Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session A09: Computational Fluid Dynamics Methods for Multiphase Flows I
8:00 AM–9:57 AM,
Sunday, November 18, 2018
Georgia World Congress Center
Room: B214
Chair: Sivaramakrishnan Balachandar, University of Florida
Abstract ID: BAPS.2018.DFD.A09.3
Abstract: A09.00003 : Discontinuous Galerkin simulation of rarefied dusty gas flows based on a second-order Boltzmann continuum model*
8:26 AM–8:39 AM
Presenter:
Rho Shin Myong
(Gyeongsang Natl Univ)
Authors:
Rho Shin Myong
(Gyeongsang Natl Univ)
Omid Ejtehadi
(Gyeongsang Natl Univ)
Amin Rahimi
(Gyeongsang Natl Univ)
The rocket plume impingement on the lunar surface can cause significant dust dispersal when the lunar lander approaches the landing site. In this work, we aim to study the rocket plume-lunar surface interaction and subsequent regolith particle dispersal within the Eulerian framework. The subjects are challenging due to the facts that, first, the conventional NSF equations may not be valid in rarefied dusty gas flows; second, the flow physics becomes inherently multi-physics, multi-scale problem in which the erosion of regolith, the interaction of gas and solid particle, and the dispersal of dust are coupled; and lastly, it is impossible to reproduce the lunar condition—characterized by micro-gravity, near-vacuum, and unique properties of the regolith—for an experimental test on the earth. Here, using a modal explicit discontinuous Galerkin method of a second-order Boltzmann continuum model that can cover both the continuum and free-molecular flows with a single framework, inherent complexities consisting of various flow regimes—the plume expanding in vacuum, shock and stagnation regions, local erosion, supersonic dusty jet flow, rarefied flow—are investigated in detail.
*This work was supported by the National Research Foundation of South Korea (NRF 2017-R1A2B2-007634).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.A09.3
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