Unable to incorporate buoyancy force in fluent- vof multiphase -- CFD Online Discussion Forums

May 3, 2019, 14:48

Unable to incorporate buoyancy force in fluent- vof multiphase

Outrageous

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Outy

Join Date: Feb 2018

Posts: 12

Rep Power: 8

Hello, I'm trying to simulate the bubble formation from a submerged capillary and the bubble forms but just sticks to the capillary instead of rising up in the liquid.

Below are the model specifics:

Interface tracking: VOF
Interface construction: Geo reconstruction
Pressure coupling: PISO and PRESTO
Time : Implicit
global courant number: 0.5;
time step variable starting with 1e-9 seconds
Inlet velocity: 2.49 m/s
orifice diameter: 0.32 mm

Please see attached images for reference:

Attached Images

	BC's.PNG (75.4 KB, 6 views)
	Contour 1.JPG (151.6 KB, 5 views)
	parameters.PNG (84.8 KB, 6 views)

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