Numerical Simulation of Water-Entry and Sedimentation of an Elliptic Cylinder Using Smoothed-Particle Hydrodynamics Method

Abstract

This paper studies the two-dimensional water-entry and sedimentation of an elliptic cyl inder using the subparticle scale (SPS) turbulence model of a Lagrangian particle-based smoothed-particle hydrodynamics (SPH) method. The motion of the body is driven by the hydrodynamic forces and the gravity. The present study shows the ability of the SPH method for the simulation of free-surface-involving and multiphase flow problems. The full Navier-Stokes equation, along with the continuity equation, have been solved as the governing equations of the problem. The accuracy of the numerical code is verified using the case o f the water-entry and exit of a circular cylinder. The numerical simulations of the water-entry and sedimentation of the vertical and horizontal elliptic cylinder with the diameter ratio o f 0.75 are performed at the Froude numbers ofO, 2,5, and 8, and the spe cific gravities of 0.5, 0.75,1,1.5,1.75, 2, and 2.5. The effect of the governing parameters and vortex shedding behind the elliptic cylinder on the trajectory curves, velocity compo nents within the flow field, rotation angle, the velocity of ellipse, and the deformation of free-surf ace have been investigated in detail, [

Electrohydrodynamics of a droplet in a highly confined domain: A numerical study

“…SPH is a mesh-free Lagrangian particle-based method, which was initially developed by Gingold and Monaghan 31 for astrophysical problems. However, it had been used for simulating a broad range of physical problems including free surface, [32][33][34] turbulent, 35,36 multi-phase, 15,37,38 heat transfer, 39,40 and biological problems. 41,42 In this section, the SPH method is described in more detail, which is used in our simulation.…”

Development of smoothed particle hydrodynamics method for modeling active nematics

“…Many challenging fluid and solid mechanics related problems have been successfully handled with the SPH methods, which for instance include free surface flows, [18][19][20] nano- 21 and bio-heat transfer, 22 multi-phase flow, 23 electrohydrodynamics (EHD), [24][25][26] among others. However, to the best of our knowledge, an attempt for simulating active nematics with the SPH method has not been realized to date.…”

Turbulent fluid-structure interaction of water-entry/exit of a rotating circular cylinder using SPH method

“…Saghatchi et al 21,22 used the SPH method to simulate the water-entry and sedimentation of an elliptic cylinder. The SPH method is employed to perform the simulation of°uid-structure interaction of°ow over a water-leaving rotating circular cylinder.…”