A Cartesian Cut Cell Method for Rarefied Flow Simulations around Moving Obstacles

For accurate simulations of rarefied gas flows around moving obstacles, we propose a cut cell method on Cartesian grids: it allows exact conservation and accurate treatment of boundary conditions. Our approach is designed to treat Cartesian cells and various kind of cut cells by the same algorithm,...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2015-03
Main Authors: Dechristé, Guillaume, Mieussens, Luc
Format: Article
Language:English
Subjects:
Algorithms
Boundary conditions
Cartesian coordinates
Computer simulation
Finite element method
Grid refinement (mathematics)
Moving obstacles
Rarefied gases
Simulation
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:For accurate simulations of rarefied gas flows around moving obstacles, we propose a cut cell method on Cartesian grids: it allows exact conservation and accurate treatment of boundary conditions. Our approach is designed to treat Cartesian cells and various kind of cut cells by the same algorithm, with no need to identify the specific shape of each cut cell. This makes the implementation quite simple, and allows a direct extension to 3D problems. Such simulations are also made possible by using an adaptive mesh refinement technique and a hybrid parallel implementation. This is illustrated by several test cases, including a 3D unsteady simulation of the Crookes radiometer.
ISSN:2331-8422
DOI:10.48550/arxiv.1503.04544