A study on time evolution method for hyperbolic navier-stokes system

Tsukasa Nagao, Atsushi Hashimoto, Tetsuya Sato

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

The convergence and accuracy of gradient values on high aspect ratio grids remain problems in CFD. One of the methods solving these problems is to use a hyperbolic system. In this study, we investigated time evolution methods for hyperbolic systems and compare the hyperbolic method with a traditional method. We solve the following test cases: one and two dimensional advection-diffusion problems, Navier-Stokes problems such as laminar flow on a flat plate and laminar flow around a cylinder. We confirmed that the convergence in hyperbolic systems was much more rapid and the accuracy of gradient values was higher than that of traditional system. The hyperbolic system takes almost the same time or shorter time than traditional system on same grids. In the case of Navier-Stokes problems such as high Reynolds number boundary flow, on grids achieving the same accuracy, it takes less time in hyperbolic systems than in traditional systems. One of the major findings is that using approximate Jacobian gives the same order accuracy as using exact Jacobian and reduces calculation time remarkably in hyperbolic system. Calculation time was 19% shorter in 1D advection-diffusion problem, 9% in 2D advection-diffusion problem, and more than 74% in Navier-Stokes systems.

本文言語English
ホスト出版物のタイトルAIAA Aerospace Sciences Meeting
出版社American Institute of Aeronautics and Astronautics Inc, AIAA
210059
ISBN(印刷版)9781624105241
DOI
出版ステータスPublished - 2018
イベントAIAA Aerospace Sciences Meeting, 2018 - Kissimmee, United States
継続期間: 2018 1月 82018 1月 12

出版物シリーズ

名前AIAA Aerospace Sciences Meeting, 2018
番号210059

Other

OtherAIAA Aerospace Sciences Meeting, 2018
国/地域United States
CityKissimmee
Period18/1/818/1/12

ASJC Scopus subject areas

  • 航空宇宙工学

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