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- W3206094439 abstract "Considering turbulent clouds containing small heavy particles, we investigate the reverse effect of particle collision, in particular collision-&-coagulation, on particle clustering and relative motion. We perform various cases of direct numerical simulation (DNS) of coagulating particles in isotropic turbulent flow and find that, due to collision-coagulation, the radial distribution functions (RDF) fall-off dramatically at scales $r sim d,,$ (where $d$ is the particle diameter) to small but finite values; while the mean radial-component of particle relative velocities (MRV) increase sharply in magnitudes. Based on a previously proposed Fokker-Planck (drift-diffusion) framework, we derive a theoretical account of the relationship among particle collision-coagulation rate, RDF and MRV. The theory includes contribution from turbulent-fluctuations absent in earlier mean-field theories. We show numerically that the theory accurately account for the DNS results. We also proposed a phenomenological model for the MRV which is accurate when calibrated using 4th moments of the fluid velocities. We uncover a paradox: the unjustified accuracy of the differential version of the theory. Our result demonstrate strong coupling between RDF and MRV and implies that earlier isolated studies on either RDF or MRV have limited relevance for predicting particle collision rate." @default.
- W3206094439 created "2021-10-25" @default.
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- W3206094439 date "2021-10-18" @default.
- W3206094439 modified "2023-09-23" @default.
- W3206094439 title "Nontrivial Relations Among Particle Collision, Relative Motion and Clustering in Turbulent Clouds: Computational Observation and Theory." @default.
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