Shock Wave Speed and Transient Response of PE Pipe with Steel-Mesh Reinforcement

Wan, Wuyi; Mao, Xinwei

doi:10.1155/2016/8705031

Cited by 5 publications

(2 citation statements)

References 32 publications

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“…These pressure waves are described as a rapid pressure change that travel at pressure wave speed in the liquid-pipe medium. In pressurized water pipes, the pressure waves travel about 1000 m/s in metallic pipes and around 400 m/s in polymeric pipes (Duan et al 2020, Wan andMao 2016). When these waves encounter discontinuities, they are partially reflected and transmitted through the pipe system.…”

Section: The Wave Characteristic Methods Modelmentioning

confidence: 99%

Unsteady Friction Modeling Technique for Lagrangian Approaches in Transient Simulations

Zeidan,

Ostfeld

2022

Proceedings - 2nd International Join Conference on Water Distribution System Analysis (WDSA)& Computing and Control in the

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This study tackles the problem of simulating the head damping effect in transient flows when modeled in the Lagrangian approach rather than Eulerian. The Lagrangian approach normally requires orders of magnitude fewer calculations, which allows very large systems to be solved in an expeditious manner, and it has the additional advantage of using a simple physical model as the basis for its development. Moreover, since it is continuous in both time and space, the method is less sensitive to the structure of the network and the length of the simulation process, resulting in improved computational efficiency. Nevertheless, most recent studies used an Eulerian approach when simulating the systems transient response (e.g., method of characteristics), thus focused on developing and improving different computational routines for modeling and simulating unsteady friction models that are better fixated for Eulerian methods and are not suited for Lagrangian ones. One-dimensional methods of representing unsteady contributions to skin friction based on instantaneous acceleration have a long track record (e.g., Daily et al. 1956, Carstens and Roller 1959). And it is still the most popular method in software used for practical simulations, despite it cannot accurately depict the system's transient responses without additional calibrations and tunings. However, the more accurate models (e.g., Brunone 2000) are not suited for the Lagrangian approach. The lack of a mesh structure in the Lagrangian approach makes it challenging to consider the convective acceleration terms in addition to the local acceleration. Therefore, there is a need for a more accurate friction model that is suited for Lagrangian methods without compromising their performance. Unfortunately, such a model is yet to be published in the literature. This study presents a new friction modeling technique that compensates for both the local and convective acceleration terms for the Lagrangian transient modeling approach, without compromising the computational time. Additionally, fixating only on the Eulerian approach for transient modeling and undermining the Lagrangian based models is concerning since it can provide different perspectives for developing novel solutions and tools that take advantage of transient events.

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Section: The Wave Characteristic Methods Modelmentioning

confidence: 99%

Unsteady Friction Modeling Technique for Lagrangian Approaches in Transient Simulations

Zeidan,

Ostfeld

2022

Proceedings - 2nd International Join Conference on Water Distribution System Analysis (WDSA)& Computing and Control in the

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“…The more general equation to calculate the wave speed in fluids without air is (Twyman, 2016b;Wan and Mao, 2016;Wylie and Streeter, 1978):…”

Section: Wave Speedmentioning

confidence: 99%

Transient flow analysis using the method of characteristics MOC with five-point interpolation scheme

Twyman

2018

Obras y Proyectos

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Análisis del flujo transiente usando el método de las características con esquema de interpolación de cinco puntos Fecha de entrega: 25 de agosto 2017 Fecha de aceptación: 21 de agosto 2018An original 2 nd -order Method of Characteristics (MOC) which it works with a five-point interpolating scheme valid for solving the hyperbolic and quasilinear partial differential equations that describe the transient flow phenomenon in pipelines is shown. The results obtained by both MOC 2 nd -order and exact solution (MOC 1 st -order) are compared. It is shown that MOC 2 nd -order allows obtain near-to-exact results within a wide range of Courant numbers. Keywords: artificial viscosity, Courant number, method of characteristics 2 nd -order, water hammerSe muestra una versión original del Método de las Características (MC) de 2 do orden que trabaja con un esquema de interpolación de cinco puntos, válido para resolver las ecuaciones diferenciales parciales hiperbólicas y cuasilineales que describen el fenómeno del flujo transiente en redes de tuberías. Se comparan los resultados obtenidos por el MC 2 do orden y la solución exacta (MC 1 er orden). Se demuestra que el MC 2 do orden permite obtener resultados cercanos a los exactos dentro de una amplia gama de números de Courant.Palabras clave: viscosidad artificial, número de Courant, método de las características 2 do orden, golpe de ariete

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Experiments, numerical models and optimization of carbon-epoxy plates damped by a frequency-dependent interleaved viscoelastic layer

Pastor

Sourne

Salle³

et al. 2021

Mechanics of Advanced Materials and Structures

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The research work presented in this paper aims to optimize the dynamic response of a carbon-epoxy plate by including into the laminate one frequency-dependent interleaved viscoelastic layer. To keep an acceptable bending stiffness, some holes are created in the viscoelastic layer, thus facilitating the resin through layer penetration during the co-curing manufacturing process. Plates including (or not) one perforated (or non-perforated) viscoelastic layer are manufactured and investigated experimentally and numerically. First, static and dynamic tests are performed on sandwich coupons to characterize the stiffness and damping properties of the plates in a given frequency range. Resulting mechanical properties are then used to setup a finite element model and simulate the plate dynamic response. In parallel, frequency response measurements are car-ried out on the manufactured plates, then successfully confronted to the numerical results. Finally, a design of experiments is built based on a limited number on numerical simulations to find the configuration of bridges that maximizes the damping while keeping a stiffness higher than half the stiffness of the equivalent undamped plate.

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Shock Wave Speed and Transient Response of PE Pipe with Steel-Mesh Reinforcement

Cited by 5 publications

References 32 publications

Unsteady Friction Modeling Technique for Lagrangian Approaches in Transient Simulations

Unsteady Friction Modeling Technique for Lagrangian Approaches in Transient Simulations

Transient flow analysis using the method of characteristics MOC with five-point interpolation scheme

Experiments, numerical models and optimization of carbon-epoxy plates damped by a frequency-dependent interleaved viscoelastic layer

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