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voxel sampling

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hello all~


i made little same thing that created by masterclass at http://www.sidefx.com/index.php?option=com_content&task=view&id=2200&Itemid=344 for study


i made hip file is one of the masterclass give us various hip file

one is free surface hip file


my question is

surface field in gas project non divergnet dop is only work when voxel sampling set to face in vel field

but i don't know why i have to do it


maybe i guess i don't know principle about it


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It is mathematically convenient to store the velocities and densities/pressures in different locations, as then you can use central differences to get the differential of one in the location of the other. This is called a MAC stggered grid, you can google for it, but the best explanation I've ran into is in Bridson's book.


And, by the way, this staggered configuration is the reason why the flip velocity fields have different resolutions in different component volumes - in case someone has been wondering (I did:)



Edited by eetu
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