A new particle method for simulation of incompressible free surface flow problems

Koh, C. G.; Gao, Minmin; Luo, Chunling

doi:10.1002/nme.3303

Cited by 89 publications

(101 citation statements)

References 63 publications

(98 reference statements)

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“…A simplified version of the method used by Koh et al [26] is adopted. If the "circle" is completely covered by its neighbours, then it is recognized as an inner fluid particle, otherwise it is a free surface particle.…”

Section: D) Free Surface Identificationmentioning

confidence: 99%

“…For example, the current distance between two particles are not very small (which will not activate the particle shifting scheme), but they have large relative velocities which mean they will get very close after prediction step. As a consequence, similar to [26], a simple collision handling technique is applied here. The basic idea of this approach is that the relative velocities between particles are set to be zero when they are forecasted to be closer than the threshold before the prediction step.…”

Section: Particle Shifting and Collision Handlingmentioning

confidence: 99%

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Modified MPS method for the 2D fluid structure interaction problem with free surface

et al. 2015

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Please cite this article as: Zhe Sun , K. Djidjeli , Jing T. Xing , Fai cheng , Modified mps method for the 2d fluid structure interaction problem with free surface, Computers and Fluids (2015), doi: 10.1016/j.compfluid.2015 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Section: D) Free Surface Identificationmentioning

confidence: 99%

Section: Particle Shifting and Collision Handlingmentioning

confidence: 99%

Modified MPS method for the 2D fluid structure interaction problem with free surface

et al. 2015

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“…(3.2)-(3.5)) are of second-order. a) Free surface particle identification A simplified version of the method used by Koh et al (Koh et al, 2012) is adopted. If the "circle" is completely covered by its neighbors, then it is recognized as an inner fluid particle, otherwise it is a free surface particle.…”

Section: Boundary Conditions For Poisson Equation A) Pressure Neumannmentioning

confidence: 99%

Coupled MPS-modal superposition method for 2D nonlinear fluid-structure interaction problems with free surface

Sun

Djidjeli

Xing

et al. 2016

Journal of Fluids and Structures

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Keywords:Moving particle semi-implicit (MPS) method Fluid structure interaction (FSI) Modal superposition Free surface flow Floating beam Flexible wedge dropping a b s t r a c tIn this paper, a coupled MPS-modal superposition method is developed for 2D nonlinear fluid-structure interaction problems. In this method, the rigid-body and relatively small elastic deformation are coupled together, which considers the mutual effect between them. The elastic deformation of the structure is represented by a mode superposition formulation, which is more efficient compared with FEM, regardless of the size of the structure. For 2D cases, if the first three modes are chosen to represent the flexible deformation of the structure, it only results in a 6 Â 6 matrix equation to be solved. For the fluid motion, the modified Moving Particle Semi-implicit (MPS) method, which significantly reduces the fluctuation of pressure calculation of the original MPS method, is used.Two nonlinear problems, i.e. breaking-water-dam impacting a floating beam and flexible wedge slamming into the water are simulated to demonstrate the performance of the developed method. The numerical simulations show that this coupling model is capable of providing stable results that are generally in good agreement with the available experimental data. For the highly nonlinear case with very large rigid motions, the mutual effect between elastic deformation and rigid motions could accumulate to a relatively remarkable level shown by the curves of trajectories or acceleration history of the body mass centre. This also indicates the importance of mutual effect to analyse highly nonlinear FSI problems with large rigid-body motions and relatively small flexible deformation.

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“…The time step Δ t at step k + 1 has to satisfy the Courant condition as

normalΔt \leq 0.2 \frac{L_{0}}{v_{\max}},

where

v_{\max}

the maximum particle velocity at step k .…”

Section: Governing Equationmentioning

confidence: 99%

A particle method for two‐phase flows with large density difference

Luo

Koh

Gao

et al. 2015

Numerical Meth Engineering

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SummaryA new numerical approach for solving incompressible two‐phase flows is presented in the framework of the recently developed Consistent Particle Method (CPM). In the context of the Lagrangian particle formulation, the CPM computes spatial derivatives based on the generalized finite difference scheme and produces good results for single‐phase flow problems. Nevertheless, for two‐phase flows, the method cannot be directly applied near the fluid interface because of the abrupt discontinuity of fluid density resulting in large change in pressure gradient. This problem is resolved by dealing with the pressure gradient normalized by density, leading to a two‐phase CPM of which the original singlephase CPM is a special case. In addition, a new adaptive particle selection scheme is proposed to overcome the problem of ill‐conditioned coefficient matrix of pressure Poisson equation when particles are sparse and non‐uniformly spaced. Numerical examples of Rayleigh–Taylor instability, gravity current flow, water‐air sloshing and dam break are presented to demonstrate the accuracy of the proposed method in wave profile and pressure solution. Copyright © 2015 John Wiley & Sons, Ltd.

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A new particle method for simulation of incompressible free surface flow problems

Cited by 89 publications

References 63 publications

Modified MPS method for the 2D fluid structure interaction problem with free surface

Modified MPS method for the 2D fluid structure interaction problem with free surface

Coupled MPS-modal superposition method for 2D nonlinear fluid-structure interaction problems with free surface

A particle method for two‐phase flows with large density difference

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