check: generation of hexahedral meshes

docs/documentation/tutorials/generationofhexahedralmeshes.md

@@ -1,6 +1,6 @@
 # Generation of Hexahedral Meshes
 
-As many solvers require purely hexahedral meshes, HOPR implements a subdivision strategy to split meshes consisting of tetrahedra, prisms and hexahedra into purely hexahedral meshes. This feature is activated using the parameter `splitToHex=T`. Note, that pyramids cannot be decomposed to hexahedra in a straightforward way, thus this feature cannot be applied to meshes containing pyramids. Note also that this option is up to now restricted to linear meshes. 
+Since many solvers require purely hexahedral meshes, HOPR implements a subdivision strategy to split meshes consisting of tetrahedra, prisms and hexahedra into purely hexahedral meshes. This feature is activated using the parameter `splitToHex=T`. Note, that pyramids cannot be decomposed to hexahedra in a straightforward way, thus this feature cannot be applied to meshes containing pyramids. Also note that this option is currently limited to linear meshes.
 
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@@ -25,6 +25,6 @@ As many solvers require purely hexahedral meshes, HOPR implements a subdivision
 
 <h4>Parameter File<a class="headerlink" href="#parameter-file" title="Permalink to this heading"></a></h4>
 
-To test this feature, set elemtype to either 104 or 106 and add `splitToHex=T` to the parameter file, which is found in
+To test this feature, set `elemtype` to either `104` (Tetrahedron) or `106` (Prism with triangular base) and add `splitToHex=T` to the parameter file, which is found in
 
     tutorials/1-01-cartbox/parameter.ini

docs/documentation/userguide/parameters.md

@@ -53,7 +53,7 @@ width: 50px
 | `R_INF` |  `R_INF=20` | Real      |  1           |   MANDATORY<br>if Mode=11     |  Outer radius of curved structured mesh     |
 | `SpaceQuandt` |  `SpaceQuandt=1.0` | Real      |  1       | 0.1     |   Characteristic length of the mesh      |
 | `SplitElemFile` |  `SplitElemFile=filename` | Str      |  1       | MANDATORY<br>if curvingMethod=3    |    Name of suvdivided surface mesh       |
-| `SplitToHex` |   	`SplitToHex=T` | Logical      |  1       | F    |   If `SplitToHex=F` then tetrahedra and prisms are subdivided to yield pure hexahedral meshes meshes. <br>Hexahedra are also subdivided to guarantee a conforming connection. <br>NOTE: Pyramids cannot be split, this function cannot be used with pyramids present in the mesh.        |
+| `SplitToHex` |   	`SplitToHex=T` | Logical      |  1       | F    |   If `SplitToHex=F` then tetrahedra and prisms are subdivided to yield pure hexahedral meshes. <br>Hexahedra are also subdivided to guarantee a conforming connection. <br>NOTE: Pyramids cannot be split, this function cannot be used with pyramids present in the mesh.        |
 | `stretchType` |   `stretchType=(/3,1,0/)` | Int      |  3       | (/0,0,0/)     |   This parameter manages the (de)activation of the stretching functions for all axis. For this reason the parameter <br>is a vector with three components.<br>0: Stretching in direction of the axis is deactivated<br>1: Stretching in direction of the axis is activated<br>3: Stretching in direction of the axis is activated and from the second half of the mesh distance on the stretching <br>factor is multiplied by -1.     |
 | `useCurveds` | `useCurveds=T` | Logical      |  1       | F     |   T (True): If curved boundaries are defined<br>F (False): If no curved boundaries are defined     |
 | `vv` | `vv=(/0,0,1./)` | Real      |  3       |  (/0,0,0/)     |   The displacement vector has to specify in the three-dimensional cartesian coordinate system and has to be <br>normal to a surface the vector was assigned to. In addition the displacement vector has to show to the inside <br>of the cartesian box. In case of two parallel surface-planes, both with periodic boundary conditions, just one <br>displacement vector has to be defined. Therefore the different directions of the vectors can be compensated <br>by switching the sign of alpha, the fourth component of the `BoundaryType` vector.<br>The displacement vector has to be as long as the distance between the surfaces the vector was assigned to. <br>The index of a displacement vector is defined by the position of its definition like the parameter `BCIndex`. <br>Several definitions of boundary conditions between two definitions of displacement vectors will not affect <br>the index of the displacement vectors.     |