impingement jet injector

Hawxliquid · February 25, 2017, 14:08

Hello.
I am trying to simulate the impigement of water jets on each other ( like this : http://heroicrelics.org/info/f-1/f-1...t-patterns.jpg )

What should I use ? VOF ? DPM ? Is there any tutorial that could help me ? Thanks ! ( Also, I tried with VOF, but I seem to have a lot of issues, and I Can't even define the velocity inlet.. )

Thank you !

LuckyTran · February 25, 2017, 18:29

The DPM model is more appropriate for discrete phases, like a particle moving around in your flow. I think a volume-fraction approach is more suitable. Try the VOF model or a full Euler-Euler model.

Btw Fluent only has a primary liquid jet breakup model, it can't simulate secondary breakup. So don't be surprised if results don't match. I.e. the jet that comes out of these mostly evaporate and they don't slowly break down into droplets. It does have a primary atomization model though, which just assumes that your liquid jet has already broken into droplets as soon as it enters the domain.

daniel_pramudita · February 9, 2018, 14:43

Hi LuckyTran,

I got confused with your statement that Fluent doesnot have secondary breakup models. As far as I know, it explicitly provide some secondary breakup models (for droplet, I believe), which are in the DPM.
What case are you referring here?

Daniel

February 25, 2017, 14:08	impingement jet injector	#1
Hawxliquid New Member Boris Join Date: Jan 2017 Posts: 26 Rep Power: 9	Hello. I am trying to simulate the impigement of water jets on each other ( like this : http://heroicrelics.org/info/f-1/f-1...t-patterns.jpg ) What should I use ? VOF ? DPM ? Is there any tutorial that could help me ? Thanks ! ( Also, I tried with VOF, but I seem to have a lot of issues, and I Can't even define the velocity inlet.. ) Thank you !

February 9, 2018, 14:43	No secondary breakup?	#3
daniel_pramudita New Member Join Date: Jan 2018 Posts: 12 Rep Power: 8	Hi LuckyTran, I got confused with your statement that Fluent doesnot have secondary breakup models. As far as I know, it explicitly provide some secondary breakup models (for droplet, I believe), which are in the DPM. What case are you referring here? Daniel

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February 25, 2017, 18:29		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,752 Rep Power: 66	The DPM model is more appropriate for discrete phases, like a particle moving around in your flow. I think a volume-fraction approach is more suitable. Try the VOF model or a full Euler-Euler model. Btw Fluent only has a primary liquid jet breakup model, it can't simulate secondary breakup. So don't be surprised if results don't match. I.e. the jet that comes out of these mostly evaporate and they don't slowly break down into droplets. It does have a primary atomization model though, which just assumes that your liquid jet has already broken into droplets as soon as it enters the domain.