A numerical study of underwater explosions based on the ghost fluid method. (1st March 2022)

• Record Type: Journal Article
• Authors: Zhao, Zitong; Rong, Jili; Zhang, Shixiong
• Is Part Of: Ocean engineering. Volume 247(2022)
• Publication Date: 2022-03-01
• Subjects: Underwater explosion -- GFM -- Level set technique -- Multi-medium riemann problem -- JWL EOS; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2021.109796
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: In this study, the propagation of shock waves and bubble pulses in the near-field underwater explosions are simulated by the ghost fluid method (GFM). A spherically symmetric model is used to assess the physical model's symmetry. The level set technique is employed to track the moving interface. To solve the multi-medium Riemann problem, the Jones-Wilkins-Lee equation of state (JWL EOS) is used to describe the detonation products and the approximate solution is derived for the multi-medium Riemann solver with source terms. An isobaric fix for the JWL EOS is used to accurately define the real fluid states near the interface. A second-order Harten-Yee TVD method is employed to solve the governing equations' convective parts. Using this model, six TNT explosion experiments are simulated by the real ghost fluid method (RGFM) and modified ghost fluid method (MGFM). The numerical results are compared with the outcomes of the underwater explosions' empirical formulas, AUTODYN software, and the experimental data. The results show that the GFM can accurately simulate the propagation of shock waves and bubble pulses in underwater explosions. Highlights: ● In this study, the propagation of shock waves and bubble pulses in the underwater explosions are simulated by the ghost fluid method (GFM). ● To solve the multi-medium Riemann problem, the Jones-Wilkins-Lee equation of state (JWL EOS) is used to describe the detonation products and the approximate solution is derived for the multi-medium Riemann solver with source terms. ● Using this model, six TNT explosion experiments are simulated by the real ghost fluid method (RGFM) and modified ghost fluid method (MGFM).