Hi. I am very new to comsol software. I have been trying to simulate the fluid flow in a microchannel. I have designed the channel in workplane and extruded it to 50um to get the 3d structure. In the mid of the channel, I have drawn a semi-circle, and extruded it separately to 20um. I though it would act like an obstacle to fluid flow, so the fluid would flow over this obstacle. But after simulation, I found that the fluid just flows through the obstacle(Although I have defined the structure as a solid). Please advice about how to let the fluid to flow over this structure.
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