EMC2> I have finished the new simulation more precise than the others but with more computer time
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Pic about speed into a maze2 (red is high flow, blue is low flow)
We can see well the "unsticking" (in blue) at each corner of the maze due to a high speed of the water flow. And as you say EMC2 I have modeled a sub-portion as the pic below to view if breaking the corner of my waterblock can improve speed at the wall near the corner and "down" the boundary layer.
With this sub-portion I can put a big number of nodes (meshing) in order to have a good description of the phenomenom to view if a chamfer is necessary or not.
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