[devlaam]

Hi,

I cannot find an example or solution for this probably very simple newbie problem. I work with electrostatics, but i do not think this is relevant, it is an general issue.

I defined two cubes of size 1 next to each other, called left and right. If can define a uniform charge density in both cubes. With

internalField   uniform 1e-3;

and that works well, but how do define it in just one cube? I tried adding an "internal plane" in the blockMeshDict, but that is not acceptable it seems. And even if it were, how do i designate that space, it seems only the faces can have names. Somehow i am missing something quite obvious here.

I really appreciate any help.

These are my test files:

FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 1;

vertices
(   (1 0 0) //0
    (1 1 0) //1
    (0 1 0) //2
    (0 0 0) //3
    (1 0 1) //4
    (1 1 1) //5
    (0 1 1) //6
    (0 0 1) //7
    (1 2 0) //8
    (0 2 0) //9
    (1 2 1) //10
    (0 2 1) //11
);

blocks
(   hex (0 1 2 3 4 5 6 7)   (5 5 5) simpleGrading (1 1 1)
    hex (1 8 9 2 5 10 11 6) (5 5 5) simpleGrading (1 1 1) );

boundary
(
  topleft
  { type patch;
    faces ( (4 5 6 7) ); }

  topright
  { type patch;
    faces ( (5 10 11 6) ); }
    
  bottomleft
  { type patch;
    faces ( (3 2 1 0) ); }

  bottomright
  { type patch;
    faces ( (2 9 8 1) ); }

  frontleft
  { type patch;
    faces ( (4 5 1 0) ); }

  frontright
  { type patch;
    faces ( (5 10 8 1) ); }

  backleft
  { type patch;
    faces ( (2 6 7 3) ); }

  backright
  { type patch;
    faces ( (9 11 6 2) ); }

  leftleft
  { type patch;
    faces ( (0 4 7 3) ); }

  rightright
  { type patch;
    faces ( (9 11 10 8) ); }

// This does not work?    
//  middle
//  { type internal;
//    faces ( (1 2 6 5) ); }

);

mergePatchPairs
(
);

FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    object      rho;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 -3 1 0 0 1 0];

// how to define this only for the left cube???
internalField   uniform 1e-3;

boundaryField
{
  topleft
  { type fixedValue;
    value uniform 0; }

  topright
  { type fixedValue;
    value uniform 0; }
    
  bottomleft
  { type fixedValue;
    value uniform 0; }

  bottomright
  { type fixedValue;
    value uniform 0; }

  frontleft
  { type fixedValue;
    value uniform 0; }

  frontright
  { type fixedValue;
    value uniform 0; }

  backleft
  { type fixedValue;
    value uniform 0; }

  backright
  { type fixedValue;
    value uniform 0; }

  leftleft
  { type fixedValue;
    value uniform 0; }

  rightright
  { type fixedValue;
    value uniform 0; }
    
}

[wyldckat]

Hi devlaam,

I'm guessing that you read the User Guide waaaay too fast

This is explained here: http://www.openfoam.org/docs/user/da...#x7-530002.3.3 (section "2.3.3 Setting initial field")

Best regards,
Bruno

[devlaam]

Yep, guess you where right.
Works like a charm now.
The biggest problem for the newbies is, i think, that we all have a idea how this should work, but that is not the way it works ...
Thanks for your support!