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Unofficial theory guide for relativeVelocityModel in OpenFOAM8 (OpenFOAM.org)

Posted September 19, 2022 at 12:58 by nepomnyi
Updated September 23, 2022 at 12:56 by nepomnyi (I continue where I stopped yesterday.)

Tags openfoam

Here's the theory for relativeVelocityModel in OpenFOAM8 that I uncovered manually going through the code and commit history of OpenFOAM8.

Before we proceed, since there are a couple of main scientific schools in the world that use different notation, let me declare some notations that I'm going to be using:

$\cdot$ <-- this dot is just a general sign for multiplication; both multiplication of scalars and scalar multiplication of vectors can be denoted...

nepomnyi

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Installing foam-extend-4.1 from Source (Fedora 36)

Posted August 30, 2022 at 06:13 by elvis

Just a reminder what I did on my Fedora 36
http://https://openfoamwiki.net/inde...oam-extend-4.1

Code:

 dnf install -y  python3-pip m4 flex bison git git-core mercurial cmake cmake-gui openmpi openmpi-devel metis metis-devel metis64 metis64-devel
llvm llvm-devel zlib  zlib-devel  ....

Code:

{
  echo 'export PATH=/usr/local/cuda/bin:$PATH' 
  echo 'module load mpi/openmpi-x86_64' 
}>> ~/.bashrc

...

elvis

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Regarding collaboration for research work in microchannel heat sink

Posted May 30, 2022 at 12:43 by p.b40

Dear Researchers,
I, Dr. Prabhakar Bhandari looking for an collaborative research in the field of microchannel heat sink. The work is totally numerical simulation based. If any body interested can email me on prabhakar.bhandari40@gmail.com

p.b40

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laplacian(rAU, p) == fvc::div(phiHbyA)?

Posted May 28, 2022 at 17:13 by Mars409

Quote:

Originally Posted by sharonyue

Hi,

In icoFoam's code, we have:

Code:

fvScalarMatrix pEqn
                (
                    fvm::laplacian(rAU, p) == fvc::div(phiHbyA)
                );

Why its not div(HbyA) as of the equation in the image?

This equation is deduced by myself. If it was wrong just correct me.

Though 9 yrs old, this question is worth leaving a note for, bc I will forget.

The argument of fvc::div(phiHbyA)...

Mars409

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2 Easy MPI pieces

Posted May 7, 2022 at 18:03 by sbaffini (NuTBox)
Updated May 9, 2022 at 17:32 by sbaffini

Anyone who has a minimum working experience with MPI (the Message Passing Interface for distributed parallel computing) has certainly had the chance to meet certain coding patterns multiple times, especially if working with a CFD (or any other computational physics like) code.

Regrettably, MPI and parallel distributed computing is one of those areas where textbooks and online examples (even SO) are largely useless, as most (if not all) of them just simply go into the details of how...