[arieljeds]

Hi there,
I'm trying to write a blockmesh file using variables for the vertices and the number of cells but I'm not quite sure how to do this. At the moment, I'm trying this:

convertToMeters 1;

x   20.0;	// Length of tank
y1  -3.0;	// Width of tank/2
y2   3.0;	// Width of tank/2
zf  -0.4;	// Water depth 
za   0.2;    	// Distance above free surface
L    3.6942;    // Wavelength 
n    5;	        // Number of cells per wavelength 

xn   ($x/$L)*$n;	// Calculating the number of cells
//yn    
//zn 

vertices        
(
    ( 0   $y1  $zf )	 // 0		
    ( $x  $y1  $zf )     // 1
    ( $x  $y2  $zf )	 // 2
    ( 0   $y2  $zf )	 // 3
   
    ( 0   $y1  $za )	 // 4 
    ( $x  $y1  $za )	 // 5
    ( $x  $y2  $za )	 // 6
    ( 0   $y2  $za )	 // 7    
);

blocks 
         
(
  hex (0 1 2 3 4 5 6 7) ($xn 10 10) simpleGrading (1 1 1) //(1 10 0.1)
);

edges           
(
);

boundary         
( 
   inlet
   {
       type patch;
       faces
   	(
       	 ( 0 3 7 4 )
   	);
   }
   
   outlet
   {
       type patch; 
       faces
   	(
          ( 1 2 6 5 )
   	);
   }
   
   atmosphere
   {
       type patch;
       faces
   	(
          ( 4 5 6 7 )
   	);
   }
   
   front
   {
       type symmetryPlane;
       faces
  	(
       	  ( 3 2 6 7 )
        );
   }

Perhaps unsurprisingly, I'm running into problems with the line where I am attempting to calculate xn. Does anyone know the syntax how I can do this? Or if it's possible at all to do a simple calculation in the blockMeshDict?

Thanks in advance for any advice