GPU-BASED FLUID SIMULATION WITH FAST COLLISION DETECTION ON BOUNDARIES

2012 ◽  
Vol 03 (01) ◽  
pp. 1240003 ◽  
Author(s):  
JIAWEN WU ◽  
FENGQUAN ZHANG ◽  
XUKUN SHEN
Keyword(s):  
Collision Detection ◽  
Fluid Simulation ◽  
Sph Method ◽  
Neighbor Search ◽  
Fine Detail ◽  
Simulation Based ◽  
Smoothed Particle ◽  
Sph Simulation ◽  
Smoothed Particle Hydrodynamic ◽  
Fast Collision

In this paper, we present a method for fluid simulation based on smoothed particle hydrodynamic (SPH) with fast collision detection on boundaries on GPU. The major goal of our algorithm is to get a fast SPH simulation and rendering on GPU. Additionally, our algorithm has the following three features: At first, to make the SPH method GPU-friendly, we introduce a spatial hash method for neighbor search. After sorting the particles based on their grid index, neighbor search can be done quickly on GPU. Second, we propose a fast particle-boundary collision detection method. By precomputing the distance field of scene boundaries, collision detection's computing cost arrived as O(n), which is much faster than the traditional way. Third, we propose a pipeline with fine-detail surface reconstruction, and progressive photon mapping working on GPU. We experiment our algorithm on different situations and particle numbers of scenes, and find out that our method gets good results. Our experimental data shows that we can simulate 100K particles, and up to 1000K particles scene at a rate of approximately 2 times per second.

scholarly journals A Novel Improved Coupled Dynamic Solid Boundary Treatment for 2D Fluid Sloshing Simulation

2021 ◽  
Vol 9 (12) ◽  
pp. 1395
Author(s):  
Kaidong Tao ◽  
Xueqian Zhou ◽  
Huiolong Ren
Keyword(s):  
Numerical Dissipation ◽  
Solid Boundary ◽  
Sph Method ◽  
Fluid Sloshing ◽  
Commercial Code ◽  
Boundary Treatment ◽  
Smoothed Particle ◽  
Sph Simulation ◽  
Smoothed Particle Hydrodynamic ◽  
Good Agreement

In order to achieve stable and accurate sloshing simulations with complex geometries using Smoothed Particle Hydrodynamic (SPH) method, a novel improved coupled dynamic solid boundary treatment (SBT) is proposed in this study. Comparing with the previous SBT algorithms, the new SBT algorithm not only can reduce numerical dissipation, but also can greatly improve the ability to prevent fluid particles penetration and to expand the application to model unidirectional deformable boundary. Besides the new SBT algorithm, a number of modified algorithms for correcting density field and position shifting are applied to the new SPH scheme for improving numerical stability and minimizing numerical dissipation in sloshing simulations. Numerical results for three sloshing cases in tanks with different geometries are investigated in this study. In the analysis of the wave elevation and the pressure on the tank, the SPH simulation with the new SBT algorithm shows a good agreement with the experiment and the simulations using the commercial code STAR-CCM+. Especially, the sloshing case in the tank with deformable bottom demonstrates the robustness of the new boundary method.

Numerical Simulation of Wave Breaking Over a Submerged Step with SPH Method

2018 ◽  
Vol 01 (02) ◽  
pp. 1840005 ◽  
Author(s):  
Hongjie Wen ◽  
Bing Ren ◽  
Guoyu Wang ◽  
Yumeng Zhao
Keyword(s):  
Wave Breaking ◽  
Sph Method ◽  
Vertical Distributions ◽  
Sph Model ◽  
Smoothed Particle ◽  
Mean Water Level ◽  
The Mean ◽  
Wave Maker ◽  
Wave Induced ◽  
Smoothed Particle Hydrodynamic

Wave breaking over a submerged step with a steep front slope and a wide horizontal platform is studied by smoothed particle hydrodynamic (SPH) method. By adding a momentum source term and a velocity attenuation term into the governing equation, a nonreflective wave maker system is introduced in the numerical model. A suitable circuit channel is specifically designed for the present SPH model to avoid the nonphysical rise of the mean water level on the horizontal platform of the submerged step. The predicted free surface elevations and the spatial distributions of wave height and wave setup over the submerged step are validated using the corresponding experimental data. In addition, the vertical distributions of wave-induced current over the submerged step are also investigated at both low and high tides.

Smoothed Particles Hydrodynamics Method for Interaction Between Multi-Droplets and Substrate

2006 ◽  
Author(s):  
M. Y. Zhang ◽  
H. Zhang ◽  
L. L. Zheng
Keyword(s):  
Computing Time ◽  
Solidification Process ◽  
Sph Method ◽  
Neighbor Search ◽  
Solidification Interface ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Speed Up ◽  
New Treatment ◽  
2D And 3D

The smoothed particle hydrodynamics (SPH) method, one of meshfree methods, is developed to simulate the interaction between multi-droplets and substrate with solidification. However, the SPH method for this complicated problem needs a large amount of computing time, since it has to use a large number of the SPH particles to represent multidrops and substrate. All-pair search and linked list algorithms are popular in the neighbor search, which is the most time consuming part of the SPH calculation. Both algorithms are tested in this paper. For the solidification process, since the volume of the melt is decreased continuously, a new method is proposed to speed up the SPH calculation. The new treatment is used to handle the particles near the free surface and near the solidification interface Multi-droplets impinging on a smooth substrate in 2D and 3D are simulated to demonstrate the capability of current numerical method on simulating the spreading and solidification of multi-droplets.

scholarly journals Welding Window: Comparison of Deribas’ and Wittman’s Approaches and SPH Simulation Results

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1323 ◽  
Author(s):  
Yulia Yu. Émurlaeva ◽  
Ivan A. Bataev ◽  
Qiang Zhou ◽  
Daria V. Lazurenko ◽  
Ivan V. Ivanov ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
High Velocity ◽  
High Velocity Impact ◽  
Sph Method ◽  
Velocity Impact ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Impact Welding ◽  
Simulation Results ◽  
Sph Simulation

A welding window is one of the key concepts used to select optimal regimes for high-velocity impact welding. In a number of recent studies, the method of smoothed particle hydrodynamics (SPH) was used to find the welding window. In this paper, an attempt is made to compare the results of SPH simulation and classical approaches to find the boundaries of a welding window. The experimental data on the welding of 6061-T6 alloy obtained by Wittman were used to verify the simulation results. Numerical simulation of high-velocity impact accompanied by deformation and heating was carried out by the SPH method in Ansys Autodyn software. To analyze the cooling process, the heat equation was solved using the finite difference method. Numerical simulation reproduced most of the explosion welding phenomena, in particular, the formation of waves, vortices, and jets. The left, right, and lower boundaries found using numerical simulations were in good agreement with those found using Wittman’s and Deribas’s approaches. At the same time, significant differences were found in the position of the upper limit. The results of this study improve understanding of the mechanism of joint formation during high-velocity impact welding.

SPH Simulation of Hydrodynamic Forces on Subsea Pipelines

2011 ◽  
Author(s):  
Kourosh Abdolmaleki
Keyword(s):  
Hydrodynamic Forces ◽  
Forced Oscillations ◽  
Sph Method ◽  
Flat Bottom ◽  
Extreme Load ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Sph Simulation ◽  
Subsea Pipelines ◽  
Supercritical Flows

Hydrodynamic forces on subsea pipelines are simulated using Smoothed Particle Hydrodynamics (SPH) method. The objective is to assess the suitability of this method for common sub-sea engineering problems. The standard SPH formulation is used for simulation of cases with high KC and Re numbers, where the flow becomes turbulent with laminar or partially turbulent boundary layer. The numerical model includes a pipe section with smooth surface resting on a flat bottom. The pipe is exposed to various combinations of regular waves and current. The current is modelled as a steady flow of fluid particles and the waves are represented by forced oscillations of the pipe at defined frequencies and amplitudes. The selected KC and Re numbers produces subcritical and supercritical flows, which simulate extreme load cases on pipelines. In subcritical flows, the estimated forces on the pipeline agree well with experimental data. In supercritical flows with high KC and Re values, a relatively finer particle resolution is required in order to capture multiple harmonics of oscillating lift force. In conclusion, the SPH method could satisfactorily predict hydrodynamic forces on pipelines for the cases investigated.

scholarly journals A Study of Axial Impact of Composite Rods Using SPH Approach

2001 ◽  
Vol 8 (5) ◽  
pp. 303-312 ◽  
Author(s):  
K.Y. Lam ◽  
Y.G. Shen ◽  
S.W. Gong
Keyword(s):  
Theoretical Analysis ◽  
Material Properties ◽  
Computational Simulation ◽  
Present Approach ◽  
Impact Response ◽  
Sph Method ◽  
Axial Impact ◽  
Composite Rod ◽  
Smoothed Particle ◽  
Smoothed Particle Hydrodynamic

A computational simulation of axial impact between composite rods is presented in this paper. The smoothed particle hydrodynamic (SPH) method is coded and implemented for this study, in which the property and strength for different materials are included. The SPH formulation for impact between rods as well as its computatinal procedure is also expounded. The present approach is used to study impact between composites rods parametrically. The effects of material properties and configurations of composite rod on impact response are then examined in detail. In addition, the present SPH results are compared with those from theoretical analysis.

scholarly journals A practical approach for extracting mechanical properties of microcapsules using a hybrid numerical model

2020 ◽  
Vol 25 (1) ◽  
Author(s):  
A. Rahmat ◽  
J. Meng ◽  
D. R. Emerson ◽  
Chuan-Yu Wu ◽  
M. Barigou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Passage Time ◽  
Spring Model ◽  
Sph Method ◽  
Deformation Index ◽  
Quantitative Parameters ◽  
Mass Spring Model ◽  
Smoothed Particle ◽  
Mass Spring ◽  
Smoothed Particle Hydrodynamic

AbstractIn this paper, the deformation of compliant microcapsules is studied in narrow constrictions using a hybrid particle-based model. The model combines the Smoothed Particle Hydrodynamic (SPH) method for modelling fluid flow and the Mass Spring Model (MSM) for simulating deformable membranes. The model is initially validated for the dynamics of microcapsules in shear flow. Then, several quantitative parameters such as the deformation index, frontal tip and rear tail curvatures and the passage time are introduced and their variations are studied with respect to capillary number and constriction size. Subsequently, a dependency analysis is performed on these quantitative parameters and some recommendations are made on fabrication of microfluidic devices and analysis of microcapsules for extracting their mechanical properties. It is revealed that the deformation index and frontal tip and rear tail curvatures are the most suitable parameters for correlating the elastic properties to the dynamics of microcapsules.

scholarly journals Simulation fragmentation of samples of rock at explosive loading

2020 ◽  
Vol 192 ◽  
pp. 01013
Author(s):  
Vitaly Trofimov ◽  
Ivan Shipovskii
Keyword(s):  
Digital Technology ◽  
Rock Properties ◽  
Expansion Velocity ◽  
Processing Plant ◽  
Sph Method ◽  
Simulation Based ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Definition Of ◽  
Holistic Vision

Research to improve the definition of rational parameters for blasting is becoming increasingly important and valuable. This is especially true in the era of digital technology, which allows miners to realize a holistic vision of optimizing the entire process - from the quarry to the receipt of the final product at the processing plant. The proposed computer simulation based on the Smoothed Particle Hydrodynamics (SPH) method in AUTODYN computer complex to optimize the explosion results by integrating the initial data - charge parameters and rock properties, is aimed at improving measures that reduce the total cost of drilling and blasting, increasing mining productivity and safety. The presented calculations make it possible to estimate the number of fragments and their initial expansion velocity for various explosives.

Simulation-based fast collision detection for scaled polyhedral objects in motion by exploiting analytical contact equations

Robotica ◽  
2014 ◽  
Vol 34 (1) ◽  
pp. 118-134
Author(s):  
Jing-Sin Liu ◽  
Wen-Hua Pan ◽  
Wen-Yang Ku ◽  
Y.-H. Tsao ◽  
Y.-Z. Chang
Keyword(s):  
Relative Motion ◽  
Collision Detection ◽  
Detection Method ◽  
Object Motion ◽  
Computational Time ◽  
Scaling Factors ◽  
Tangential Contact ◽  
Simulation Based ◽  
Uniform Scaling ◽  
Fast Collision

SUMMARYBased on the results of the study of convex object motion1 (J. Hopcroft and G. Wilfong, “Motion of objects in contact,” Int. J. Robot. Res., 4(4), 32–46 (1986)), this paper addresses the problem of exact collision detection of a pair of scaled convex polyhedra in relative motion, and determines the contact conditions of tangential contact features, arbitrary relative motion involving translation and rotation, and uniform scaling of the objects about a fixed point. We propose a new concept of the decision curve based on analytical contact equations that characterize a continuum of scaling factors (or a single scaling factor), which ensures that a pair of objects undergoing a scaling transformation will maintain the same tangential contact feature pair (or make instantaneous tangential contact feature transitions). We propose a reliable simulation-based approach to construct the decision curve by hybridizing analytical contact equations and conventional collision detection method, called the Fast Collision Detection Method (FCDM). This method can determine whether two scaled objects will make contact at specific tangential contact features (vertices, edges, or faces) under particular uniform scaling factors and after distinctive relative motion with better accuracy and less computational time than the existing collision detection methods. Finally, we demonstrate our approach for solving motion design in simple assembly/disassembly problems.

An Efficient SPH Approach for Nearly Incompressible Fluid Simulation

2014 ◽  
Vol 543-547 ◽  
pp. 1667-1670
Author(s):  
Zhong Xing Zhang ◽  
Peng Zhe Qiao ◽  
Tao Li ◽  
Tao Xiang
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Previous Method ◽  
Incompressible Fluids ◽  
Fluid Simulation ◽  
Compressible Fluids ◽  
Calculation Methods ◽  
Pressure Force ◽  
Sph Method ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

In this paper, we present an efficient approach based on Smoothed Particle Hydrodynamics (SPH) to simulate nearly incompressible fluids. The proposed method is an extension of the traditional SPH method designed for compressible fluids. We first introduce a new scheme for pressure evaluation to satisfy the incompressibility constraints. Then novel calculation methods for pressure force and viscosity force are discussed. Finally, the results demonstrate that our method is more capable of realistically simulating fluids with near-incompressibility than previous method.

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