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Droplet break up at wire grid - multiphase model selection

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Old   May 25, 2021, 07:36
Question Droplet break up at wire grid - multiphase model selection
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I would like to simulate (star-ccm+, fvm) a water jet (in the next step replaced by a pressurised swirl) flow at I fine wire mesh. The diameter of the jet is 1 mm and the wires thickness 0.3 mm. I suppose to get small daughter droplets with a size about 0.001 mm. The jet is located inside a channel with an air counterflow. I am investigating the influence of the ambient airflow on the water droplets, their droplets distribution, etc.

The problem I am facing is the fine resolution and simulation time. I use Volume of Fluid to capture the interaction between both phases and with the grid (surface tension) and the simulation domain involving a symmetry boundaries reduction but still three dimensional domain has over 10 mil. cells which is too much and not fine enough. I would like to have the results in near future not waiting so long.

My question is if there are any aproppriate models, less time consuming which are able to simulate this problem correctly. I heard about Langragian multiphase models but I am not sure if they perform the droplet breakups and breakup at the grid. But I am not interested in the air flow so I guess the Langragian approch could be relevant in this case?

Thanks for any advice
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atomisation, break up, volume of fluid

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