A Meshless Solution Method for Unsteady Flow with Moving Boundary

Zhang, Jun; Ren, Dengfeng; Ma, Xianghong; Tan, Junjie; Cai, Xiaowei

doi:10.1155/2014/209575

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…29 Recently, another attractive alternative is the meshless method, which discretizes the incompressible flow governing equations by making use of point clouds. 30,31 Without relying on stencils, elements, or control volumes, meshless methods also do not require mesh generation. This not only simplifies the costly and time consuming process but also avoids various topological and connectivity problems.…”

Section: Resultsmentioning

confidence: 99%

Influence of geometrical characteristics of sidewall-type multiple aneurysms on hemodynamic factors

Hua

Kim

2015

Advances in Mechanical Engineering

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Multiple aneurysms occur rarely and have not been well investigated. The purpose of this study is to verify whether high rupture risk of multiple aneurysms is due to the interaction between multiple aneurysms' geometrical characteristics. The following geometrical characteristics were varied in an idealized sidewall-type model: aneurysm a 1 's dome-neck length (S), size ratio, inflow angle (a), distance between two aneurysms (D), and the parent vessel's angle (u). We varied the parent blood vessel and aneurysm sac a 1 's geometrical characteristics to analyze their hemodynamic influence on aneurysm a 2 . By comparing the influence on aneurysm a 2 , we found that parent blood vessel geometrical characteristics such as the distance between aneurysms (D) and the parent vessel's angle (u) were the most hemodynamically influential characteristics examined. The impact of varying the aneurysm's geometrical characteristics such as dome-neck length (S), size ratio, and inflow angle (a) was not obvious. The reason for the higher rupture rate of multiple aneurysms is not due to interactions between the aneurysm sacs but due to factors of each individual aneurysm.

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Section: Resultsmentioning

confidence: 99%

Influence of geometrical characteristics of sidewall-type multiple aneurysms on hemodynamic factors

Hua

Kim

2015

Advances in Mechanical Engineering

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“…They are relatively stationary and store the characteristic information of local fluid flow. 36 Set of background discrete points is generated and remains fixed while the solid bodies are moving. Their topology doesn't change during the numerical iteration.…”

Section: Overlapping Point Cloud Methodsmentioning

confidence: 99%

Numerical study of the switching mechanism of a jet valve using the meshless method

Zhang

Wang²,

Tan

et al. 2021

Advances in Mechanical Engineering

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This study numerically investigates fluid dynamics of a jet flow at supersonic speed. The meshless method and the overlapping point cloud method are used to handle the moving boundary problems. The interaction between the jet flow and a moving ball-shaped plug is numerically solved, which has been rarely done in the published literature. The switching mechanism of a novel designed jet valve in an attitude and orbit control system (AOCS) is analyzed. It is found out that applied pressure to the control inlets of the jet valve must be high enough in order to successfully drive the plug to move and subsequently change the force direction acting on the jet valve. Then the switching mechanism of AOCS can be triggered. The initial fluid condition also plays a vital role and it significantly influences the response time of the switch. This study explores the underlying physics of the jet flow on its deflection, wall attachment, and interaction with the ball-shaped plug. It contributes to the optimization design of the jet valve in the AOCS with a fast and efficient response.

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“…For conditions with small rigid boundary displacement and little changes in existing point cloud structure, commonlyused methods include algebraic analogy model, Delaunay graph mapping method [39] , and spring analogy method [40], etc. As for movements with larger rigid boundary displacement, the commonly adopted methods include the point cloud overlapping method [41,42] , and the local point cloud reconstruction method [13], etc. The local point cloud reconstruction method is suitable for dealing with the unsteady flow problems with complicated boundary deformation; its idea is quite simple: delete the point cloud whose quality deteriorated due to the boundary deformation from the original point cloud topological structure and form a cavity, then use the automatic point cloud generation method to re-generate a high-quality point cloud in the cavity, and add it to the original point cloud system to continue the calculation.…”

Section: Introductionmentioning

confidence: 99%

Application of Three-Dimensional Meshless Method in Muzzle Flow Field of Projectile with Large Displacement

Wang¹,

Xue²,

Cai³

et al. 2021

IJHT

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The mesh-less method abandons the idea of traditional mesh method. In numerical calculation, it only needs the node information, and it's not necessary to connect nodes into mesh cells. Aiming at the problem of non-equilibrium chemical reaction flows in a threedimensional muzzle with moving boundaries, this paper proposed a three-dimensional least squares mesh-less (3D-LSM) algorithm, and the ALE (Arbitrary Lagrangian-Eulerian) form multi-component Euler governing equations were adopted for fluid dynamics modeling; then, a finite-rate reaction model was used to deal with the chemical reactions in the flow field, a time-division method was applied to solve the stiff problem of chemical reactions, and multi-component AUFS (artificially upstream flux vector splitting) format was introduced to calculate the convective flux term of the governing equation. In addition, the weighted-point filling strategy and the dynamic point cloud method were employed to deal with the topological structure changes in the point clouds caused by the large displacement movement of the projectile in the three-dimensional muzzle flow field. Finally, the proposed mesh-less method was applied to calculate the muzzle of a 12.7mm gun, and accurately captured the bottle-shaped shock wave structure in the complex muzzle flow field and the second muzzle flame phenomenon; the calculation results were compared with the experimental results and obtained a good match, which had proved the feasibility of the proposed 3D-LSM method. The research findings of this paper provided a new solution for the simulation of high-speed non-equilibrium reaction jets with multicomponent and large-displacement moving boundaries.

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A Meshless Solution Method for Unsteady Flow with Moving Boundary

Cited by 3 publications

References 15 publications

Influence of geometrical characteristics of sidewall-type multiple aneurysms on hemodynamic factors

Influence of geometrical characteristics of sidewall-type multiple aneurysms on hemodynamic factors

Numerical study of the switching mechanism of a jet valve using the meshless method

Application of Three-Dimensional Meshless Method in Muzzle Flow Field of Projectile with Large Displacement

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