Hello,
I'm currently employed at offical SolidWorks reseller in Serbia, where I'm working as application engineer for SolidWorks&PDM Technical Support engineer for our clients from various area of mechanical engineering and solving their problems, such as cad administration, sheet metal, weldment constrruction, complex shapes and surface, mold tooling, drafting, large assemblys, Enterprise PDM administration, FEA simulation, FLOW Simulation etc.
I can examine your problem with SolidWorks Flow Simulation and see more clearly what is happening in narrow channel. I can make a several configuration of your project to determine optional solution and send you FLV file which contains results, among 3D model. I just passed Flow Simulation Certification and I'm officially support engineer for Flow package. Just recently i have had a customer that were having problem with mixture ratio of two fluids in his narrow channel mixture pump.
Highly skilled with SolidWorks as you can see in my portfolio. Contact me if you estimate that I could help you.
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Regards Ivan