eprintid: 10185580 rev_number: 8 eprint_status: archive userid: 699 dir: disk0/10/18/55/80 datestamp: 2024-01-16 17:27:24 lastmod: 2024-11-01 16:33:54 status_changed: 2024-01-16 17:27:24 type: article metadata_visibility: show sword_depositor: 699 creators_name: Martelo Lopez, S creators_name: Christou, A creators_name: Pan, S creators_name: Stoesser, T creators_name: Xie, Z title: A new ghost-cell/level-set method for three-dimensional flows ispublished: pub divisions: UCL divisions: B04 divisions: C05 divisions: F44 keywords: Ghost-cell method, Two-phase flow, LES, Cartesian grid, Level-set method note: Copyright © 2023 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). abstract: This study presents the implementation of a tailored ghost cell method in Hydro3D, an open-source large eddy simulation (LES) code for computational fluid dynamics based on the finite difference method. The former model for studying the interaction between an immersed object and the fluid flow is the immersed boundary method (IBM) which has been validated for a wide range of Reynolds number flows. However, it is challenging to ensure no-slip and zero gradient boundary conditions on the surface of an immersed body. In order to deal with this, a new sharp-interface ghost-cell method (GCM) is developed for Hydro3D. The code also employs a level-set method to capture the motion of the air-water interface and solves the spatially filtered Navier-Stokes equations in a Cartesian staggered grid with the fractional step method. Both the new GCM and IBM are compared in a single numerical framework. They are applied to simulate benchmark cases in order to validate the numerical results, which mainly comprise single-phase flow over infinite circular and square cylinders for low- and high-Reynolds number flows along with two-phase dam-break flows with a vertical cylinder, in which a good agreement is obtained with other numerical studies and laboratory experiments. date: 2024-02-15 date_type: published publisher: Elsevier BV official_url: https://doi.org/10.1016/j.jcp.2023.112710 oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 2139771 doi: 10.1016/j.jcp.2023.112710 lyricists_name: Stoesser, Thorsten lyricists_id: TSTOE28 actors_name: Kalinowski, Damian actors_id: DKALI47 actors_role: owner full_text_status: public publication: Journal of Computational Physics volume: 499 article_number: 112710 issn: 0021-9991 citation: Martelo Lopez, S; Christou, A; Pan, S; Stoesser, T; Xie, Z; (2024) A new ghost-cell/level-set method for three-dimensional flows. Journal of Computational Physics , 499 , Article 112710. 10.1016/j.jcp.2023.112710 <https://doi.org/10.1016/j.jcp.2023.112710>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/10185580/1/Stoesser_A%20new%20ghost-cell%20level-set%20method%20for%20three%20dimensional%20flows_VoR.pdf