# The blocks

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 August 24, 2009, 06:18 The blocks #1 New Member   Miro Join Date: Aug 2009 Posts: 14 Rep Power: 9 Hi guys, does anybody know what is important if I want to define blocks in blockMeshDict... If there is an block with 8 vertices, what is the rule to defining the vertex numbers: is hex (0 1 2 3 4 5 6 7) the same like any other order of vertex numbers for example hex (1 4 6 2 7 0 5)? It is not the same but what is the rule? Thanks

August 24, 2009, 07:26
#2
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Sebastian Gatzka
Join Date: Mar 2009
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You have to be aware that there is a vertex numbering rule concerning the local coordinate system of the block.

It is described in the User Guide Chapter 5.3:
http://www.opencfd.co.uk/openfoam/do...#x25-1400005.3

Quote:
 The local coordinate system is defined by the order in which the vertices are presented in the block definition according to: the axis origin is the first entry in the block definition, vertex 0 in our example; the direction is described by moving from vertex 0 to vertex 1; the direction is described by moving from vertex 1 to vertex 2; vertices 0, 1, 2, 3 define the plane ; vertex 4 is found by moving from vertex 0 in the direction; vertices 5,6 and 7 are similarly found by moving in the direction from vertices 1,2 and 3 respectively.
Hope this helps!
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 August 24, 2009, 09:52 Hi #3 New Member   Miro Join Date: Aug 2009 Posts: 14 Rep Power: 9 Thank you very much. It will be helpful!

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