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Improvements in MLPG formulation for 3D wave interaction with fixed structures

Agarwal, S., Sriram, V., Yan, S. ORCID: 0000-0001-8968-6616 and Murali, K. (2021). Improvements in MLPG formulation for 3D wave interaction with fixed structures. Computers and Fluids, 218(104826), doi: 10.1016/j.compfluid.2020.104826

Abstract

This paper presents new developments in meshless local Petrov–Galerkin with Rankine source (MLPG_R) particle based method for studying interaction of waves with fixed structures in a numerical wave-tank. A new 3D formulation of the Lagrangian flow problem for incompressible fluid with optimised solution strategy is presented. The pressure Poisson equation is solved in local weak-form with integration done semi-analytically using a new symmetric expression. The wave-generation is done using one-way coupling with a 2D fully-nonlinear potential theory based finite-element model. Further a simple identification method for free-surface particles is proposed, which is shown to work well in vicinity of the structure. The solid-wall boundary condition is treated using ghost and mirror particles for accurate calculation of gradients. The waterline on domain boundary faces is treated using a tangentially moving side-wall approach which makes this particle based scheme capable of capturing small amplitude waves and focusing waves. The paper briefly presents experimental setup used for studying the interaction of a fixed emergent cylinder with uni-directional regular and focusing waves in 3D. The numerical model is validated against results from this experiment. An analysis is conducted on parameters related to local integration domain, wave-making coupling algorithm, particle distribution and time-step. This work highlights the use of hybrid approach for efficient and accurate simulation of waves-structure interaction.

Publication Type: Article
Additional Information: © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher Keywords: Particle-based method, Wave-structure interaction, Hybrid modelling, Free-surface flow, Focused waves
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Civil Engineering
Date Deposited: 20 Jan 2021 15:51
URI: https://openaccess.city.ac.uk/id/eprint/25537
[img] Text - Accepted Version
This document is not freely accessible until 29 December 2021 due to copyright restrictions.
Available under License Creative Commons Attribution Non-commercial No Derivatives.

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