Fluid Structure Interaction of 2D Objects through a Coupled KBC-Free Surface Model

Daniele Chiappini

doi:10.3390/w12041212

Abstract

In this study, the capabilities of a coupled KBC-free surface model to deal with fluid solid interactions with the slamming of rigid obstacles in a calm water tank were analyzed. The results were firstly validated with experimental and numerical data available in literature and, thereafter, some additional analyses was carried out to understand the main parameters’ influence on slamming coefficient. The effect of grid resolution and Reynolds number were firstly considered to choose the proper grid and to present the weak impact of such a non-dimensional number on process evolution. Hence, the influence of Froude number on fluid-dynamics quantities was pointed out considering vertical impacts of both cylindrical, as in the references, and ellipsoidal obstacles. Different formulations of slamming coefficient were used and compared. Results are pretty encouraging and they confirm the effectiveness of lattice Boltzmann model to deal with such a problem. This leaves the door open to additional improvements addressed to the study of free buoyant bodies immersed in a fluid domain.

Highlights

Always increasing attention has been addressed to the analysis of fluid structure interaction (FSI) between solid and fluid in relative motion
With respect to lattice Boltzmann method (LBM), many studies have already been carried out considering both rigid and flexible obstacles interacting with fluid flows [22]
The results were first validated with experimental results already present in the literature and with a BGK-Smagonrinsky approach, highlighting appreciable results in terms of slamming coefficient in the range of moderate Reynolds number

Summary

Introduction

Always increasing attention has been addressed to the analysis of fluid structure interaction (FSI) between solid and fluid in relative motion Such a problem is ubiquitous and present in a large number of engineering applications, which span from naval [1,2,3], to energy harvesting [4] and from to bio-engineering [4] to micro-mechanical problems [5]. All these numerical models have been constantly compared and validated with the large number of experimental data available in literature, which, again, cover a wide range of applications [4,15,16,17,18] It is worth highlighting how, in the recent past, due to the increased computational power availability, many efforts have been devoted in defining models for the contemporary solution of both fluid and solid motion/deformation [19]. Some authors have deeply analyzed the FSI problems dealt with LBM: De Rosis et al

Objectives

Results

Conclusion