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Particle tracing in COMSOL 4.2
Posted Dec 1, 2011, 3:30 PM EST Particle Tracing, Fluid, Computational Fluid Dynamics (CFD), Microfluidics, Particle Tracing, Modeling Tools, Parameters, Variables, & Functions, Results & Visualization Version 4.2 5 Replies
Does anybody have negative experiences with particle tracing in COMSOL 4.2 (and NOT 4.2a)? Because I do.
COMSOL simply fails to trace small particles in even very simple situations. I placed a particle with a radius of 10 microns with zero initial velocity in a reservoir filled with still water. Gravity and buoyancy forces were present, of course. The density of the particle was higher than that of water so the particle was supposed to settle down on the bottom of the reservoir. Instead, it went straight up as if it was in an anti-gravitational field. And just by increasing its radius above 40 microns (and not changing anything else) I could make the particle sink.
Isn't that crazy? The particle size should only affect the sedimentation speed but not whether the particle sedimentation actually occurs or not.
Is this "bug" still present in version 4.2a? If yes, how could I use COMSOL for reliable particle tracing in microfluidic systems and laminar flows?