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Splashing Droplet in Spray-Wall Interaction

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Old   January 21, 2021, 10:45
Default Splashing Droplet in Spray-Wall Interaction
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Hi Community,

I am modeling a spray-wall interaction where the spray hits a flat plate so that I can how many droplets be a wall film, how many are rebounding, and how many are splashing.

In "", there is the variable "rmsplash" (Fraction of parcel mass that is splashed when a parcel undergoes splashing.) and I am confused about it. What does it mean? Does this fraction tell me how much liquid mass remains on the surface as a wall film and how much liquid mass continues moving after splashing?

If so, how come I would need to define it beforehand, is it not depending on the E^2 and E^2_crit how much liquid would remain on the surface?

I would be very happy if someone could help me with this issue.
Thank you very much.
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Old   January 22, 2021, 22:07
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Kislaya Srivastava
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Hello Christoph,

When using the O'Rourke film splash model, CONVERGE uses either the E^2 or Weber(We) number criterion and the Rebound Weber number, specified in, to decide the outcome (rebound or film or splash) of each parcel-wall interaction. If a splash outcome is evaluated, users have the flexibility to specify the fraction of the impinging parcel's mass that will be used to create a new parcel. The rest of the mass will be incorporated into a wall film.

If you, however, have a relationship/equation to calculate splashed mass through the incoming parcel's E^2 or other properties, then you can easily incorporate it into a UDF approach, instead of using our default approach of having a fixed user-specified value for all parcels with a splash outcome.

Please refer to our manual for more details on the above. If you would like assistance with a UDF approach to individually calculate splash mass for each splashed parcel, please reach out to us at Please use your official email for all correspondence with Convergent Science. Please state your request, attach a case setup if possible and mention the cfd-online thread, as reference.

Kislaya Srivastava
Research Engineer | Applications
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Old   January 23, 2021, 04:32
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Hello Kislaya,

Thank you very much for your reply. That's very helpful for me.

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