Simulating bubble rise

MartiJ · July 15, 2010, 09:18

Hey,

I would like to know, if it is possible to calculate only the bubble rise movement inside a liquid column.

The case is that I ran the calculation for liquid flow in the beginning, to get the steady state values. Now I need to inject bubbles and calculate their terminal velocities in the pre-found flow field.
It takes a lot of resource to run the flow all the time again, so could I just run the bubbles (Lagrangian phase) separately?

Thanks in advance!

TomK · July 15, 2010, 17:54

Why not use Volume of Fluid - or as CD-Adapco calls it now, MultiFluid? If there isn't any heat / mass transfer between the phases it should be easy to do.

MartiJ · July 16, 2010, 04:55

I think that the injectors are really useful and convenient anyway to use. If I'll do it in MultiFluid way, I think it wouldn't be more suitable and then one needs still to calculate the whole flow field over and over again. Just need to change the diameter of a bubble, run the case (without running the bulk flow again), change the d again etc..

and_ · July 21, 2010, 11:18

You can freeze solving the flow field by setting the AMG solver Max Cycles for Velocity and Pressure to 0.

Don't use the Solver Frozen option or you might get problems with unallocated variables

July 15, 2010, 09:18	Simulating bubble rise	#1
MartiJ New Member Marti J Join Date: Jul 2010 Location: swe Posts: 14 Rep Power: 15	Hey, I would like to know, if it is possible to calculate only the bubble rise movement inside a liquid column. The case is that I ran the calculation for liquid flow in the beginning, to get the steady state values. Now I need to inject bubbles and calculate their terminal velocities in the pre-found flow field. It takes a lot of resource to run the flow all the time again, so could I just run the bubbles (Lagrangian phase) separately? Thanks in advance!

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July 15, 2010, 17:54		#2
TomK New Member Tom Keheley Join Date: May 2010 Location: Washington State, USA Posts: 18 Rep Power: 15	Why not use Volume of Fluid - or as CD-Adapco calls it now, MultiFluid? If there isn't any heat / mass transfer between the phases it should be easy to do.

July 16, 2010, 04:55		#3
MartiJ New Member Marti J Join Date: Jul 2010 Location: swe Posts: 14 Rep Power: 15	I think that the injectors are really useful and convenient anyway to use. If I'll do it in MultiFluid way, I think it wouldn't be more suitable and then one needs still to calculate the whole flow field over and over again. Just need to change the diameter of a bubble, run the case (without running the bulk flow again), change the d again etc..

July 21, 2010, 11:18		#4
and_ New Member Join Date: Jul 2010 Posts: 11 Rep Power: 15	You can freeze solving the flow field by setting the AMG solver Max Cycles for Velocity and Pressure to 0. Don't use the Solver Frozen option or you might get problems with unallocated variables