Ah yes, the "expense" (in computer time) of accurate CFD.
While you're looking at purely the flow side of things, you might find it interesting to do a little bit of look see at the affects of a channel's aspect ratio (height versus width) with respect to flow (but you need to use pressure for the boundary conditions on the channel, not volumetric flow rate).
To save yourself computer time, you can model a sub-portion of a block with a single rectangular channel that has only 1 bend in it's path (U-shaped section) and constant dimensions along it's length.
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