, Domenico.
Forum: OpenFOAM Programming & Development November 4, 2022, 03:41
Replies: 8
Views: 138
Posted By dlahaye
I am surprise flow of water to be compressible....

I am surprise flow of water to be compressible. What is the Mach number of the flow?
Forum: OpenFOAM Programming & Development November 4, 2022, 03:39
Replies: 84
Views: 21,587
Posted By dlahaye
More recent work is here...

More recent work is here https://repository.tudelft.nl/islandora/object/uuid%3A0e4db0e6-1852-4346-ad25-11f3eed9d0bd?collection=education

Give it a look. In case of interest, I can look for the...
Forum: OpenFOAM Programming & Development November 3, 2022, 12:53
Replies: 5
Views: 159
Posted By dlahaye
Dear Mostafa, 1/ My bad. Thank you for...

Dear Mostafa,

1/ My bad. Thank you for pointing our my mistake. Appreciated. I will redo my homework.

2/ Returning to your original question.



Is it possibly that phiN is taken into...
Forum: OpenFOAM Programming & Development November 3, 2022, 08:38
Replies: 8
Views: 138
Posted By dlahaye
rhoCentralFoam for water flow? Really? What are...

rhoCentralFoam for water flow? Really? What are you trying to simulate?
Forum: OpenFOAM Programming & Development November 3, 2022, 07:41
Replies: 8
Views: 138
Posted By dlahaye
What is yr constant/thermophysicalProperties? ...

What is yr constant/thermophysicalProperties?

What are Tobi's polynomials? Can you use standard Janna instead?

Domenico.
Forum: OpenFOAM Programming & Development November 3, 2022, 06:59
Replies: 5
Views: 159
Posted By dlahaye
I am confused by your explanation for the...

I am confused by your explanation for the following two reasons.

1/ valueInternalCoeffs() and valueBoundaryCoeffs() are related to Dirichlet bc (fixed values). gradientInternalCoeffs() and...
Forum: OpenFOAM Programming & Development November 2, 2022, 13:59
Replies: 8
Views: 138
Posted By dlahaye
The error indicates that rhoCentralFoam only...

The error indicates that rhoCentralFoam only supports hePsiThermo.

Change thermodynamics to hePsiThermo (more versatile at possibly higher computational cost)

Or change solver to rhoPimpleFoam...
Forum: OpenFOAM Programming & Development November 2, 2022, 05:10
Replies: 5
Views: 159
Posted By dlahaye
Could you pls. elaborate on your post and place...

Could you pls. elaborate on your post and place links to the code that you are referring to? Thx.
Forum: OpenFOAM Programming & Development November 2, 2022, 05:06
Replies: 10
Views: 203
Posted By dlahaye
Apologies for the delay in the reply. ...

Apologies for the delay in the reply.

Please note that line 333 in fvMatrix.C...
Forum: OpenFOAM Programming & Development November 2, 2022, 04:53
Replies: 19
Views: 585
Posted By dlahaye
Apologies for the delay in the reply. ...

Apologies for the delay in the reply.

Focussing on the p-solve makes obvious sense. I am not sure how much sparse linear algebra can be accelerated on GPU.

I tend to focus on algorithmic...
Forum: OpenFOAM Programming & Development October 24, 2022, 12:25
Replies: 10
Views: 203
Posted By dlahaye
I still do not understand your problem as much as...

I still do not understand your problem as much as I would like to.

In your inner loop, you want to solve differential equation plus boundary conditions.

The lines of codes you refer to merely...
Forum: OpenFOAM Pre-Processing October 24, 2022, 08:11
Replies: 3
Views: 123
Posted By dlahaye
what if you create a constant/chemistryProperties...

what if you create a constant/chemistryProperties file?
Forum: OpenFOAM Programming & Development October 24, 2022, 08:04
Replies: 10
Views: 203
Posted By dlahaye
I tend to disagree. There is nothing in...

I tend to disagree.

There is nothing in fvm::laplacian() that takes boundary conditions into account. See source code or book of Moukalled-Darwish-Mangani.

Boundary conditions are taken into...
Forum: OpenFOAM Programming & Development October 24, 2022, 06:04
Replies: 10
Views: 203
Posted By dlahaye
You lost me in translation, I am afraid to say. ...

You lost me in translation, I am afraid to say.

The same partial differential equation for a field like p can have various boundary conditions. The differential equation and the boundary...
Forum: OpenFOAM Programming & Development October 24, 2022, 05:04
Replies: 10
Views: 203
Posted By dlahaye
Could you please explain further? You say...

Could you please explain further?

You say that "When initializing a fvMatrix the bc are automatically updated." Is this your code or default OpenFoam code? What do you mean by "initializing a...
Forum: OpenFOAM Pre-Processing October 23, 2022, 15:06
Replies: 3
Views: 123
Posted By dlahaye
The Sandia-D tutorial switches combustion off in...

The Sandia-D tutorial switches combustion off in initial stage of computations. Have a look at the Allrun script.
Forum: OpenFOAM Programming & Development October 23, 2022, 15:02
Replies: 19
Views: 585
Posted By dlahaye
I agree that in OpenFOAM the linear algebra...

I agree that in OpenFOAM the linear algebra zero-halo approach (i.e. the hierarchy of lduMatrix and fvMatrix) and the mesh interfaces (i.e. the hierarchy of primitiveMesh, lduMesh and fvMesh) are...
Forum: OpenFOAM Programming & Development October 20, 2022, 12:36
Replies: 19
Views: 585
Posted By dlahaye
I agree that OpenFOAM assign groups of cells to...

I agree that OpenFOAM assign groups of cells to processors.

I, however, fail to understand your interpretation of the LDU matrix format in case that the matrix is decomposed according to groups...
Forum: OpenFOAM Programming & Development October 20, 2022, 08:22
Replies: 19
Views: 585
Posted By dlahaye
Aha. For proc0: The interface between...

Aha.

For proc0:
The interface between proc0 and proc1 is stored in LDU format with L and D left empty. Only U remains. Idem for interface between proc0 and proc2.

proc0 thus stores:
its...
Forum: OpenFOAM Programming & Development October 19, 2022, 11:20
Replies: 19
Views: 585
Posted By dlahaye
Not sure. How about making the mesh in...

Not sure.

How about making the mesh in essence 1D in x-direction (i.e., 1 cell in both y and z direction) and specifying the decomposition to be manual as (3 1 1)?

With more details on what...
Forum: OpenFOAM Programming & Development October 17, 2022, 10:27
Replies: 9
Views: 671
Posted By dlahaye
Dear Klaus, Thank you for getting in...

Dear Klaus,

Thank you for getting in touch.

I am aware of PETSc4FOAM. I am trying to increase my understanding of why the speedup that PETSc4FOAM remains limited or how to use more...
Forum: OpenFOAM Programming & Development October 17, 2022, 05:47
Replies: 9
Views: 671
Posted By dlahaye
Dear Klaus, 1/ Valuable information on the...

Dear Klaus,

1/ Valuable information on the implementation of boundary conditions in OpenFoam is in Section 18.2 of the Moukalled-Mangani-Darwish book;

2/ I do see some information on...
Forum: OpenFOAM Programming & Development October 14, 2022, 14:27
Replies: 9
Views: 671
Posted By dlahaye
I agree. A tutorial case (e.g. extending...

I agree.

A tutorial case (e.g. extending https://github.com/UnnamedMoose/BasicOpenFOAMProgrammingTutorials) with linear algebra aspects would be valuable.

I suggest to start from...
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