Verification and validation in highly viscous fluid simulation using a fully implicit SPH method

Daniel S. Morikawa, Mitsuteru Asai, Masaharu Isshiki

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

Catastrophes involving mass movements has always been a great threat to civilizations. We propse to simplify the behavior of the mass movement material as a highly viscous fluid, possibly non-Newtonian. In this context, this study describes the application of two improvements in highly viscous fluid simulations using the smoothed particle hydrodynamics (SPH) method: an implicit time integration scheme to overcome the problem of impractically small time-step restriction, and the introduction of air ghost particles to fix problems regarding the free-surface treatment. The application of a fully implicit time integration method implies an adaptation of the wall boundary condition, which is also covered in this study. Furthermore, the proposed wall boundary condition allows for different slip conditions, which is usually difficult to adopt in SPH. To solve a persistent problem on the SPH method of unstable pressure distributions, we adopted the incompressible SPH [1] as a basis for the implementation of these improvements, which guarantees stable and accurate pressure distribution. We conducted non-Newtonian pipe flow simulations to verify the method and a variety of dam break and wave generated by underwater landslide simulations for validation. Finally, we demonstrate the potential of this method with the highly viscous vertical jet flow over a horizontal plate test, which features a complex viscous coiling behavior.

本文言語英語
ホスト出版物のタイトル6th International Conference on Particle-Based Methods. Fundamentals and Applications, PARTICLES 2019
編集者Eugenio Onate, P. Wriggers, T. Zohdi, M. Bischoff, D.R.J. Owen
出版社International Center for Numerical Methods in Engineering
ページ103-114
ページ数12
ISBN(電子版)9788412110111
出版ステータス出版済み - 2019
イベント6th International Conference on Particle-Based Methods. Fundamentals and Applications, PARTICLES 2019 - Barcelona, スペイン
継続期間: 10 28 201910 30 2019

出版物シリーズ

名前6th International Conference on Particle-Based Methods. Fundamentals and Applications, PARTICLES 2019

会議

会議6th International Conference on Particle-Based Methods. Fundamentals and Applications, PARTICLES 2019
国/地域スペイン
CityBarcelona
Period10/28/1910/30/19

All Science Journal Classification (ASJC) codes

  • 凝縮系物理学
  • 原子分子物理学および光学

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