Multiphase model

marsa27 · October 31, 2019, 04:41

Hi,

I want to simulate the forming of a glass bottle inside a mold. I want to use a VOF model. Does anyone have advice on using a homogeneous or inhomogeneous model? In the inhomogeneous case how do you set up a sensible Drag coefficient? Furthermore, what about the morphology of the material what would you set to glass and what to air? Continuos fluid for both? Or dispersed fluid?

Gert-Jan · October 31, 2019, 08:14

To be honest, I would not use CFX for this but e.g. Moldflow.

marsa27 · October 31, 2019, 08:30

Instead in CFX how would you set this problem?

ghorrocks · October 31, 2019, 17:03

Ignoring the fact that CFX is not ideal for this simulation.....

My understanding of glass blowing is that the glass has a coherent free surface interface for the entire process, so no bubbles, foam or mist. In this case a homogenous free surface model should be suitable. This means drag coefficients are not required.

For tips on how to set up a free surface simulation look at the CFX tutorial examples. "Free surface flow over a bump" is the relevant here I think.

October 31, 2019, 04:41	Multiphase model	#1
marsa27 Senior Member Davide Join Date: Jul 2015 Posts: 107 Rep Power: 10	Hi, I want to simulate the forming of a glass bottle inside a mold. I want to use a VOF model. Does anyone have advice on using a homogeneous or inhomogeneous model? In the inhomogeneous case how do you set up a sensible Drag coefficient? Furthermore, what about the morphology of the material what would you set to glass and what to air? Continuos fluid for both? Or dispersed fluid?

October 31, 2019, 17:03		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	Ignoring the fact that CFX is not ideal for this simulation..... My understanding of glass blowing is that the glass has a coherent free surface interface for the entire process, so no bubbles, foam or mist. In this case a homogenous free surface model should be suitable. This means drag coefficients are not required. For tips on how to set up a free surface simulation look at the CFX tutorial examples. "Free surface flow over a bump" is the relevant here I think. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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October 31, 2019, 08:14		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	To be honest, I would not use CFX for this but e.g. Moldflow.

October 31, 2019, 08:30		#3
marsa27 Senior Member Davide Join Date: Jul 2015 Posts: 107 Rep Power: 10	Instead in CFX how would you set this problem?