Papers by Keyword: Smoothed Particle Hydrodynamic (SPH)

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Authors: Guo Wei Ma, Xia Wei Yi, Xue Jun Wang
Abstract: A mesh-free smoothed particle hydrodynamics (SPH) method is developed to simulate the failure of heterogeneous materials under different strain rates on 3D compression specimens. An elasto-plastic damage model is adopted to describe the pressure-sensitive strength behavior of the heterogeneous materials. Numerical simulations are performed for the constructed 3D artificial granite specimens. Results demonstrate that the proposed 3D modeling method can better resemble the rock microstructure and heterogeneity and it can be further used in other applications.
Authors: Feng Yan Liu, Le Fang
Abstract: The distortion of particles distribution is a defect that usually leads to numerical instability in the traditional SPH method. In this contribution, we introduce a novel local regrouping method to solve this problem. The basic idea is to keep the particles undeformed by regrouping, dividing or combining the deformed particles. We succeed to simulate the Taylor-Green vortex in 2D with this method, and demonstrate the effectiveness of this method.
Authors: Feng Jin, Chao Wan, Hu Ying Liu
Abstract: 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.
Authors: Quan Yuan, Xin Ye
Abstract: The object of this study is to utilize FE-SPH method to simulate the dynamic behavior of bioprosthetic heart valve during systole. Two kind of bioprosthetic heart valve numerical models are designed based on membrane theory, and they are represented by FE mesh, the blood is modelled as SPH particles. The interaction between the blood and bioprosthetic heart valve is carried out with contact algorithms. Results show that: when the valve leaflets are opening, compared with that of spherical valve, the stress and strain states of cylindrical valve are unstable, and the peak Von Mises is also higher, which high peak stress and its instability may induce the fatigue of valve. The valve opening time of columnar valve leaflets is longer than that of spherical ones, which reduces the blood ejection time. Above results indicate that spherical valve is superior to cylindrical valve. The FE-SPH method is capable of simulating the fluid structure interaction between the bioprosthetic heart valve and blood during the systole.
Authors: Xi Cheng Huang, Yi Xia Yan, Wei Zhou Zhong, Yu Ze Chen, Jian Shi Zhu
Abstract: This paper demonstrates the application of both numerical simulation and empirical equation in predicting the penetration of a concrete target by an ogive-nosed projectile. The results from the experiment performed by Gran and Frew are used as a benchmark for comparison. In the numerical simulations a 3.0-caliber radius-head steel ogival-nose projectile with a mass of 47 kg is fired against cylindrical concrete target with a striking velocity of 315 m/s. In the simulation the smooth particles hydrodynamics SPH-Lagrange coupling method is applied to predict the maximum depth of penetration. For calculation of DoP and response of projectile the SPH-Lagrange method can give satisfactory results.
Authors: Shuai Chen, Le Fang, Bo Qu
Abstract: A model for the deformation of fluid particle under the action of velocity gradient tensor is proposed in this article. In this contribution, the control volume/surface is geometrically simplified into micro-ellipse. By using a series of changes of basis and eigenvalue decomposition, a numerical method for the deformation of an elliptic fluid particle is then demonstrated. Finally, this method is applied in two different problems involving smoothed particle hydrodynamics (SPH) simulation and a passive scalar turbulence case.
Authors: Yan Zhao, Fei Xu, Yu Long Li, Yoshitaka Wada
Abstract: A non-triangulation inserting particle method is presented to prevent numerical fractures of SPH computations. The particles in those regions in which numerical fractures may occur are chosen at the beginning of SPH computations. And, the chosen particles are arrayed by the two different rules respectively according to the particle position relations. When the distance between each two chosen connected particles exceeds a certain value and neither of the corresponding two particles has fractured in SPH computations, a new particle is generated between those two ones and the position relation of particles is updated. The physical quantities that the new particle carries are obtained according to some given rules. The method and the same type of method in the reference are compared. The application of the method is analyzed. Conservation of mass and Conservation of momentum of the whole system are kept in this method. Several examples are given to validate the efficiency of the method to prevent numerical fractures.
Authors: Yong Song Zhan, Xian Jun Chen
Abstract: Particle system is an essential building block for visualize various types of special effects in applications of computer graphics. In this paper, we propose a novel approach based on particle system editor supported by GPU (Graphic Process Units) to provide a WYSIWYG (What You See Is What You Get) editing environment for simplifying special effects development process, where a SPH (Smoothed Particle Hydrodynamics) solver is used for particles movement simulation. Experimental results show the robustness and efficiency of the proposed system for computer games in real time.
Authors: Jia Xiang Guo, Cheng Yang, Jie Han, Xiang Yun Liao, Zhi Yong Yuan
Abstract: We present an improved particle-based coupling method of fluid and rigid bodies which consists of fluid-rigid coupling and rigid-rigid coupling. To simulate both rigid-rigid and fluid-rigid coupling process, we compute the pressure and friction forces between rigid boundary particles and fluid particles. Then we discretize them by SPH method and obtain the resultant forces of rigid bodies and fluid. The main advantage of our method is that it does not rely on the surface normal of rigid bodies and not affected by the sampling density on rigid boundary. Combined with collision pretreatment and space divided neighboring research, our method can simulate the fluid and rigid bodies coupling process efficiently, which possesses high fidelity and strong robustness.
Authors: Raj Das, Paul W. Cleary
Abstract: An approach for three-dimensional modelling of thermo-mechanical responses in an arc welding process is developed using the Smoothed Particle Hydrodynamics (SPH) method. It is demonstrated for a simple arc welding configuration by solving the fully coupled three-dimensional elastoplastic and heat transfer analysis. The temperature distribution of the metal in the weld pool and the surrounding parent material are analysed using SPH, and the resulting residual thermal stresses are evaluated. This work establishes the capability of SPH as a tool for simulating the long-term thermo-mechanical responses, including heat transfer and residual stresses in a welded joint, and gaining insights into post-welding structural behaviour of joints during cooling stages.
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