Water pipe flow simulation using improved virtual particles on smoothed particle hydrodynamics

2014 ◽  
Author(s):  
E. S. Ting ◽  
S. H. Yeak
Keyword(s):  
Pipe Flow ◽  
Smoothed Particle Hydrodynamics ◽  
Flow Simulation ◽  
Water Pipe ◽  
Virtual Particles ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

The Comparison of Viscous Force Approximations of Smoothed Particle Hydrodynamics in Poiseuille Flow Simulation

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
Zhengang Liu ◽  
Zhenxia Liu
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Flow Simulation ◽  
Reynolds Numbers ◽  
Viscous Force ◽  
Numerical Instability ◽  
Viscous Stress ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Particle Approximation ◽  
Poiseuille Flows

Poiseuille flows at two Reynolds numbers (Re) 2.5 × 10−2 and 5.0 are simulated by two different smoothed particle hydrodynamics (SPH) schemes on regular and irregular initial particles' distributions. In the first scheme, the viscous stress is calculated directly by the basic SPH particle approximation, while in the second scheme, the viscous stress is calculated by the combination of SPH particle approximation and finite difference method (FDM). The main aims of this paper are (a) investigating the influences of two different schemes on simulations and reducing the numerical instability in simulating Poiseuille flows discovered by other researchers and (b) investigating whether the similar instability exists in other cases and comparing results with the two viscous stress approximations. For Re = 2.5 × 10−2, the simulation with the first scheme becomes instable after the flow approaches to steady-state. However, this instability could be reduced by the second scheme. For Re = 5.0, no instability for two schemes is found.

Progress in Smoothed Particle Hydrodynamics to Simulate Bearing Chambers

2014 ◽  
Author(s):  
A. Ch. H. Kruisbrink ◽  
H. P. Morvan ◽  
F. R. Pearce
Keyword(s):  
Free Surface ◽  
Boundary Conditions ◽  
Smoothed Particle Hydrodynamics ◽  
Flow Simulation ◽  
Two Phase ◽  
Surface And Interface ◽  
Physical Density ◽  
Model Complex ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

In this paper some novel Smoothed Particle Hydrodynamics (SPH) concepts are presented towards a feasibility study into the use of SPH for some aero-engine applications, e.g. for internal oil or fuel applications. A first challenge is to develop a capability to model complex wall geometries, associated with two-phase flows in gear boxes and bearing chambers for example. A demonstration is made of how such complex (for SPH) geometries can be built together with an outline of some of the wall boundary condition concepts used, including moving walls. This is an important feature for the application of SPH to engineering. Other boundary conditions are needed such as inlets, outlets and pressure boundaries, and a proper treatment of the free surface. These are outlined in the context of the proposed application. From an SPH flow simulation viewpoint, one of the challenges is to reduce the non-physical density variations arising from boundary conditions (at wall, free surface and interface), which are responsible for non-physical pressure variations and particle dynamics. The flow regimes found in the engineering systems outlined above involve droplets, filaments and films. It is therefore important to be able to handle the merging of fluids, as it is to model their interaction with another phase, which calls for appropriate multi-fluid and surface tension models. This paper introduces SPH, outlines a number of concepts listed above and presents some preliminary results towards the modeling of the KIT bearing chamber, as described by Kurz et al. [1]. This work builds on a number of numerical modeling communications made by the Nottingham team to SPHERIC, the ERCOFTAC Special Interest Group (SIG) for SPH.

scholarly journals SPH Corrección de la deficienccia de límites para la mejora de condiciones de contornos en superficies deformables

2010 ◽  
Vol 4 (7) ◽  
pp. 21 ◽  
Author(s):  
Van Jones ◽  
Qing Yang ◽  
Leigh McCue-Weil
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Large Deformations ◽  
Momentum Equation ◽  
Repulsive Force ◽  
Virtual Particles ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Cfd Method

Smoothed particle hydrodynamics (SPH) is a meshless, Lagrangian CFD method. SPH often utilizes static virtual particles to correct for integral deficiencies that occur near boundaries. These virtual particles, while useful in most cases, can be difficult to implement for objects which experience large deformations. As an alternative to virtual particles, a repulsive force algorithm is presented which loosely emulates the presence of virtual particles in the SPH momentum equation.

scholarly journals Macroscopic pedestrian flow simulation using Smoothed Particle Hydrodynamics (SPH)

2020 ◽  
Vol 111 ◽  
pp. 334-351 ◽  
Author(s):  
Yufei Yuan ◽  
Bernat Goñi-Ros ◽  
Ha H. Bui ◽  
Winnie Daamen ◽  
Hai L. Vu ◽  
...  
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Flow Simulation ◽  
Pedestrian Flow ◽  
Particle Hydrodynamics ◽  
Smoothed Particle
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