Volume fraction correction exponent / Grace Model

Math13570 · October 2, 2013, 11:10

Hi guys,
I have a simulation of multiphase flow (Water flow in a conduct with air injection by a hydrofoil place in the middle) and I use the grace drag model. I inject 1mm bubbles diameter. I notice that the volume fraction correction exponent have influence on my solution (Crash or not

). I read the help menu in Ansys for this correction exponent but not give enough info...For small bubble use a value of -1, and larger bubble a value of 4...I did a little search on the net for more info but i didn't have succes, has anyone have some infos, links to give me about that?

Thank you

Math

Gert-Jan · August 21, 2018, 06:02

I would like to raise this question again.

Mathieu, did you (or someone else) find anything on this topic? I am desperately looking for it.

October 2, 2013, 11:10	Volume fraction correction exponent / Grace Model	#1
Math13570 New Member Mathieu Join Date: Oct 2013 Location: Sherbrooke Posts: 8 Rep Power: 13	Hi guys, I have a simulation of multiphase flow (Water flow in a conduct with air injection by a hydrofoil place in the middle) and I use the grace drag model. I inject 1mm bubbles diameter. I notice that the volume fraction correction exponent have influence on my solution (Crash or not ). I read the help menu in Ansys for this correction exponent but not give enough info...For small bubble use a value of -1, and larger bubble a value of 4...I did a little search on the net for more info but i didn't have succes, has anyone have some infos, links to give me about that? Thank you Math

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August 21, 2018, 06:02		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,928 Rep Power: 28	I would like to raise this question again. Mathieu, did you (or someone else) find anything on this topic? I am desperately looking for it.