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37 pages, 12873 KB

Open AccessArticle

A WCSPH Particle Shifting Strategy for Simulating Violent Free Surface Flows

by Abdelkader Krimi, Mojtaba Jandaghian and Ahmad Shakibaeinia

Water 2020, 12(11), 3189; https://doi.org/10.3390/w12113189 - 14 Nov 2020

Cited by 25 | Viewed by 5192

In this work, we develop an enhanced particle shifting strategy in the framework of weakly compressible

δ^{+}

-SPH method. This technique can be considered as an extension of the so-called improved particle shifting technology (IPST) proposed by Wang et al. (2019). We [...] Read more.

In this work, we develop an enhanced particle shifting strategy in the framework of weakly compressible

δ^{+}

-SPH method. This technique can be considered as an extension of the so-called improved particle shifting technology (IPST) proposed by Wang et al. (2019). We introduce a new parameter named

“ ϕ ”

to the particle shifting formulation, on the one hand to reduce the effect of truncated kernel support on the formulation near the free surface region, on the other hand, to deal with the problem of poor estimation of free surface particles. We define a simple criterion based on the estimation of particle concentration to limit the error’s accumulation in time caused by the shifting in order to achieve a long time violent free surface flows simulation. We propose also an efficient and simple concept for free surface particles detection. A validation of accuracy, stability and consistency of the presented model was shown via several challenging benchmarks. Full article

(This article belongs to the Special Issue Meshless Methods for Water Dynamics and Complex Flows)

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24 pages, 7103 KB

Open AccessArticle

Improved δ-SPH Scheme with Automatic and Adaptive Numerical Dissipation

by Abdelkader Krimi, Luis Ramírez, Sofiane Khelladi, Fermín Navarrina, Michael Deligant and Xesús Nogueira

Water 2020, 12(10), 2858; https://doi.org/10.3390/w12102858 - 14 Oct 2020

Cited by 13 | Viewed by 4237

Abstract

In this work we present a

δ

In this work we present a

δ

-Smoothed Particle Hydrodynamics (SPH) scheme for weakly compressible flows with automatic adaptive numerical dissipation. The resulting scheme is a meshless self-adaptive method, in which the introduced artificial dissipation is designed to increase the dissipation in zones where the flow is under-resolved by the numerical scheme, and to decrease it where dissipation is not required. The accuracy and robustness of the proposed methodology is tested by solving several numerical examples. Using the proposed scheme, we are able to recover the theoretical decay of kinetic energy, even where the flow is under-resolved in very coarse particle discretizations. Moreover, compared with the original

δ

-SPH scheme, the proposed method reduces the number of problem-dependent parameters. Full article

(This article belongs to the Special Issue Computational Fluid Mechanics and Hydraulics)

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15 pages, 7844 KB

Open AccessArticle

Investigation of the Sloshing Behavior Due to Seismic Excitations Considering Two-Way Coupling of the Fluid and the Structure

by A. Ersin Dinçer

Water 2019, 11(12), 2664; https://doi.org/10.3390/w11122664 - 17 Dec 2019

Cited by 21 | Viewed by 6270

Abstract

Sloshing behavior due to near-fault type and earthquake excitations of a fluid in a tank having a highly deformable elastic structure in the middle was investigated experimentally and numerically in this paper. In the numerical model, fluid was simulated with smoothed particle hydrodynamics (SPH) and structure was simulated with the finite element method (FEM). The coupling was satisfied with contact mechanics. The δ-SPH scheme was adapted to lower the numerical oscillations. The proposed fluid-structure interaction (FSI) method can simulate the violent fluid-structure interaction problem successfully. The effects of near-fault type and earthquake excitations on free-surfaces of fluid and the elastic structure are presented. Full article

(This article belongs to the Section Hydraulics and Hydrodynamics)

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