diff --git a/openfoam/run/flowAroundCylinder/system/blockMeshDict b/openfoam/run/flowAroundCylinder/system/blockMeshDict
index d338f48bccd938dda8ed3dfa56e53c730b8a507f..f04b0f9319c7763fb32d3db8c84688016d06dc16 100644
--- a/openfoam/run/flowAroundCylinder/system/blockMeshDict
+++ b/openfoam/run/flowAroundCylinder/system/blockMeshDict
@@ -18,57 +18,58 @@ convertToMeters 0.01;  // centimetres.  According to https://cfd.direct/openfoam
 
 #include "../scale";  // gives global N
 rx 3.5355339059327373;
+// = // rx #calc "5.0 / Foam::sqrt(2.0)";  // length of short side of rectangular triangle with long side =5
 
 arcNx #calc "50 * $N";
 arcNy #calc " 30 * $N";
 
-// = // rx #calc "5.0 / Foam::sqrt(2.0)";  // length of short side of rectangular triangle with long side =5
+thickness 100;    // in other files 0.5 = 50 cm = 50 is assumed to be a valid z coordinate (probes)
 
 vertices
 (
-    // F = front (z = 0), B = back   (z = 1)
+    // F = front (z = 0), B = back   (z = $thickness)
     // bottom = b, t = top, n = middle (left/right of center of cylinder)
     // l = left, r = right, m = middle (under center of cylinder), s = other square around cylinder corner
     // c = cylinder
     // (0, 0, 0) = center of cylinder in front
     name Fbl (-20 -20 0)
-    name Bbl (-20 -20 1)
+    name Bbl (-20 -20 $thickness)
     name Fbs (20 -20 0)
-    name Bbs (20 -20 1)
+    name Bbs (20 -20 $thickness)
     name Fbr (200 -20 0)
-    name Bbr (200 -20 1)
+    name Bbr (200 -20 $thickness)
     name Ftl (-20 21 0)
-    name Btl (-20 21 1)
+    name Btl (-20 21 $thickness)
     name Fts (20 21 0)
-    name Bts (20 21 1)
+    name Bts (20 21 $thickness)
     name Ftr (200 21 0)
-    name Btr (200 21 1)
+    name Btr (200 21 $thickness)
     name Fcl (-5 0 0)
-    name Bcl (-5 0 1)
+    name Bcl (-5 0 $thickness)
     name Fcb (0 -5 0)
-    name Bcb (0 -5 1)
+    name Bcb (0 -5 $thickness)
     name Fcr (5 0 0)
-    name Bcr (5 0 1)
+    name Bcr (5 0 $thickness)
     name Fct (0 5 0)
-    name Bct (0 5 1)
+    name Bct (0 5 $thickness)
     name Fcbl (#calc "-$rx" #calc "-$rx" 0) 
-    name Bcbl (#calc "-$rx" #calc "-$rx" 1) 
+    name Bcbl (#calc "-$rx" #calc "-$rx" $thickness) 
     name Fcbr ($rx #calc "-$rx" 0)
-    name Bcbr ($rx #calc "-$rx" 1)
+    name Bcbr ($rx #calc "-$rx" $thickness)
     name Fctl (#calc "-$rx" $rx 0) 
-    name Bctl (#calc "-$rx" $rx 1) 
+    name Bctl (#calc "-$rx" $rx $thickness) 
     name Fctr ($rx $rx 0)
-    name Bctr ($rx $rx 1)
+    name Bctr ($rx $rx $thickness)
     name Fnl (-20 0 0)
-    name Bnl (-20 0 1)
+    name Bnl (-20 0 $thickness)
     name Fnr (200 0 0)
-    name Bnr (200 0 1)
+    name Bnr (200 0 $thickness)
     name Fbm (0 -20 0)
-    name Bbm (0 -20 1)
+    name Bbm (0 -20 $thickness)
     name Ftm (0 21 0)
-    name Btm (0 21 1)
+    name Btm (0 21 $thickness)
     name Fns (20 0 0)
-    name Bns (20 0 1)
+    name Bns (20 0 $thickness)
     name Fnm (0 0 0)  
     name Bnm (0 0 1)
 );