pressure-swirl atomizer spray simulation

sjtusyc · September 24, 2012, 10:20

Before i do this simulation, i have done some literate work and figured out how to do post analysis.
Because i want to do a simulation with time dependent BC, i chose to use CFX which has powerful CEL.

But i have'n't found anybody do pressure-swirl atomizer spray simulation. So
it is tricky.

Up to now, i have some questions.
For my simulation,PTM model with main-break up and second beak up model is the obvious option.

And think the settings of the drag model/main-break up model/second beak up model is most important.

But there are so much sub-settings that it seems impossible to do all the sensitivity analysis. And some of the model is so complex that i can't understand related settings?

How can i effectively handle these settings. any advice ,thank you.

ghorrocks · September 24, 2012, 22:02

What are you trying to get out of this model? I do not understand what sort of results you are looking for.

sjtusyc · September 24, 2012, 22:26

It is a spray simulation.
I wanna to get SMD and the particle diameter distribution.

ghorrocks · September 25, 2012, 08:06

Are you happy to get the droplet diameters from models like LISA?

Quote:

But there are so much sub-settings that it seems impossible to do all the sensitivity analysis. And some of the model is so complex that i can't understand related settings?

Nobody said CFD was meant to be easy. Your best chance to do a good simulation is to do a good literature study to start off and find out how the models work and how other people have applied them. Then you will know what is important.

sjtusyc · September 25, 2012, 22:50

Quote:

Originally Posted by ghorrocks

Are you happy to get the droplet diameters from models like LISA?

Nobody said CFD was meant to be easy. Your best chance to do a good simulation is to do a good literature study to start off and find out how the models work and how other people have applied them. Then you will know what is important.

Yes, i wanna to use LISA model as main break-up model,not good?
I did some literature work and will go on doing and find out how the models work and how other people have applied them.

ghorrocks · September 26, 2012, 08:10

LISA is fine, I just wanted to know whether you wanted to use a breakup model (eg LISA) or if you wanted to directly model the breakup process with a free surface model. So in your case it seems the breakup model is what you want.

There is a lot of literature on LISA and other spray breakup models. They should give you some idea of how to drive them.

sjtusyc · September 26, 2012, 22:37

Thank you.
I am clear about what model should i use, but not clear about the related sub settings.
Next week is Mid-Autumn Festival and National Day, i have a week holiday.
I will do some literature work at home before i come back to school

ghorrocks · September 27, 2012, 07:43

Yes, the literature is always the starting point when you are doing a new simulation.

September 24, 2012, 10:20	pressure-swirl atomizer spray simulation	#1
sjtusyc Member leo Join Date: Jun 2012 Posts: 98 Rep Power: 13	Before i do this simulation, i have done some literate work and figured out how to do post analysis. Because i want to do a simulation with time dependent BC, i chose to use CFX which has powerful CEL. But i have'n't found anybody do pressure-swirl atomizer spray simulation. So it is tricky. Up to now, i have some questions. For my simulation,PTM model with main-break up and second beak up model is the obvious option. And think the settings of the drag model/main-break up model/second beak up model is most important. But there are so much sub-settings that it seems impossible to do all the sensitivity analysis. And some of the model is so complex that i can't understand related settings? How can i effectively handle these settings. any advice ,thank you. Last edited by sjtusyc; September 24, 2012 at 10:35.

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September 24, 2012, 22:02		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	What are you trying to get out of this model? I do not understand what sort of results you are looking for.

September 24, 2012, 22:26		#3
sjtusyc Member leo Join Date: Jun 2012 Posts: 98 Rep Power: 13	It is a spray simulation. I wanna to get SMD and the particle diameter distribution.

September 26, 2012, 08:10		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	LISA is fine, I just wanted to know whether you wanted to use a breakup model (eg LISA) or if you wanted to directly model the breakup process with a free surface model. So in your case it seems the breakup model is what you want. There is a lot of literature on LISA and other spray breakup models. They should give you some idea of how to drive them.

September 26, 2012, 22:37		#7
sjtusyc Member leo Join Date: Jun 2012 Posts: 98 Rep Power: 13	Thank you. I am clear about what model should i use, but not clear about the related sub settings. Next week is Mid-Autumn Festival and National Day, i have a week holiday. I will do some literature work at home before i come back to school

September 27, 2012, 07:43		#8
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Yes, the literature is always the starting point when you are doing a new simulation.