[Gmsh] Structured partition of a structured mesh

[Marc]

Hi,

I have a simple 2D square geometry and I created a structured mesh for it 
(attached file square.geo). I would like to partition it in a structured 
fashion (for parallel simulations). I would like the partitions to be 
square and not look unstructured as they are in the attached picture 
partition.jpeg (I colored the surfaces with their partition number). I 
generated the mesh with the command gmsh -2 -order 1 -part 20 square.geo -o 
square.msh. I compiled gmsh on my own so I have access to METIS and CHACO. 
I have played around with the parameters for METIS and CHACO but I can't 
get it to do what I want (I've tried all sorts of combinations). I have 
also tried the plugin "SimplePartition" but that only creates 1D "bands" 
(see bands.jpeg). 

I was wondering if there was a way to do a structured partition of this 
mesh (this is so that it's more efficient when running in parallel: to 
minimize communication time between processors by decreasing the number of 
neighbors and the surface area of each partition, etc).

Thank you very much!

Marc
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