Transient Analysis of Falling Cylinder in Non-Newtonian Fluids: Further Opportunity to Employ the Benefits of SPH Method in Fluid – Structure Problems

2017 ◽  
Vol 12 (1) ◽  
Author(s):  
MohammadMahdi Kamyabi ◽  
S.A. Ramazani Ahmad ◽  
Ata Kamyabi
Keyword(s):  
Slip Boundary Condition ◽  
Fluid Structure Interactions ◽  
Sph Method ◽  
Two Phase ◽  
Fluid Structure ◽  
Slip Boundary ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Free Falling ◽  
Moving Fluid

Abstract: Smoothed particle hydrodynamics (SPH) was applied to simulate the free falling of cylindrical bodies in three types of fluids including Newtonian, generalized-Newtonian and viscoelastic fluids. Renormalized derivation schemes were used because of their consistency in combination with the latest version of no slip boundary condition to improve the handling of moving fluid-structure interactions (FSIs). Verification of the method was performed through comparing the results of some benchmark examples for both single and two phase flows with the literature. The effects of some parameters such as the viscosity of the Newtonian fluid, the n index of the power-law fluid and the relaxation time of the Oldroyd-B fluid along with the diameter of the cylinder on the falling history were investigated. Achieving reasonable results, SPH method was proven to be suitable for simulating moving fluid-structure boundaries independent of the fluid type.

Smoothed Particle Hydrodynamics into the Fluid Dynamics of Classical Problems

2016 ◽  
Vol 846 ◽  
pp. 73-78 ◽  
Author(s):  
Maziar Gholami Korzani ◽  
S. Galindo Torres ◽  
Alexander Scheuermann ◽  
David J. Williams
Keyword(s):  
Fluid Dynamics ◽  
Analytical Solutions ◽  
Poiseuille Flow ◽  
Smoothed Particle Hydrodynamics ◽  
Slip Boundary Condition ◽  
Sph Method ◽  
Slip Boundary ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Computational Fluid Dynamics Cfd

The study concerns the application of the Smoothed Particle Hydrodynamics (SPH) method within the computational fluid dynamics (CFD). In the present study, some classical problems – the Poiseuille flow, the Hagen-Poiseuille flow, and the Couette flow – with the analytical solutions were investigated to verify a newly developed code of SPH. The code used for solving these problems, is an entirely parallel SPH solver in 3D and has been developed by the authors. Fluid was modelled as a viscous liquid with weak compressibility. The boundary walls were simulated with a special set of fixed boundary particles, and no-slip boundary condition was considered. Computational results were compared to available analytical solutions for transient hydraulic processes. Good agreement is achieved for the whole transient stage of the considered problems until steady state is reached. The results of this study highlight the potential of SPH to tackle a broad range of problems in fluid mechanics.

SPH Method for Simulation of Wind-Blown Sand Movements

2011 ◽  
Vol 462-463 ◽  
pp. 1019-1025
Author(s):  
A Fang Jin ◽  
Zhi Chun Yang ◽  
Mamtimin Gheni ◽  
Wen Tao Chen
Keyword(s):  
Mass Density ◽  
Computational Simulation ◽  
Sph Method ◽  
Two Phase ◽  
Self Organized ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Sand Movement ◽  
Observation Method ◽  
Physical Quantities

Wind-Blown sand movement is a complicated, non-linear, self-organized and two-phase flow. Conventional theory of mechanics and existing experimental observation method can’t describe that inherent mechanism exactly, and then appeared much difficulty of numerical method for computational simulation of wind-blown sand movement. In this paper, the smoothed particle hydrodynamics (SPH) method is used for simulating the wind-blown sand movement process. According to the characteristic of wind-blown sand movement the sand grains phase and the gas phase are modeled by considering the different kernel function and the particles size, mass, density, velocity and other physical quantities, which can movement along with controlling equation. Finally the numerical simulations are conducted for wind-blown sand movement and some reasonable results are obtained.

SPH Method with Space-Based Variable Smoothing Length and Its Applications to Free Surface Flow

2018 ◽  
Vol 16 (02) ◽  
pp. 1846002 ◽  
Author(s):  
Wenkui Shi ◽  
Jianqiang Chen ◽  
Yanming Shen ◽  
Yi Jiang
Keyword(s):  
Search Algorithm ◽  
Computational Cost ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Sph Method ◽  
Numerical Accuracy ◽  
Two Phase ◽  
Linked List ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

In order to improve the computational efficiency and spatial resolution of smoothed particle hydrodynamics (SPH) method, a SPH method with space-based variable smoothing length has been developed. In addition, since linked-list search algorithm cannot handle the variable smoothing length problems, an improved linked-list search algorithm and a balanced alternating digital tree (B-ADT) search algorithm have been proposed. The performance of the two improved search algorithms has been evaluated in detail. These methods have been used to simulate two cases of water entry impact and two cases of gas–liquid two-phase flow. The results show that, by using space-based variable smoothing length algorithm, computational cost can be greatly reduced and the numerical accuracy is maintained.

On the SPH Approximations in Modeling Water Waves

2014 ◽  
Vol 60 (1-4) ◽  
pp. 63-86
Author(s):  
Kazimierz Szmidt
Keyword(s):  
Water Waves ◽  
Mirror Reflection ◽  
Sph Method ◽  
Slip Boundary ◽  
Straight Line ◽  
Correction Technique ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Method Accuracy ◽  
Finite Domains

Abstract This paper presents an examination of approximation aspects of the Smoothed Particle Hydrodynamics (SPH) in modeling the water wave phenomenon. Close attention is paid on consistency of the SPH formulation and its relation with a correction technique applied to improve the method accuracy. The considerations are confined to flow fields within finite domains with a free surface and fixed solid boundaries with free slip boundary conditions. In spite of a wide application of the SPH method in fluid mechanics, the appropriate modeling of the boundaries is still not clear. For solid straight line boundaries, a natural way is to use additional (virtual, ghost) particles outside the boundary and take into account mirror reflection of associated field variables. Such a method leads to good results, except for a vicinity of solid horizontal bottoms where, because of the SPH approximations in the description of pressure, a stratification of the fluid material particles may occur. In order to illustrate the last phenomenon, some numerical tests have been made. These numerical experiments show that the solid fluid bottom attracts the material particles and thus, to prevent these particles from penetration into the bottom, a mutual exchange of positions of real and ghost particles has been used in a computation procedure.

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