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openfoam define a zero value volscalarfield

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Old   February 4, 2016, 08:00
Default openfoam define a zero value volscalarfield
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Luis Lencina
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Hi everyone,

I'm trying to program a solver and its need a volscalarfield that initially must be zero everywhere in the mesh and I don't want to read it from any initial condition or to write it down. Anyone know how to do it?

thanks in advance Luis
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Old   February 4, 2016, 10:26
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Alexey Matveichev
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Hi,

Just an example:

Code:
$ sol
$ grep -r volScalarField *
...lots of output...
stressAnalysis/solidDisplacementFoam/readThermalProperties.H
...
$ less stressAnalysis/solidDisplacementFoam/readThermalProperties.H
Go to line 16.

Another:

Code:
$ src
$ cd turbulenceModels/incompressible/turbulenceModel/laminar
$ less laminar.C
Go to line 90 (this one maybe a little bit too complicated, since involves certain things in addition to field creation).
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Old   February 4, 2016, 10:57
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Luis Lencina
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Thanks alexeym,

I was wondering if there were some way to avoid to create the IOobject, or at least dont have to write it down.
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Old   February 4, 2016, 10:58
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Hi Luis,

For example for vol scalar field alpha

volScalarField Temp
(
IOobject
(
runTime.timeName(),
mesh,
IOobject::NO_READ,
IOobject::AUTO_WRITE
),
dimensionedScalar("Temp",dimensionSet(0,0,0,0,0,0, 0),0)
);
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Old   February 4, 2016, 11:22
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@LUIS1717

If you take a look at GeometricField class documentation (http://foam.sourceforge.net/docs/cpp/a00912.html, volScalarField is just a typedef GeometricField<scalar, fvPatchField, volMesh>), it can be created either as a copy of another GeometricField, or on the base of IOobject.

So in brief, no, you can not avoid IOobject constructor.

Surely if you really-really-really hate IOobject constructor, you can create wrapper taking field name, dimensions, and mesh as parameters and returning autoPtr.
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Old   April 16, 2016, 15:16
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Quote:
Originally Posted by LUIS1717 View Post
Hi everyone,

I'm trying to program a solver and its need a volscalarfield that initially must be zero everywhere in the mesh and I don't want to read it from any initial condition or to write it down. Anyone know how to do it?

thanks in advance Luis
Here's a REALLY ugly hack, but it's simple, it works and you won't need IOobject.

Code:
volScalarField toto ("use any combination of variables with correct dimensions");
toto *= scalar(0);
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