Volume fraction correction exponent / Grace Model

Math13570 · October 2, 2013, 10:10

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, 05:02

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, 10:10	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

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
mass flow in is not equal to mass flow out	saii	CFX	12	March 19, 2018 05:21
Simulation of a single bubble with a VOF-method	Suzzn	CFX	21	January 29, 2018 00:58
alphaEqn.H in twoPhaseEulerFoam	cheng1988sjtu	OpenFOAM Bugs	15	May 1, 2016 16:12
Difference between Volume Fraction and Mass Fraction in CEL	foo7	CFX	0	September 21, 2011 08:45

August 21, 2018, 05:02		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,971 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.