Drag Force - newbie!

bioflow · February 21, 2012, 08:40

Looking for advice on what drag force constant to use for a multiphase flow (particle in water)

Also keep getting divergence instead of convergence, looking for any possible advice?

ryancoe · February 23, 2012, 17:51

Can you elaborate a little? What do you mean by a drag force constant?

Divergence of a solution can occur for a wide range of reasons. A good place to start would be your temporal and spacial discretizations (i.e. your time step and your mesh size) of your simulation.

bioflow · February 24, 2012, 05:16

Sorry, I should have been more specific!

I'm running multiphase segregated flow, with two Eulerian phases - water, and a suspended particle. I'm wondering what drag force co-efficient to use for the phase interaction? Re = 800.

February 21, 2012, 08:40	Drag Force - newbie!	#1
bioflow New Member Join Date: Feb 2012 Posts: 7 Rep Power: 14	Looking for advice on what drag force constant to use for a multiphase flow (particle in water) Also keep getting divergence instead of convergence, looking for any possible advice?

February 23, 2012, 17:51		#2
ryancoe Member Ryan Coe Join Date: Jun 2010 Location: Albuquerque, NM Posts: 98 Rep Power: 15	Can you elaborate a little? What do you mean by a drag force constant? Divergence of a solution can occur for a wide range of reasons. A good place to start would be your temporal and spacial discretizations (i.e. your time step and your mesh size) of your simulation. __________________ Ryan

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February 24, 2012, 05:16		#3
bioflow New Member Join Date: Feb 2012 Posts: 7 Rep Power: 14	Sorry, I should have been more specific! I'm running multiphase segregated flow, with two Eulerian phases - water, and a suspended particle. I'm wondering what drag force co-efficient to use for the phase interaction? Re = 800.