An SPH model for free surface flows with moving rigid objects

Abstract

SUMMARYThis paper presents a computational model for free surface flows interacting with moving rigid bodies. The model is based on the SPH method, which is a popular meshfree, Lagrangian particle method and can naturally treat large flow deformation and moving features without any interface/surface capture or tracking algorithm. Fluid particles are used to model the free surface flows which are governed by Navier-Stokes equations, and solid particles are used to model the dynamic movement (translation and rotation) of moving rigid objects. The interaction of the neighboring fluid and solid particles renders the fluid-solid interaction and the non-slip solid boundary conditions. The SPH method is improved with corrections on the SPH kernel and kernel gradients, enhancement of solid boundary condition, and implementation of Reynoldsaveraged Navier-Stokes turbulence model. Three numerical examples including the water exit of a cylinder, the sinking of a submerged cylinder and the complicated motion of an elliptical cylinder near free surface are provided. The obtained numerical results show good agreement with results from other sources and clearly demonstrate the effectiveness of the presented meshfree particle model in modeling free surface flows with moving objects.

Smoothed Particle Hydrodynamics Simulations of Dam-Break Flows Around Movable Structures

“…It is promising to note that good progress has been made in recently years to understand the fundamentals of this phenomenon, as reported in Liang et al (2010), Chen et al (2013) and Liu et al (2014). More practical scenarios have been considered by Wu et al (2013), using a GPUbased WCSPH model to simulate dam-break flooding in urban areas.…”

“…Some studies even consider multi-degrees of the freedom, as documented by Bouscasse et al (2013), Liu et al (2014), Amicarelli et al (2015), Ren et al (2015) and Canelas et al (2015).…”

Two-phase SPH simulation of fluid–structure interactions

“…In recent years, the mesh-free Smoothed Particle Hydrodynamics (referred as SPH) method becomes quite attractive in simulating the violent deformation of free surface and the wave breaking. As a result, a variety of fluid-structure interaction problems have been investigated by using either SPH (Gao et al, 2012;Liu et al, 2014;Ren et al, 2014) or other similar mesh-free particle models (Koshizuka et al, 1998;Hwang et al, 2014). SPH was originally developed for the astrophysical computations by Gingold and Monaghan (1977) and later modified to model the fluid flows by Monaghan (1994).…”

“…Therefore, the continuity and momentum conservation equations are formulated as a set of ordinary differential equations, and the SPH particle positions and attributes are computed by using the standard numerical integration methods in the time domain. With regard to the water entry problem, there exist quite a few good SPH works including Vandamme et al (2011), Skillen et al (2013) and Liu et al (2014). It has been found that the SPH method is quite promising in simulating these kinds of transient impact problems and very refined flow features can be captured by the mesh-free particle motion.…”

2D Numerical ISPH Wave Tank for Complex Fluid–Structure Coupling Problems

“…A variable mass approach has also been used by Omidvar et al (2012) for the study of more practical wave-solid interactions, as the computational efficiency was greatly improved due to the adoption of non-uniform particle configurations. The latest fluid-structure interaction work was reported by Liu et al (2014a), in which more advanced kernel corrections and solid boundaries were used to improve the numerical performance. In the incompressible SPH (e.g.…”