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Old   August 16, 2009, 06:48
Default Droplet Injection
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Varun
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I have been trying to simulate spray using single orifice atomizer (and pressure swirl atomizer) injector models. Liquid Diesel droplets into ambient air.

I have a doubt regarding use of Species Transport.

When I select a mixture in the species transport does it define the fluid domain as the mixture....??

The Particle Type = Droplet is disabled in the injector definition window. I am using k-epsilon turbulance model and also DPM...

I noticed that Droplet option gets enabled when i enable Species Transport. But i'm unable to understand how to get sort out the issue.

I would appreciate it if any one could tell me how to overcome this, or to use droplet model is it compulsary to use Species Transport?? and if yes how do i retain the domain to be ambient air??
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Old   August 18, 2009, 13:41
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Allan Walsh
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What are you trying to do? If you want to see how the vaporized diesel is dispersed, then you need to have an air-diesel mixture. If you only care about the condensed phase (i.e. liquid diesel drops), then the gas could be something else.
Probably, you want to choose air-diesel vapor from the Fluent data base for the fluid (i.e. gas) mixture. Then, chose diesel as the material for the particles from the material set up panel. Good Luck.
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Old   August 18, 2009, 13:47
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Yes I'm looking to injected liquid droplets and have set up the injector to do so....

Nope i'm not looking for vapourization... i'm trying to study droplet distribution...
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Old   August 19, 2009, 12:24
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Allan Walsh
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Sorry, I can't follow what you are trying to do or what your actual problem is.
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Old   August 19, 2009, 12:46
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Varun
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I've managed to sort that particular problem out.... Thank you...

But i've got a couple more doubts.....

1. Pressure Swirl Atomizer in FLUENT does not seem to have an option to specify swirl component. I dont see any swirl in the spray produced by it. Is there any way that the swirl velocity component can be input....?
In simple words - How do i get swirl...???

2. Under advanced DPM Injections where the number of tracked particles, escaped....etc are listed out what does particles shed & incomplete mean...??

Please help....

Regards
Varun
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