[biscarri]

Hi foamers,

I'm trying to create parametrized meshes using blockMesh and snappyHexMesh.

Is it possible to define user variables at the beggining of blockMeshDict and snappyHexMeshDict, and then to use them in algebraic expressions to input the values of meshing parameters?

Can somebody explain me how?

Thank you very much,
Lluis

[ufocfd]

good question - did you find a way to do this?

[Tobermory]

You can define the variables in a separate file, and then include them at the top of the blockMesh and snappyHexMesh dictionaries with an #include command, remembering that the path is relative to the location of the dictionary.

For example, in your case folder, create a folder called include, and in that folder create a file variables, eg:

/*--------------------------------*- C++ -*----------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  dev
     \\/     M anipulation  |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       IOobject;
    location    "include";
    object      variables;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
U0      3.0;
p0      0.0;
k0      0.8;
eps0    0.03;

Now, in the dictionary where you want to reference these variables, just add an include statement, e.g.:

#include "../include/variables"

and the variables will be defined and ready for use below. You can use #calc or codestream to do calculations based on these variables, if you need. Hope that helps.