Fully nonlinear interfacial periodic waves in a two-layer fluid with a rigid upper boundary and their loads on a cylindrical pile

Li, Jiyang; Liu, Zeng; Liao, Shijun; Liu, Qian

doi:10.1016/j.oceaneng.2022.112014

Cited by 6 publications

(1 citation statement)

References 22 publications

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“…В работе [2], посвященной разработке высокоскоростных запорных клапанов, признается, что точность опреде-ления общего гидравлического сопротивления изделия и пропускной способности, которая от него зависит, влияет на точность прогнозирования возникновения внештатных ситуаций. Ряд исследователей предлагают использовать методы компьютерного моделирования движения потоков рабочей среды для расчетного определения гидравлического сопротивления: при динамической оценке состава транспортируемой среды [3], анализе скорости срабатывания клапанов пневматической системы [4], проведении гидравлических расчетов сетей со сложной топографией [5][6][7][8], анализе движения жидкостей С в ходе исследования геологических процессов [9][10][11]. Таким образом, развитие методов расчетного определения пропускной способности арматуры необходимо для повышения уровня прогнозируемости эксплуатации распределительных узлов при различных режимах их работы.…”

Section: Introductionunclassified

Analytical Assessment of Valve Throughput Coefficient

Karakulov,

Holova,

Holov

2022

Vestnik IzhGTU imeni M.T. Kalashnikova

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The current level of industry development for the gas and oil production of equipment requires the development of engineering methods for calculating the hydraulic characteristics of manufactured products. Due to the complexity of the designs of distribution and control units for oil and gas transportation networks, the hydraulic characteristics of their control components increasingly affect the performance of regulation. In the construction of distribution and control units, pipeline fittings are used, in particular, wedge gate valves and shut-off valves. One of the main hydraulic characteristics of these products is the throughput, which is assessed by the throughput coefficient. Therefore, now the design engineer needs simple and accurate methods to determine the theoretical value of the throughput coefficient at the design stages of the product. The throughput is related to the hydraulic resistance of the passage part of the pipeline fittings, because it affects the level of pressure reduction when fluid moves from the inlet to the outlet of the product. There are methods for determining local hydraulic resistance caused by a change in the geometry of the passageway, based on the Weisbach formula and empirically determined local resistance coefficients. Engineering methods are proposed for determining the throughput coefficient of two types of pipeline fittings - a wedge valve and a shut-off valve. The methods are based on a well-established approach, expressed in the use of the connection of the throughput with a set of local hydraulic resistances that arise in the path of the working medium. The methods use information about the values of local hydraulic resistance values obtained empirically with the possibility of their approximation to obtain intermediate values of these indicators. The geometric features of the passage channels of the products under consideration are taken into account. They are compared with the existing nomenclature of information about the values of the coefficients of local hydraulic resistance. The proposed methods make it possible to reduce the time for carrying out calculations with obtaining a result whose accuracy is sufficient for use in engineering calculations. Expressions are obtained that allow determining the values of the throughput coefficient of the wedge gate valve and the shut-off valve, taking into account the geometric features and the relative position of the flow sections of pipeline valves, as well as the physical properties of the working medium.

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Section: Introductionunclassified

Analytical Assessment of Valve Throughput Coefficient

Karakulov,

Holova,

Holov

2022

Vestnik IzhGTU imeni M.T. Kalashnikova

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Forces of fully nonlinear interfacial periodic waves on a cylindrical pile in a two-layer fluid with free-surface boundary conditions

Liu

Cui

2023

Journal of Ocean Engineering and Science

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Steady-state interfacial gravity waves with one-dimensional class-IV triad resonance

Li,

Su,

Liu

et al. 2023

Physics of Fluids

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Steady-state interfacial waves under a one-dimensional (1-D) class-IV exact triad resonance are investigated in a two-layer fluid with a free surface upper boundary. Four groups (G1–G4) of convergent series solutions are obtained by the homotopy analysis method. Though the harmonic resonance conditions are contained in the class-IV resonance criteria, the influences of 1:2 harmonic resonances on the energy spectrum could be neglected. Unlike former steady-state resonant interfacial wave spectrum where all the components joining the resonance are significant, the energy of one primary component can be ignored for two groups (G2 and G4) of wave solutions obtained in this paper. It is found that a little energy induced from the external environment might greatly change the energy spectrum for G1. However, the energy introduced from the outside cannot vary the wave energy distribution for G2. The reason for the extremely high crests on the instantaneous profiles of free surfaces of G2 and G4 is that the peaks of the class-IV exactly resonant and some trivial components momentarily overlap at some special horizontal positions. The class-IV exact triad resonance curve could be divided into four pieces containing the existence ranges of G3 and G4 and two regions with no solution found. One of the regions without convergent solutions results from an infinite number of singularities or small divisors caused by infinite exact or near resonances. Our results indicate that steady-state interfacial waves with class-IV triad resonance interactions among one surface and two internal wave modes could exist.

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Fully nonlinear interfacial periodic waves in a two-layer fluid with a rigid upper boundary and their loads on a cylindrical pile

Cited by 6 publications

References 22 publications

Analytical Assessment of Valve Throughput Coefficient

Analytical Assessment of Valve Throughput Coefficient

Forces of fully nonlinear interfacial periodic waves on a cylindrical pile in a two-layer fluid with free-surface boundary conditions

Steady-state interfacial gravity waves with one-dimensional class-IV triad resonance

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