Gridfree octree direct simulation Monte Carlo approach for analysis of fractal-like spore aggregates

Revathi Jambunathan, Deborah A. Levin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Octree DSMC is a domain independent methodology used to sort gas particles into nearest neighbors. For very irregular geometries immersed in the domain, the flexibility of the octree method is explored. Modifications made to the numerical approach to compute the volume of irregular octree clusters is presented. The accuracy of the modified octree DSMC is investigated by simulating standard test cases, such as the Fourier flow and micro-poiseuille flow. The octree DSMC simulation results match well with the traditional cartesian grid methods in both the test cases. To further expand its applicability to complex domains, two immersed geometries, a single spherical spore and a fractal-like spore aggregate structure, are first immersed in a 500 K heat bath. This is followed by placing the spores in a Mach 1.92 supersonic flow at 500 K temperature. A heat shielding effect is observed on the inner surface of the fractal spore structure from the heat flux computations. Results confirm that the octree DSMC method is both, accurate and flexible, to model heat transfer on highly irregular geometries embedded in the flow-field.

Original languageEnglish (US)
Title of host publicationAIAA AVIATION 2014 -11th AIAA/ASME Joint Thermophysics and Heat Transfer Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781624102813
StatePublished - Jan 1 2014
Externally publishedYes
EventAIAA AVIATION 2014 -11th AIAA/ASME Joint Thermophysics and Heat Transfer Conference 2014 - Atlanta, GA, United States
Duration: Jun 16 2014Jun 20 2014

Publication series

NameAIAA AVIATION 2014 -11th AIAA/ASME Joint Thermophysics and Heat Transfer Conference

Other

OtherAIAA AVIATION 2014 -11th AIAA/ASME Joint Thermophysics and Heat Transfer Conference 2014
CountryUnited States
CityAtlanta, GA
Period6/16/146/20/14

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering

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    Jambunathan, R., & Levin, D. A. (2014). Gridfree octree direct simulation Monte Carlo approach for analysis of fractal-like spore aggregates. In AIAA AVIATION 2014 -11th AIAA/ASME Joint Thermophysics and Heat Transfer Conference (AIAA AVIATION 2014 -11th AIAA/ASME Joint Thermophysics and Heat Transfer Conference). American Institute of Aeronautics and Astronautics Inc..