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Drag Force on Moving Sphere with Slip

Posted Sep 7, 2012, 5:49 p.m. EDT Fluid & Heat Version 4.2a 0 Replies

Thomas Leary
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I'm trying to calculate the drag on a particle/droplet translating through a viscous fluid towards a second particle/droplet in a channel. I've successfully used COMSOL to calculate the drag force in the case of hard spheres with a no-slip boundary condition. I would like to compare this to the case of droplets with perfect slip, i.e. viscosity of the
sphere is much lower than that of the fluid in the channel. I wanted to use the Creeping Flow module as I did for the hard sphere case, with the spheres having a Slip boundary condition, but there is no way to have one
sphere translating while also having a slip boundary condition. Setting the b.c. to Slip Velocity gives me a drag result that is only ~10% less than the no-slip case, which is not correct according to the theory. Could
you please advise me what approach to take to model droplets in fluid as perfect slip?
0 Replies Last Post Sep 7, 2012, 5:49 p.m. EDT
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Hello Thomas Leary

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