scholarly journals Numerical and Experimental Comparative Study on the Flow-Induced Vibration of a Plane Gate

Water ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1551
Author(s):  
Chunying Shen ◽  
Wei Wang ◽  
Shihua He ◽  
Yimin Xu
Keyword(s):  
Flow Field ◽  
Pressure Coefficient ◽  
Three Dimensional ◽  
Surface Profile ◽  
Computational Method ◽  
Unstable Flow ◽  
Flow Induced Vibration ◽  
Fluid Structure ◽  
Vof Model ◽  
Vibration Parameters

A numerical method is applied here to simulate the unstable flow and the vibration of a plane gate. A combination of the large eddy simulation (LES) method and the volume of fluid (VOF) model is used to predict the three-dimensional flow field in the vicinity of a plane gate with submerged discharge. The water surface profile, the streamline diagrams, the distribution of turbulent kinetic energy, the power spectrum density curve of the fluctuating pressure coefficient at typical points underneath the gate, and the complete vortex distribution around the gate are obtained by LES-VOF numerical calculation. The vibration parameters of the gate are calculated by the fluid-structure coupling interface transferring the hydrodynamic load. A simultaneous sampling experiment is performed to verify the validity of the algorithm. The calculated results are then compared with experimental data. The difference between the two is acceptable and the conclusions are consistent. In addition, the influence of the vortex in the slot on the flow field and the vibration of the gate are investigated. It is feasible to replace the experiment with the fluid-structure coupling computational method, which is useful for studying the flow-induced vibration mechanism of plane gates.

Numerical Investigation of Hydroelastic Response of a Three-Dimensional Deformable Hydrofoil

2020 ◽  
Author(s):  
Saeed Hosseinzadeh ◽  
Kristjan Tabri
Keyword(s):  
Pressure Coefficient ◽  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Leading Edge ◽  
Elastic Response ◽  
Fluid Structure ◽  
Strongly Coupled ◽  
Structure Interaction ◽  
Lift And Drag ◽  
Hydroelastic Response

The present study is concerned with the numerical simulation of Fluid-Structure Interaction (FSI) on a deformable three-dimensional hydrofoil in a turbulent flow. The aim of this work is to develop a strongly coupled two-way fluid-structure interaction methodology with a sufficiently high spatial accuracy to examine the effect of turbulent and cavitating flow on the hydroelastic response of a flexible hydrofoil. A 3-D cantilevered hydrofoil with two degrees-of-freedom is considered to simulate the plunging and pitching motion at the foil tip due to bending and twisting deformation. The defined problem is numerically investigated by coupled Finite Volume Method (FVM) and Finite Element Method (FEM) under a two-way coupling method. In order to find a better understanding of the dynamic FSI response and stability of flexible lifting bodies, the fluid flow is modeled in the different turbulence models and cavitation conditions. The flow-induced deformation and elastic response of both rigid and flexible hydrofoils at various angles of attack are studied. The effect of three-dimension body, pressure coefficient at different locations of the hydrofoil, leading-edge and trailing-edge deformation are presented and the results show that because of elastic deformation, the angle of attack increases and it lead to higher lift and drag coefficients. In addition, the deformations are generally limited by stall condition and because of unsteady vortex shedding, the post-stall condition should be considered in FSI simulation of deformable hydrofoil. To evaluate the accuracy of the numerical model, the present results are compared and validated against published experimental data and showed good agreement.

Axial evolution of forced helical flame and flow disturbances

2018 ◽  
Vol 844 ◽  
pp. 323-356 ◽  
Author(s):  
Travis E. Smith ◽  
Christopher M. Douglas ◽  
Benjamin L. Emerson ◽  
Timothy C. Lieuwen
Keyword(s):  
Flow Field ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Unstable Flow ◽  
Natural Oscillations ◽  
Planar Velocity ◽  
Fluorescence Measurements ◽  
Flow Disturbances ◽  
Planar Laser ◽  
Acoustic Forcing

This paper presents 5 kHz stereo particle image velocimetry and OH planar laser induced fluorescence measurements of transversely forced swirl flames. The presence of transverse forcing on this naturally unstable flow both influences the natural instabilities, as well as amplifies disturbances that may not necessarily manifest themselves during natural oscillations. By manipulating the structure of the acoustic forcing field, both axisymmetric and helical modes are preferentially excited away from the frequency of natural instability. The paper presents a method for spatially interpolating the phase locked $r{-}z$ and $r{-}\unicode[STIX]{x1D703}$ planar velocity and flame position data, extracting the full three-dimensional structure of the helical disturbances. These helical disturbances are also decomposed into symmetric and anti-symmetric disturbances about the jet core, showing the subsequent axial evolution (in magnitude and phase) of each of these underlying disturbances. It is shown that out-of-phase acoustic forcing excites $m=\pm 1$ modes, but the flow field preferentially amplifies the counter-winding, co-rotating helical disturbance over the co-winding, counter-rotating helical disturbance. This causes the flow and flame to transition from a transverse flapping near the jet exit to a precessing motion further downstream. In contrast, in-phase forcing promotes axisymmetric $m=0$ disturbances which dominate the flow field over the entire axial domain. In both cases, the amplitudes of the anti-symmetric disturbances about the jet core grow with downstream distance before saturating and decaying, while the symmetric disturbances appear nearly negligible. It is suggested that this saturation and decay is due to linear effects (e.g. a negative spatial growth rate), rather than nonlinear interactions.

Flow Field Analysis and Numerical Simulation for Pipe with Tee on Fluid-Structure Coupling

2012 ◽  
Vol 503-504 ◽  
pp. 768-771
Author(s):  
Zhong Bin Liu ◽  
Feng Luo ◽  
Tao Zeng ◽  
Hui Wu
Keyword(s):  
Flow Field ◽  
Mechanical Stability ◽  
Three Dimensional ◽  
Main Flow ◽  
Field Analysis ◽  
Fluid Structure ◽  
Coulomb Failure ◽  
Flow Field Analysis ◽  
Simulation Results ◽  
Graphics Software

Y-shaped tee is modeled by three-dimensional graphics software and its flow field is analyzed and numerical simulated by CFD software. The mechanical stability of Y-shaped tee in the work process is analyzed by fluid-structure coupling. The results show that the pressure of water is gradually decreased and the velocity of water is gradually increased as the main flow is near Y-shaped tee; the branch of pipeline exits the largest failure risk by the coulomb failure expression. Simulation results are consistent to the practice, which provides important theoretical basis for improving and optimization of Y-shaped tee.

Dynamic Analysis of Rotary Drillstring in Horizontal Well Based on the Fluid-Structure Interaction

2013 ◽  
Vol 385-386 ◽  
pp. 146-149
Author(s):  
Min Luo ◽  
Ting Ting Xu ◽  
Ting Ting Zhao ◽  
Wen Xin Zhao ◽  
Ju Bao Liu
Keyword(s):  
Dynamic Analysis ◽  
Horizontal Well ◽  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Momentum Equation ◽  
Computational Method ◽  
Fluid Equation ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Fluidstructure Interaction

With the development of drilling technology, rotary drillstring not only produces random multi-directional collisions with the inner wall of pipe, also couples with the inner and outer annular fluids. This results in a complex system of nonlinear fluid-structure interaction. In the paper, structure and mode of operation about rotary drillstring are considered, the equations of the structure dynamics, fluid equation of continuity and momentum equation are coupled. The three-dimensional numerical model and computational method is established about the fluidstructure interaction dynamic analysis of rotary drillstring. Take the rotary drillstring and inner and outer fluids as a research object, dynamic analysis of the rotary drillstring is finished, considering the fluid-structure coupled characteristics and compare the air medium, the results show the effect of fluidstructure interaction. It can provide the feasible method for the study of the string in the oil drilling and production engineering and conduct the development of drillstring dynamics in horizontal well drilling engineering.

Flow-Induced Vibration Characteristics of Steam Generator U-Tubes With Defect

2003 ◽  
Author(s):  
Jong-Chull Jo ◽  
Myung Jo Jhung ◽  
Woong-Sik Kim ◽  
Hho-Jung Kim
Keyword(s):  
Flow Field ◽  
Steam Generator ◽  
Damping Ratio ◽  
Three Dimensional ◽  
Added Mass ◽  
Shell Side ◽  
Flow Induced Vibration ◽  
Stability Ratio ◽  
Fluidelastic Instability ◽  
Side Flow

This paper investigates the fluidelastic instability characteristics of steam generator (SG) U-tubes with defect. The operating SG shell-side flow field conditions for determining the fluidelastic instability parameters such as damping ratio and added mass are obtained from three-dimensional SG flow calculation. Modal analyses are performed for the U-tubes either with axial or circumferential flaw with different sizes. Special emphases are on the effects of flaw orientation and size on the modal and instability characteristics of tubes, which are expressed in terms of the natural frequency, corresponding mode shape and stability ratio.

scholarly journals The Unsteady Numerical Simulation and Fluid-Structure Interaction Analysis of TLB600-700 Desulphurization Pump

2014 ◽  
Vol 6 ◽  
pp. 191697
Author(s):  
Xiaoke He ◽  
Jianrui Liu ◽  
Dengpeng Fu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Design Method ◽  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Internal Flow ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Design Requirements ◽  
Unsteady Numerical Simulation

Based on the design theory of liquid-solid two-phase flow centrifugal pump, a new type TLB600-700 desulphurization pump was designed with huge distortions blades design method and impeller inlet super long extension blades design method. Three-dimensional model of internal flow field in TLB600-700 desulphurization pump was built by software PROE5.0, and the three-dimensional unsteady numerical simulation of the internal flow field was calculated, which revealed that the rotor-stator interaction between rotating impeller and volute is the reason why unstable flow generated. Statics analysis was carried out on the impeller in the stationary flow state with the method of fluid-structure interaction, and results indicated that the impeller strength and stiffness meet the design requirements. External characteristic test results of TLB600-700 desulphurization pump showed that all parameters of desulphurization pump designed by innovative method meet design requirements; especially the pump efficiency was increased by 4.15% higher than Chinese national standard.

Numerical evaluation of the side wall effect on the flow around a hydrofoil

2014 ◽  
Vol 31 (3) ◽  
pp. 501-509 ◽  
Author(s):  
Min He ◽  
Lingli Yuan ◽  
Lingjiu Zhou ◽  
Jing Yang ◽  
Zhengwei Wang
Keyword(s):  
Flow Field ◽  
Turbulence Model ◽  
Lift Coefficient ◽  
Pressure Coefficient ◽  
Three Dimensional ◽  
Side Wall ◽  
Wall Effect ◽  
Scale Model ◽  
Content Type ◽  
Rng Turbulence Model

Purpose – Studies of the three-dimensional flow characteristics during hydrofoil cavitation have shown that the side walls strongly affect the flow field around the hydrofoil. The purpose of this paper is to analyze the side wall effect for three-dimensional non-cavitating flows around a hydrofoil. Design/methodology/approach – A three-dimensional non-cavitating flow field around a hydrofoil is analyzed for different attack angles using the RNG turbulence model and large eddy simulations (LES). The effect of the hydrofoil span was analyzed using LES simulations for various spans. Findings – The lift coefficient, drag coefficient and pressure coefficient on the suction side are compared with experimental values. The results from the LES model (Smagorinsky-Lilly subgrid-scale model) agree better with the experimental data than those from the RNG turbulence model. Originality/value – This paper shows that the flow around the hydrofoil has significant three-dimensional characteristics due to the side wall. For wide hydrofoils, the wall vortex region becomes essentially stable, and the width of the span has little effect on the middle region.

A Three Dimensional Simulation Model for Liquid Phase Electroepitaxy Under Magnetic Field

2002 ◽  
Author(s):  
Yoncai Liu ◽  
Hamdi Sheibani ◽  
Susumu Sakai ◽  
Yasunori Okano ◽  
Sadik Dost
Keyword(s):  
Magnetic Field ◽  
Liquid Phase ◽  
Flow Field ◽  
Three Dimensional ◽  
Flow Patterns ◽  
Stable Region ◽  
Transitional Region ◽  
Unstable Flow ◽  
Growth Interface ◽  
Flow Intensity

A three-dimensional numerical simulation for the Liquid Phase Electroepitaxial (LPEE) growth of GaAs under a vertical stationary magnetic field was carried out. The effect of magnetic field intensity on the flow field in the liquid solution was investigated. Numerical results show that the flow patterns exhibit three distinct stability characteristics: a stable flow field up to a magnetic field level of Ha = 150, a transitional flow between Ha = 150 and Ha = 220, and an unstable flow above Ha = 220. In the stable region, the applied magnetic field suppresses the flow field, and the flow intensity decreases with increasing magnetic field. In the transitional region, the flow intensity increases dramatically with increase in the magnetic field strength. The flow patterns are significantly different from those in the stable region. The flow field is no longer axisymmetric but still stable. In the unstable region, the flow structure and intensity change with time. Under a strong magnetic field, the flow cells are confined to the vicinity of the vertical wall and exhibit significant non-uniformity near the growth interface. Such strong flow fluctuations and non-uniformities near the growth interface may have an adverse effect on the growth process and lead to an unsatisfactory growth.

Study on Dynamic Characteristics and Flow Induced Vibration of Tube Bundles Based on the Fluid Structure Coupling Method

2018 ◽  
Author(s):  
Zhipeng Feng ◽  
Qian Huang ◽  
Shuai Liu ◽  
Fengchun Cai ◽  
Xi Lv ◽  
...  
Keyword(s):  
Numerical Model ◽  
Dynamic Characteristics ◽  
Wave Equations ◽  
Tube Bundle ◽  
Three Dimensional ◽  
External Flow ◽  
Dynamic Equations ◽  
Tubular Structures ◽  
Flow Induced Vibration ◽  
Fluid Structure

In order to study the dynamic characteristics and fluid structure interactions of tubular structures under the action of fluid in reactor, such as fuel rod bundles and heat transfer tube bundle of steam generator, the dynamic equations and the acoustic wave equations of structures are discretized by finite element method. The acoustic wave equations are simplified from continuity equation and momentum equation of fluid field. Based on the fluid structure coupling method, the dynamic characteristics of the tube under the internal flow, external flow and combined action of internal and external flow are calculated respectively. The influence of flow field domain, element type and grid number on the dynamic characteristics of the tube is also analyzed. Secondly, based on the computational fluid dynamics and computational structural dynamics, the interaction between the two physical fields of fluid and structure is considered simultaneously. The finite volume method is used to discretize the fluid control equations and the turbulent flow is investigated using the large eddy simulation method (LES). The Newmark algorithm is used to solve the structural dynamic equations. Combined with the dynamic mesh control technique, a numerical model for flow induced vibration of three-dimensional flexible tube is established. Finally, the flow induced vibration of a three dimensional flexible single tube and a square arrangement tube bundle is calculated using the numerical model. By comparing with the existing research results, it is found that the numerical simulation results are in good agreement with the experimental results. Thus, the correctness of the model is verified. It is also shown that the numerical model established in this paper can be used to simulate the dynamic characteristics and flow induced vibration of tubular structures.

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