Modelling flow through small gaps
I am currently simulating a case where a check valve is present. I would like to obtain as an output from my simulation the flowrate decrease as a result of valve closure.
The point is, the gap is about 10 microns and refining the mesh on this gap area makes the simulation becoming unfeasible, as the elements number increases beyond my computational capabilities.
I wonder if there is any tutorial regarding this kind of clearance flows that could help me, furthermore, I have heard some folks talking about manipulating the dynamic viscosity of cells in gap so the flow becomes restricted through that clearance, keeping at the same time a limited number of elements. Is this last procedure possible? Are there any examples available related to this kind of problem?