A numerical scheme based on compact integrated-RBFs and Adams–Bashforth/Crank–Nicolson algorithms for diffusion and unsteady fluid flow problems

Fluid flow in curved channels with various cross-sections, as a common problem in theoretical and applied fluid mechanics, is a very complex and quite undiscovered phenomenon. Defining the optimum shape of the fluid flow boundaries, which would ensure minimum undesirable phenomena, like "dead water" zones, unsteady fluid flow, etc., is one of the crucial hydraulic engineering?s task. Method of kinetic balance is described and used for this purpose, what is illustrated with few examples. .

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INTEGRATED MODEL «RESERVOIR - WELL - PUMP» FOR UNSTEADY FLUID FLOW REGIMES CALCULATING

Petroleum Engineering ◽

10.17122/ngdelo-2021-1-33-41 ◽

2021 ◽

Vol 19 (1) ◽

pp. 33

Author(s):

A.A. Pashali ◽

R.S. Khalfin ◽

D.V. Silnov ◽

A.S. Topolnikov ◽

B.M. Latypov ◽

...

Keyword(s):

Fluid Flow ◽

Flow Regimes ◽

Integrated Model ◽

Unsteady Fluid Flow ◽

Unsteady Fluid ◽

Fluid Flow Regimes

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THE IMPACT OF SELECTED PARAMETERS ON PRESSURE DISTRIBUTION IN THE FACE THROTTLE OF A CENTRIFUGAL PUMP AUTOMATIC BALANCING DEVICE

Tribologia ◽

10.5604/01.3001.0015.6895 ◽

2021 ◽

Vol 297 (3) ◽

pp. 35-44

Author(s):

Yuliia Tarasevych ◽

Nataliia SOVENKO

Keyword(s):

Fluid Flow ◽

Pressure Distribution ◽

Hydrodynamic Pressure ◽

Centrifugal Pumps ◽

Unsteady Fluid Flow ◽

The Face ◽

Unsteady Fluid ◽

Angular Displacements ◽

Automatic Balancing ◽

The Impact

Face throttles are a necessary functional element of non-contact face seals and automatic balancing devices of centrifugal pumps of different constructions. To calculate the hydrodynamic forces and moments acting on the rotor and fluid flow through the automatic balancing device, it is necessary to know the pressure distribution in the cylindrical and face throttle when considering all important factors which predetermine fluid flow. The face throttle surfaces are moving, which leads to unsteady fluid flow. The movement of the walls of the face throttle causes an additional circumferential and radial flow, which subsequently leads to the additional hydrodynamic pressure components. The paper analyses viscous incompressible fluid flow in the face throttle of an automatic balancing device taking into account the axial and angular displacements of throttle’s surfaces and the inertia component of the fluid. The effect of local hydraulic losses as well as random changes in the coefficients of local hydraulic resistance at the inlet and outlet of the throttle is analysed.

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Interactions Between Vortex-Induced Vibration of a Spring-Supported Cylinder and Fluid Flow in a Narrow Channel

5th International Symposium on Fluid Structure International, Aeroeslasticity, and Flow Induced Vibration and Noise ◽

10.1115/imece2002-32166 ◽

2002 ◽

Author(s):

Masahito Nakano ◽

Shinichi Maruyama ◽

Hideyuki Mihira ◽

Masatsugu Yoshizawa

Keyword(s):

Reynolds Number ◽

Fluid Flow ◽

Narrow Channel ◽

Simultaneous Equations ◽

Nonlinear Interactions ◽

Two Dimensional ◽

Vortex Induced Vibration ◽

Incompressible Viscous Flow ◽

Unsteady Fluid Flow ◽

Unsteady Fluid

This paper studies the nonlinear interactions between vortex-induced vibration of a spring-supported circular cylinder and the unsteady fluid flow in a narrow channel. The analytical model consists of two-dimensional incompressible viscous flow in a narrow channel at low Reynolds number, and the spring-supported cylinder that can move perpendicular to the wall of the channel. The marker-and-cell (MAC) method is used to calculate numerically the simultaneous equations governing the interaction between the motion of the cylinder and the unsteady fluid flow. Furthermore the numerical results are confirmed by experiments presented herein.

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