# Difference between bubblefoam and twophaseeulerfoam

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 January 15, 2008, 16:30 Hello, what is the differen #1 New Member   Enrico Bärow Join Date: Mar 2009 Location: Germany Posts: 2 Rep Power: 0 Hello, what is the difference between those two? Both are based on H. Rusche, use Euler-Euler and k-epsilon. I'm trying to solve a water flow with air being injected. Although this might be an unsteady process is it possible to solve steady state (with one of these solver)? Thanks! Enrico

 January 29, 2008, 12:51 I was told that twoPhaseEulerF #2 Member   Sung-Eun Kim Join Date: Mar 2009 Posts: 76 Rep Power: 9 I was told that twoPhaseEulerFoam has some additional models that allow granular flows. bubbleFoam came forst, and twoPhaseEulerFoam, an extended version came later.

 February 3, 2008, 09:12 Thanks! So I thing both will #3 New Member   Enrico Bärow Join Date: Mar 2009 Location: Germany Posts: 2 Rep Power: 0 Thanks! So I thing both will be suitable for my problem..

 March 14, 2009, 07:55 Hi..Enrico Barow and others #4 Member   Raghavendra Join Date: Mar 2009 Location: Goteborg, Sweden Posts: 94 Rep Power: 9 Hi..Enrico Barow and others my task is to simulate air particle being injected (at the center) to the water as continuous medium. (Becker case) (Domain being simple 2D rectangular region sides and bottom (except at the center) being walls. Velocity inlet at the center and pressure outlet at the top) Boundary conditions 1) alpha 0 gradients at the wall 2) inlet uniform 1 3) 3/4 th water (continous phase) filled so alpha being eual to 0 and remaining 1/4 air(discrete phase) and alpha being 1 4) alpha being 1 at the "top" where pressure outlet boundary conditions are set top { type inletOutlet; inletValue uniform 1; value uniform 1; } 5) at the inlet region alpha being 1 velocity-inlet { type fixedValue; value uniform 1; } am using twoPhaseEulerFoam solver also I would like to know which could be the best solver when compare with bubbleFoam (turbulence being on) Simulation errors: When I try with these boundary conditions for alpha and with 0.9 m/s velocity at the inlet (air velocity) diameter of the particle being 0.00003 m after few iterations courant number increase (around thousands!!) though the grid is not that fine also very small time step being employed. Finally simulation crashes :-( I want to know whether boundary conditions are to be altered or there I have to modify the solver and recompile again!!?? Awaiting for replies! Regards Raghavendra

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