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Help with modeling a spray from a nozzle

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Old   January 15, 2020, 18:35
Default Help with modeling a spray from a nozzle
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David
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Hi,
I am pretty new to Ansys and I am currently working on this seemingly easy problem with Ansys Fluent.

I am modeling the spray from a particular nozzle, and I am mainly concerned with studying the droplets from this spray at a given point (in particular the droplet dispersion and droplet diameters)

The type of dispersion I am looking for is produced by a Hollow Cone Spray, which matches the droplet dispersion created by the "pressure swirl atomizer" injection type.

The spray liquid would be water, and it would be injected into air.

I have followed the DPM tutorial, and the "evaporating liquid spray" tutorial but neither really helped me achieve my simple spray.

I am wondering, for this case scenario, would all I need to do from the meshing would be the fluid domain of air that the spray injects into. Can I disregard the nozzle geometry, and its mass_flow_inlet etc, and essentially have no 'inlet' boundary conditions and purely use the injection from the discrete phase model?

Apologies if I missed something, but any tips, advice and help is appreciated. If I missed vital information I can provide more inormation.

Thanks!
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Old   January 20, 2020, 00:26
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Dnyanesh Mirikar
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Yes, you can simulate the spray using a pressure swirl atomizer without using the 'inlet' boundary condition. When you use the default injections you don't need to create a nozzle but you must provide the mass flow rate. Your flow domain should be meshed to simulate the spray. I didn't get any particulars from your question, so hope this helps you.
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Old   June 9, 2021, 03:34
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Vignesh Lakshmanan
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Hi,

Sorry for restarting the thread. I just wanted to know whether flow in nozzles sprays can be always considered compressible/supersonic? Since, it also involves multiphase, it makes the computations much costlier

Regards
Vignesh
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dpm fluent model, fluent 19.2, spray analysis, spray injection, spray model

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