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Dynamic modelling and engineering simulation of fluid mechanics in water injectors

Petroleum Exploration and Development 2023年第5期50卷 1236-1245页

作者： JIA Deli WEN Haoyang SUN Fuchao WANG Quanbin YANG Qinghai FU Tao PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China School of Information Science and Engineering China University of Petroleum(Beijing)Beijing 102249China

To study the fluid dynamic response mechanism under the working condition of water injection well borehole,based on the microelement analysis of fluid mechanics and the classical theory of hydrodynamics,a fluid microelement pressure-flow rate relationship model is built to derive and solve the dynamic distribution of fluid pressure and flow rate in the space of well *** with the production data of a typical deviated well in China,numerical simulations and analyses are carried out to analyze the dynamic distribution of wellbore pressure at different injection pressures and injection volumes,the delayed and attenuated characteristics of fluid transmission in tube,and the dynamic distribution of wellbore pressure amplitude under the fluctuation of wellhead *** pressure loss along the wellbore has nothing to do with the absolute pressure,and the design of the coding and decoding scheme for wave code communication doesn’t need to consider the absolute pressure during *** the injection pressure is constant,the higher the injection flow rate at the wellhead,the larger the pressure loss along the *** fluid wave signal delay amplitude mainly depends on the length of the *** smaller the tubing diameter,the larger the fluid wave signal attenuation *** higher the target wave code amplitude(differential pressure identification root mean square)generated at the same well depth,the greater the wellhead pressure wave amplitude required to overcome the wellbore pressure loss.

关键词： zonal water injection wellbore fluid fluid mechanics dynamic response wireless communication

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fluid mechanics OF MICROVASCULAR VASOMOTION AND THE EFFECTS OF BLOOD VISCOELASTICITY

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Applied Mathematics and mechanics(English Edition) 1992年第2期13卷 173-180页

作者：郭仲三 Institute of Mathematical Sciences Chengdu Branch Academia Sinica Chengdu

This paper deals with blood flow caused by microvascular vasomotion with the focus on the effects of blood viscoelasticity on the pressure rise and wall resistance. It is shown that microvascular vasomotion plays a role of the 'second heart' of the body which is of importance in conveying blood, and that the effects of blood viscoelasticity greatly depend on the Weissenberg number and mean flow rate.

关键词： fluid mechanics Viscoelasticity

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Applying machine learning to study fluid mechanics

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Acta Mechanica Sinica 2021年第12期37卷 1718-1726页

作者： Steven L.Brunton Department of Mechanical Engineering University of WashingtonSeattleWA 98195USA

This paper provides a short overview of how to use machine learning to build data-driven models in fluid *** process of machine learning is broken down into five stages:(1)formulating a problem to model,(2)collecting and curating training data to inform the model,(3)choosing an architecture with which to represent themodel,(4)designing a loss function to assess the performance of the model,and(5)selecting and implementing an optimization algorithm to train the *** each stage,we discuss how prior physical knowledge may be embedding into the process,with specific examples from the field of fluid mechanics.

关键词： Machine learning fluid mechanics Physics-informed machine learning Neural networks Deep learning

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Artificial intelligence in fluid mechanics

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Acta Mechanica Sinica 2021年第12期37卷 1715-1717页

作者： Wei-Wei Zhang Bernd R.Noack School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China Center for Turbulence Control Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

The rapid generation of high-quality flow data and the development of increasingly powerful artificial intelligence methods foster novel highly fruitful research paradigms for solving big challenge problems in fluid *... 详细信息

关键词： fluid mechanics Machine learning Articificial intelligene

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Painlevé analysis, auto-Bäcklund transformations, bilinear forms and soliton solutions for a(2+1)-dimensional variable-coefficient modified dispersive water-wave system in fluid mechanics

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Communications in Theoretical Physics 2023年第2期75卷 46-55页

作者： Fei-Yan Liu Yi-Tian Gao Ministry-of-Education Key Laboratory of fluid mechanics and National Laboratory for Computational fluid Dynamics Beijing University of Aeronautics and AstronauticsBeijing 100191China

In this paper,we investigate a(2+1)-dimensional variable-coefficient modified dispersive waterwave system in fluid *** prove the Painlevéintegrability for that system via the Painlevé*** find some auto-B?cklund transformations for that system via the truncated Painlevé*** forms and N-soliton solutions are constructed,where N is a positive *** discuss the inelastic interactions,elastic interactions and soliton resonances for the two *** also graphically demonstrate that the velocities of the solitons are affected by the variable coefficient of that system.

关键词： fluid mechanics variable-coefficient modified dispersive water-wave system Painlevéanalysis bilinear forms soliton solutions auto-Bäcklund transformations

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A UNIVERSAL VARIATIONAL FORMULATION FOR TWO DIMENSIONAL fluid mechanics

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Applied Mathematics and mechanics(English Edition) 2001年第9期22卷 989-996页

作者： HE Ji-huan(何吉欢) Shanghai Institute of Applied Mathematics and mechanics Shanghai University Shanghai 200072 P R China

A universal variational formulation for two dimensional fluid mechanics is obtained. which is subject to the so-called parameter-constrained equations (the relationship between parameters in two governing equations). By eliminating the constraints the generalized variational principle (GVPs) can be readily derived from the formulation The formulation can be applied to any conditions in case the governing equations can be converted into conservative forms. Some illustrative examples are given to testify the effectiveness and simplicity of the method.

关键词： fluid mechanics variational theory

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Using Image Processing Technology and General fluid mechanics Principles to Model Smoke Diffusion in Forest Fires

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fluid Dynamics & Materials Processing 2021年第6期17卷 1213-1222页

作者： Liying Zhu Ang Wang Fang Jin Institute of Civil Engineering Huanghe S&T UniversityZhengzhou450063China

In the present study,the laws of smoke diffusion during forest fires are determined using the general principles of fluid mechanics and dedicated data obtained experimentally using an“ad hoc”imaging *** images mimicking smoke in a real scenario are used to extract some“statistics”.These in turn are used to obtain the“divergence”of the flow(this fluid-dynamic parameter describing the amount of air that converges to a certain place from the surroundings or vice versa).The results show that the divergence of the smoke depends on the outside airflow and finally tends to zero as time *** remarkably,compared with clouds and fog,smoke has a unique dynamic time-evolution *** present study demonstrates that as long as image processing technology and intelligent monitoring technology are used to monitor the gas flow in a forest,the occurrence of forest fires can be quickly diagnosed.

关键词： fluid mechanics image processing smoke diffusion forest fire

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HIERARCHIAL STRUCTURE THEORY FOR BASIC EQUATIONS OF fluid mechanics (BEFM) AND THE SIMPLIFIED NAVIER-STOKES EQUATIONS (SNSE)

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Acta Mechanica Sinica 1988年第2期4卷 112-123页

作者： Gao Zhi, Institute of mechanics, Academia Sinia, Beijing Institute of mechanics Academia Sinia Beijing

A hierarchial structure for the basic equations of fluid mechanics (BEFM) is found throughthe analysis of scales of length and time that proves a measure of the rate of change of the quantities describingthe motion of the fluid as well as an estimation of the order of magnitude of various terms included in *** hierarchial structure theory shows that if (1) the characteristic Reynolds numbers Re is larger than unityand (2) the length scale in one coordinate direction is larger than that in other coordinate directions. BEFM canbe classified into some levels according to the estimation of the order of magnitude of various terms includedin BEFM. The hierarchial structure of BEFM has two branches: one is from BLE- to BEFM inner hierarchy, other is from EE-to BEFM outer hierarchy, where BLE and EE are abbreviations of the boundary-layerequations and of Euler equations, respectively. The relationship between the two branches of the hierarchialstructure, the characteristics, subcharacteristics and mathematical properties of the hierarchial equations arestudied. A comparison between the present hierarchial equations and the Simplified Navier-Stokes equations(SNSE) appeared in literatures is also made. BLE-, EE-and Inner-outer-matched (IOM) equationshierarchies are the most important and useful three levels for solving viscous flow-fields approximately.

关键词： fluid mechanics viscous flows Navier-Stokes equations scale model characteristics methods

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A Brief Introduction to fluid mechanics 2nd ed

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2001年

作者： Young Donald F.

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Multi-media fluid mechanics [computer file].

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2000年

作者：匿名

Companion to any standard fluid mechanics text. Uses standard notations and definitions, with instructive text that accompanies all of the animations and videos. Material can be accessed through hyperlinked text, a se... 详细信息

ISBN: (纸本)0521787483

关键词： fluid mechanics Interactive multimedia.

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