Retrieval of collision kernels from the change of droplet size distributions with linear inversion

Ryo Onishi*, Keigo Matsuda, Keiko Takahashi, Ryoichi Kurose, Satoru Komori

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


We have developed a new simple inversion scheme for retrieving collision kernels from the change of droplet size distribution due to collision growth. Three-dimensional direct numerical simulations (DNS) of steady isotropic turbulence with colliding droplets are carried out in order to investigate the validity of the developed inversion scheme. In the DNS, air turbulence is calculated using a quasi-spectral method; droplet motions are tracked in a Lagrangian manner. The initial droplet size distribution is set to be equivalent to that obtained in a wind tunnel experiment. Collision kernels retrieved by the developed inversion scheme are compared to those obtained by the DNS. The comparison shows that the collision kernels can be retrieved within 15% error. This verifies the feasibility of retrieving collision kernels using the present inversion scheme.

Original languageEnglish
Article number014050
JournalPhysica Scripta T
Publication statusPublished - 2008
Externally publishedYes
EventInternational Conference 'Turbulent Mixing and Beyond' - Trieste, Italy
Duration: 2007 Aug 182007 Aug 26

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics
  • Condensed Matter Physics
  • Physics and Astronomy(all)


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