27 January 2019
- Last edited 29 March 2020
Replace the Multizone method with Hex Dominant method. On the Mesh Details window, type 2.5e-2 mm for the Element Size and you will get a hex mesh. That works in this case, but in general, never use Hex Dominant for CFD meshes because it can create horrible element shapes in the center, where you can't see them. This is not a problem for Structural solvers but is poison for CFD solvers.
Three elements across a fluid channel is way too few to properly compute the flow. You will want at least 10 elements across the channel and smaller elements near the wall.