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 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.

A Method Approaching Mirror Boundary Condition in SPH Simulation

2012 ◽  
Vol 516-517 ◽  
pp. 1043-1047
Author(s):  
Feng Jin ◽  
Chao Wan ◽  
Hu Ying Liu
Keyword(s):  
Boundary Condition ◽  
Smoothed Particle Hydrodynamics ◽  
Sph Method ◽  
Virtual Particle ◽  
Particle Hydrodynamics ◽  
Boundary Force ◽  
Smoothed Particle ◽  
Sph Simulation ◽  
Flow Particle ◽  
Good Agreement

A method approaching mirror boundary condition for smoothed particle hydrodynamics (SPH) method is presented. The virtual particle is generated through the nearest boundary particle of the flow particle. The operation is relatively simple and convenient and the applicability to the complexity boundaries can be markedly enhanced. The two dimensional non-linear sloshing is simulated with the new boundary condition. The results are in good agreement with the mirror boundary condition and the boundary force condition dada. It shows that this boundary condition can work well for SPH models.

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