Number of drops within parcel lower than 1.

SlurmMckenzie · October 8, 2019, 03:39

Good morning,

As the title says, I am currently simulating a DDM spray injection, and when postprocessing, the "num_drop" array has mostly values lower than 1.

What is the physical meaning of it?

Kind regards

xieshengbai · October 8, 2019, 17:21

Hi, in CONVERGE, the number of droplets per parcel is not necessary to be integer. The parcel is nothing but a collection of droplets with same properties. In theory, it does not make sense to have num_drop < 1, but in practice CONVERGE still tolerates this situation. I think it indicates several possibilities, such as too many parcels or too large of the droplets. Please double check the spray setup and the droplet radius in the results.

October 8, 2019, 03:39	Number of drops within parcel lower than 1.	#1
SlurmMckenzie New Member Javier Join Date: Jan 2018 Posts: 4 Rep Power: 8	Good morning, As the title says, I am currently simulating a DDM spray injection, and when postprocessing, the "num_drop" array has mostly values lower than 1. What is the physical meaning of it? Kind regards

October 8, 2019, 17:21		#2
xieshengbai Member Shengbai Xie Join Date: Aug 2016 Location: Convergent Science, Madison WI Posts: 60 Rep Power: 9	Hi, in CONVERGE, the number of droplets per parcel is not necessary to be integer. The parcel is nothing but a collection of droplets with same properties. In theory, it does not make sense to have num_drop < 1, but in practice CONVERGE still tolerates this situation. I think it indicates several possibilities, such as too many parcels or too large of the droplets. Please double check the spray setup and the droplet radius in the results. __________________ Shengbai Xie, Ph.D. Senior research engineer, Application (608) 230-1563 convergecfd.com

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