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Old   June 30, 2009, 19:04
Default ICEM HDF Connectivity
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Hello All,

I've been given a simple, 5 block, structured mesh of a cylinder generated in ICEM and exported in the HDF5 format. Unfortunately, it seems that the transformation vector given in the ICEM-generated HDF5 file is not consistent with the SIDS-CGNS standard. Would anyone happen to know what the relationship of the <Constant Index, First Index, Second Index> to the SIDS connectivity standard is for structured meshes?

Thanks
-Glockenspiel
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Old   July 2, 2009, 00:43
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Thought I'd update this for anyone else that might encounter the problem. The ICEM generated <Constant Index, First Index, Second Index> for the current block patch correspond (more or less) to the index locations of the standard SIDS transformation vector. The donor patch <Constant Index, First Index, Second Index> values are then substituted into the transformation vector.

I.E.
My Block Vector
<1,2,3> (these are you index values)
Donor Block Vector
<3,1,2>

...substituting the first value yields:
<3,_,_>
the second:
<3,1,_>
finally:
<3,1,2>

Of course, you'll need to program in some sort of logic to consider the bounds of the abutting faces (i.e. a i-low abutting against a k-low face) and for the case where you might have a negative value in one of the block indices indicating the start/end nodal locations differ between the blocks.


At any rate, I hope this can help someone...if clarification is needed just post a reply and I'll do my best to assist.
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