scholarly journals A New Solid Boundary Treatment Algorithm For Smoothed Particle Hydrodynamics

2011 ◽  
Author(s):  
M. B. Liu ◽  
J. R. Shao ◽  
Jiachun Li ◽  
Song Fu
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Treatment Algorithm ◽  
Solid Boundary ◽  
Boundary Treatment ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

scholarly journals A MULTI-NODE APPROACH TO SIMULATE THIN COASTAL STRUCTURES IN THE SPH CONTEXT

2017 ◽  
pp. 1
Author(s):  
Francesco Aristodemo ◽  
Domenico Davide Meringolo ◽  
Paolo Veltri
Keyword(s):  
Computational Cost ◽  
Variable Parameter ◽  
The Body ◽  
Solid Particles ◽  
Solid Boundary ◽  
Ghost Particle ◽  
Weakly Compressible ◽  
Boundary Treatment ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

We propose an improvement in modeling solid boundary conditions for 2D weakly-compressible Smoothed Particle Hydrodynamics (SPH) simulations for cases in which the thickness of the body is small compared to the desired particle size and the fluid surrounds the body from more than one side. Specifically, the fixed ghost particles technique developed by Marrone et al. (2011), based on interpolation nodes located within the fluid domain, is here extended to a multi-node approach. The fluid domain is thus divided into various sub-areas and an interpolation node for the considered solid particle is associated to every sub-area. Consequently, the solid particles present an array of values interpolated at different sub-areas for the same physical quantity. When a fluid particle located in a specific region interacts with a multi-node fixed ghost particle, the last assumes the field values interpolated in the reference area through the associated node. The present modeling allows to adopt a coarser spatial resolution to model the same physical problem, resulting in a reduction of the computational cost. The proposed solid boundary treatment is applied to horizontal decks and perforated wall-caisson breakwaters subjected to regular waves. In this context, an automatic hybrid diffusive formulation is introduced in order to prevent shock waves during water impacts and preserve the hydrostatic pressure. The formulation is obtained by defining a variable parameter detecting the occurrence of relevant density gradients induced by fluid impacts, resulting in an automatic switch between the two formulations.

scholarly journals A New Boundary Treatment Method for Smoothed Particle Hydrodynamics

2015 ◽  
Vol 126 ◽  
pp. 655-659
Author(s):  
Shan-Qin Jin ◽  
Xing Zheng ◽  
Wen-Yang Duan ◽  
Kang-Ning Niu
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Treatment Method ◽  
Boundary Treatment ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

scholarly journals THE HYDRODYNAMIC COEFFICIENTS FOR OSCILLATING 2D RECTANGULAR BOX USING WEAKLY COMPRESSIBLE SMOOTHED PARTICLE HYDRODYNAMICS (WCSPH) METHOD

2018 ◽  
Vol 19 (2) ◽  
pp. 172-181
Author(s):  
Muhammad Zahir Ramli
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Experimental Results ◽  
Solid Boundary ◽  
Hydrodynamic Coefficients ◽  
Radiation Problem ◽  
Weakly Compressible ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Hydrodynamics Coefficients ◽  
Wcsph Method

ABSTRACT: An implementation of the weakly compressible smoothed particle hydrodynamics (WCSPH) method is demonstrated to determine the hydrodynamics coefficients through radiation problem of an oscillating 2D rectangular box. Three possible modes of motion namely swaying, heaving, and rolling are carried out to establish the influence of oscillating motions in predicting the added mass and damping. Both solid boundary and fluid flow are modelled by WCSPH and validated by the potential flow and experimental results. Discrepancies observed at lower frequencies are further investigated using different particle resolutions, different time steps, and extending the domain with longer runtime to demonstrate the performance of WCSPH. Finally, flow separation and vortices are discussed and compared with experimental results. ABSTRAK: Bagi fenomena yang melibatkan radiasi dalam air, segiempat kotak 2D diosilasikan dengan menggunakan simulasi WCSPH untuk memperoleh pekali hidrodinamik. Mod osilasi terbahagi kepada 3 iaitu sway, heave dan roll. Osilasi dengan mengguna pakai kotak akan mempengaruhi pergerakan air dalam menentukan nilai penambahan jisim dan rendaman. Keseluruhan domain air dan sempadan telah dimodelkan dengan menggunakan WCSPH. Semua model tersebut kemudiannya akan dibandingkan melalui keputusan eksperimen dan teori. Jika keputusan melalui kaedah WCSPH ini berbeza, terutama pada frekuensi rendah, penyelidikan lanjut akan dilakukan dengan menggunakan zarah resolusi yang berbeza, langkah masa yang berbeza dan menambah masa domain ujikaji bagi menilai keputusan WCSPH. Akhirnya, kriteria aliran dan kadar pusaran yang terhasil di sekeliling kotak akan dibincang dan dibandingkan bersama keputusan eksperimen.

scholarly journals A new repulsive model for solid boundary condition in smoothed particle hydrodynamics

2013 ◽  
Vol 62 (4) ◽  
pp. 044702
Author(s):  
Han Ya-Wei ◽  
Qiang Hong-Fu ◽  
Zhao Jiu-Ling ◽  
Gao Wei-Ran
Keyword(s):  
Boundary Condition ◽  
Smoothed Particle Hydrodynamics ◽  
Solid Boundary ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

scholarly journals Smoothed Particle Hydrodynamics Modeling with Advanced Boundary Conditions for Two-Dimensional Dam-Break Floods

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1142
Author(s):  
Domenica Mirauda ◽  
Raffaele Albano ◽  
Aurelia Sole ◽  
Jan Adamowski
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Numerical Solutions ◽  
Vertical Wall ◽  
Dam Break ◽  
Secondary Wave ◽  
Two Dimensional ◽  
Boundary Treatment ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
The Impact

To simulate the dynamics of two-dimensional dam-break flow on a dry horizontal bed, we use a smoothed particle hydrodynamics model implementing two advanced boundary treatment techniques: (i) a semi-analytical approach, based on the computation of volume integrals within the truncated portions of the kernel supports at boundaries and (ii) an extension of the ghost-particle boundary method for mobile boundaries, adapted to free-slip conditions. The trends of the free surface along the channel, and of the impact wave pressures on the downstream vertical wall, were first validated against an experimental case study and then compared with other numerical solutions. The two boundary treatment schemes accurately predicted the overall shape of the primary wave front advancing along the dry bed until its impact with the downstream vertical wall. Compared to data from numerical models in the literature, the present results showed a closer fit to an experimental secondary wave, reflected by the downstream wall and characterized by complex vortex structures. The results showed the reliability of both the proposed boundary condition schemes in resolving violent wave breaking and impact events of a practical dam-break application, producing smooth pressure fields and accurately predicting pressure and water level peaks.

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