Numerical Simulation of Flow Field in Coaxial Tank Gun Recoil Damper

Elsaady, Wael Abdelmoneam; Ibrahim, A. Z.; Abd-Alla, A. M.

doi:10.3849/aimt.01287

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…This is the most extensively tested and applied turbulence model. On this basis, scholars have studied and improved the eddy viscosity model [4]. We introduce the standard kÀe model of wall function processing to the near-wall area where there is a dense bottom layer and transition zone.…”

Section: Basic Situation Of Turbulence Modementioning

confidence: 99%

Numerical Simulation of the Influence of Water Flow on the Piers of a Bridge for Different Incidence Angles

Huang¹

2023

Fluid Dynamics &Amp; Materials Processing

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A two-dimensional mathematical model is used to simulate the influence of water flow on the piers of a bridge for different incidence angles. In particular, a finite volume method is used to discretize the Navier-Stokes control equations and calculate the circumferential pressure coefficient distribution on the bridge piers' surface. The results show that the deflection of the flow is non-monotonic. It first increases and then decreases with an increase in the skew angle. KEYWORDSBridge pier; water flow simulation; impact resistance; flow field around flow; model; fluid mechanics IntroductionAfter the bridge is built in a natural river, due to the compression and interference of the bridge piers on the water flow, a series of changes near the bridge location can occur. Due to the partial water blocking effect of the pier, the flow velocity upstream of the dock slows down, and the water level is high as a result. Its impact on the upstream and downstream involves the flood control safety of the dams on both sides of the bank, nearby cities, as well as factories and mines. The water flow structure at the bridge pier is more complicated [1]. On the front side of the bridge pier, the water flows down and flows around on both sides to form a horseshoe-shaped vortex on the bed surface. The boundary layer around the piers separates to create a wake vortex. Furthermore, small vortices are released from the bed surface behind and on both sides of the pier. In addition, many factors cause local water flow changes in bridge piers.

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Section: Basic Situation Of Turbulence Modementioning

confidence: 99%

Numerical Simulation of the Influence of Water Flow on the Piers of a Bridge for Different Incidence Angles

Huang¹

2023

Fluid Dynamics &Amp; Materials Processing

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“…It should be noted that MR dampers involve complicated flow behaviours which are not only caused by the interaction between electromagnetism and fluid flow but also affected by other phenomena, such as heat generation, fluid compressibility, aeration, cavitation, turbulence and presence of air as a large pocket in some designs of MR dampers, or as bubbles in the MR fluid itself (Czop and Gniłka, 2017; Elsaady et al, 2019, 2020; Guo et al, 2013, 2019; Jelali, 2003; Zheng et al, 2014). Heat generation in MR dampers occurs due to friction between the fluid layers.…”

Section: Characteristics Advantages and Limitations Of Numerical mentioning

confidence: 99%

A review on multi-physics numerical modelling in different applications of magnetorheological fluids

Elsaady

Oyadiji

Nasser

2020

Journal of Intelligent Material Systems and Structures

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Magnetorheological fluids involve multi-physics phenomena which are manifested by interactions between structural mechanics, electromagnetism and rheological fluid flow. In comparison with analytical models, numerical models employed for magnetorheological fluid applications are thought to be more advantageous, as they can predict more phenomena, more parameters of design, and involve fewer model assumptions. On that basis, the state-of-the-art numerical methods that investigate the multi-physics behaviour of magnetorheological fluids in different applications are reviewed in this article. Theories, characteristics, limitations and considerations employed in numerical models are discussed. Modelling of magnetic field has been found to be rather an uncomplicated affair in comparison to modelling of fluid flow field which is rather complicated. This is because, the former involves essentially one phenomenon/mechanism, whereas the latter involves a plethora of phenomena/mechanisms such as laminar versus turbulent rheological flow, incompressible versus compressible flow, and single- versus two-phase flow. Moreover, some models are shown to be still incapable of predicting the rheological nonlinear behaviour of magnetorheological fluids although they can predict the dynamic characteristics of the system.

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“…(iii) Hydraulic dampers, in general, are closed systems (no inlets or outlets for the fluid). This causes the dampers to be liable to nonlinear effects caused by aeration, cavitation and possible turbulence (Czop and Gni1ka, 2017;Elsaady et al, 2019). Aeration may be caused due to improper sealing of the MR fluid in the damper or due to the presence of air dissolved in the fluid itself.…”

Section: Introductionmentioning

confidence: 99%

Study of failure symptoms of a single-tube MR damper using an FEA-CFD approach

Elsaady

Oyadiji

Nasser

2020

Journal of Intelligent Material Systems and Structures

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A new magnetorheological (MR) damper has been designed, manufactured, modelled and tested under cyclic loads. A faulty behaviour of the damper was accidentally detected during the experiments. It was deduced that the presence of air bubbles within the MR fluid is the main reason for that failure mode of the damper. The AMT-Smartec+ MR fluid used in the current study, a new MR fluid whose characteristics are not available in the literature, exhibits good magnetic properties. However, the fluid has a very high viscosity in the absence of magnetic field. It is assumed that this high viscosity enables the retention of air bubbles in the damper and causes the faulty behaviour. To prove this assumption, a coupled numerical approach has been developed. The approach incorporates a Finite Element Analysis (FEA) of the magnetic circuit and a Computational Fluid Dynamics (CFD) analysis of the fluid flow. A similar approach was presented in a previous publication in which an ideal behaviour of an MR damper (no effect of air bubbles) was investigated. The model has been modified in the current study to include the effect of air bubbles. The results were found to support the assumptions for the reasons of the failure symptoms of the current MR damper. The results are shown in a comparative way between the former and current studies to show the differences in flow parameters, namely: pressure, velocity and viscosity, in the faultless and faulty modes. The results indicate that the presence of air bubbles in MR dampers reduces the damper force considerably. Therefore, the effect of the high yield stress of MR fluids due to the magnetic field is reduced.

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Numerical Simulation of Flow Field in Coaxial Tank Gun Recoil Damper

Cited by 5 publications

References 4 publications

Numerical Simulation of the Influence of Water Flow on the Piers of a Bridge for Different Incidence Angles

Numerical Simulation of the Influence of Water Flow on the Piers of a Bridge for Different Incidence Angles

A review on multi-physics numerical modelling in different applications of magnetorheological fluids

Study of failure symptoms of a single-tube MR damper using an FEA-CFD approach

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