CFD Online Discussion Forums

Constant Temperature Volumetric region

Posted May 6, 2012 at 15:33 by peterliu

how the energy equation implemented in FLUENT

Quote:

Originally Posted by evcelica

Yes Glenn, that's exactly what I was saying, for example:

E.genSource = (T.desired - Temperature)*c.p*density*(1/time constant)

It still not instantly switching to the new temperature, as you still have some sort of a time constant but you can make it very very small.
What you choose as a time constant will be where it starts approaching your temperature, so you could choose 1sec or 10^-whatever

...

peterliu

New Member

Posted in Uncategorized

Views 35 Comments 0 peterliu is offline

Testing Engrid installer on various Distributions

Posted May 6, 2012 at 09:29 by elvis

I tested the Engrid installer

mkdir ~/Software
cd ~/Software
wget http://sourceforge.net/projects/engr...1.3/build.bash
source build.bash ubuntu-11.10

worked fine on ubuntu except for 12.04 „Precise Pangolin“
also no problems on aptosid except for aptosid 2011-03 "Πόνος"

elvis

Senior Member

Posted in Uncategorized

Views 31 Comments 0 elvis is offline

Pstream library error in parallel mode

Posted May 1, 2012 at 09:54 by lth

when running parallel on SGI clusters -lth

QUOTE=begou;244641]Problem solved.

Allwmake had not compiled the parallel part of Pstream. I had added a new MPI config for MPT wich is the MPI version provided by SGI on my Altix server. I've called this new config MPT, of course

.
But the script used to build Pstream tests for the existence of the 3 letters "MPI" in the name of the MPI config

($WM_MPLIB variable)

the solution is
...

lth

New Member

Posted in Uncategorized

Views 38 Comments 0 lth is offline

Parallel Computing decomposePar

Posted April 23, 2012 at 14:15 by lth

In case I run into this issue again!

Quote:

Originally Posted by ChrisPro

First: Happy New Year!!

oh thanks a lot!!! that worked fine, with your motorbike example.

but what exaclty is procBoundary? and why did you set the velocity in the changeDictionaryDict file for procBoundary?

I adapted this example to my case. It works and i get a good residual. But in my case I simulate the flow through a rather complex geometrie where all boundaries are given by stl files, even the inlet

...

lth

New Member

Posted in Uncategorized

Views 39 Comments 0 lth is offline

Set (Initial) Internal Fields Using #codeStream

Posted April 23, 2012 at 13:55 by Hisham (Notes for OpenFOAM!)

Tags codestream, field, initial, internal, openfoam

To set up (initial) internal fields of variables according to an expression, one can use the #codeStream feature as:

Code:

internalField  #codeStream
{
    code
    #{
        const IOdictionary& d = static_cast<const IOdictionary&>(dict);
        const fvMesh& mesh = refCast<const fvMesh>(d.db());
        scalarField fld(mesh.nCells(), 12.34);// uniform value of the field as 12.34 or just fld(mesh.nCells())

...