Dpm-vof bubble rising

Labsim · June 13, 2024, 21:47

Hi,
I have a problem in a simulation in which I use a vof-dpm coupling. I have a bubble that rises through a phase of the vof and reaches the surface, I use a udf that expands the bubble based on the y coordinate of the particle, but at the same time Getting to the top of the primary phase spreads me out too much.

Martin_Sz · June 14, 2024, 05:29

try to simplify phenomenas , try make simple vof model with implicit solver

Labsim · June 14, 2024, 09:45

Hello Martin
I already tried what you mention, I am running the case in a transient state, with energy equation, and with drag force, gravity, pressure gradient and for the dpm-vof coupling I am using two-way coupling.

The thing is that I have a case without bubble expansion and in that case the phase is not affected or disturbed, by adding the expansion the results that I should obtain should not be such a large dispersion (the continuous phase is dispersed as columns)

June 13, 2024, 21:47	Dpm-vof bubble rising	#1
Labsim New Member Alejandro Join Date: Jun 2024 Posts: 5 Rep Power: 3	Hi, I have a problem in a simulation in which I use a vof-dpm coupling. I have a bubble that rises through a phase of the vof and reaches the surface, I use a udf that expands the bubble based on the y coordinate of the particle, but at the same time Getting to the top of the primary phase spreads me out too much.

June 14, 2024, 05:29		#2
Martin_Sz Senior Member Marcin Join Date: May 2014 Location: Poland, Swiebodzin Posts: 313 Rep Power: 14	try to simplify phenomenas , try make simple vof model with implicit solver __________________ Quick Tips and Tricks, Tutorials FLuent/ CFX (CFD) https://howtooansys.blogspot.com/

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June 14, 2024, 09:45		#3
Labsim New Member Alejandro Join Date: Jun 2024 Posts: 5 Rep Power: 3	Hello Martin I already tried what you mention, I am running the case in a transient state, with energy equation, and with drag force, gravity, pressure gradient and for the dpm-vof coupling I am using two-way coupling. The thing is that I have a case without bubble expansion and in that case the phase is not affected or disturbed, by adding the expansion the results that I should obtain should not be such a large dispersion (the continuous phase is dispersed as columns)