scholarly journals Analysis of Fluid–Structure Coupling Vibration Mechanism for Subsea Tree PipelineCombined with Fluent and Ansys Workbench

Water ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 955
Author(s):  
Gongxing Wu ◽  
Xiaolong Zhao ◽  
Danda Shi ◽  
Xiaodong Wu
Keyword(s):  
Flow Field ◽  
Tree Model ◽  
Coupling Vibration ◽  
Fluid Structure ◽  
Variable Diameter ◽  
Safe Production ◽  
Oil Exploitation ◽  
Vibration Mechanism ◽  
The Given ◽  
Ansys Workbench

In the process of oil exploitation, subseatrees sometimes vibrate. In this paper, fluid–structure coupling software was used to study the causes of subsea tree vibration. First, the complex subsea tree model wassimplified, and ageometric grid model wasestablished for software calculation. Then, under the given two working conditions, the software Fluent wasused to analyze the pressure and velocity distribution of the subsea tree pipeline’s flow field. It was found that the pressure of the flow field changed greatly at the variable diameter and right-angles. Using Ansys Workbench software, flow-structure coupling calculations and modal analysis of the subsea tree werecarried out. The results showed that the vibration of the long straight pipeline section wassevere. Finally, the paper puts forward the measures to reduce the vibration of subsea tree pipelines and provides construction advice for the safe production of subsea trees.

scholarly journals Study on Fluid-Structure Coupling Vibration of Compressor Pipeline

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Jia Wu ◽  
Chunjie Li ◽  
Shuiying Zheng ◽  
Jingheng Gao
Keyword(s):  
Natural Frequencies ◽  
Actual Situation ◽  
Time Step ◽  
Coupling Vibration ◽  
Fluid Structure ◽  
Practical Engineering ◽  
Grid Nodes ◽  
Pipeline Vibration ◽  
Fifth Order ◽  
The Given

In practical engineering, pipeline vibration is often not caused by a single factor but by a combination of many factors. A fluid-structure coupling method is proposed in this paper and used to study the vibration of the compressor pipeline under the interaction of pipeline structure and airflow in it. The method is based on structured grids, so that the displacements of grid nodes can be calculated accurately at each time step. The results of transient calculation show that when the given inlet mass flow rate is constant and there is no other disturbance, the pressure fluctuation and the vibration of pipeline structure will occur by using fluid-structure coupling, and the vibration frequencies are consistent with the third- and fifth-order structural natural frequencies. Moreover, the higher the pressure in the pipe, the greater the fluid-structure coupling vibration. In addition, the fluid-structure coupling vibration not only occurs in the studied pipeline but also propagates to distant downstream pipeline. Comparing the above results with experimental results, it is found that the results of fluid-structure coupling calculation are in agreement with the actual situation, which shows that the method is reasonable and reliable and can be applied to engineering.

scholarly journals Cross-Flow Tidal Turbines with Highly Flexible Blades—Experimental Flow Field Investigations at Strong Fluid–Structure Interactions

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 797
Author(s):  
Stefan Hoerner ◽  
Iring Kösters ◽  
Laure Vignal ◽  
Olivier Cleynen ◽  
Shokoofeh Abbaszadeh ◽  
...  
Keyword(s):  
Flow Field ◽  
High Speed ◽  
Cross Flow ◽  
Speed Ratio ◽  
Fluid Structure Interactions ◽  
Dimensional Parameter ◽  
Fluid Structure ◽  
Passive Flow Control ◽  
Tidal Turbines ◽  
Tidal Turbine

Oscillating hydrofoils were installed in a water tunnel as a surrogate model for a hydrokinetic cross-flow tidal turbine, enabling the study of the effect of flexible blades on the performance of those devices with high ecological potential. The study focuses on a single tip-speed ratio (equal to 2), the key non-dimensional parameter describing the operating point, and solidity (equal to 1.5), quantifying the robustness of the turbine shape. Both parameters are standard values for cross-flow tidal turbines. Those lead to highly dynamic characteristics in the flow field dominated by dynamic stall. The flow field is investigated at the blade level using high-speed particle image velocimetry measurements. Strong fluid–structure interactions lead to significant structural deformations and highly modified flow fields. The flexibility of the blades is shown to significantly reduce the duration of the periodic stall regime; this observation is achieved through systematic comparison of the flow field, with a quantitative evaluation of the degree of chaotic changes in the wake. In this manner, the study provides insights into the mechanisms of the passive flow control achieved through blade flexibility in cross-flow turbines.

scholarly journals The Research Of Fluid-structure Interaction Of The Hydrocyclone Under The Condition Of Vibration

2019 ◽  
Vol 118 ◽  
pp. 02075
Author(s):  
Xu Dekui
Keyword(s):  
Flow Field ◽  
Flow Characteristic ◽  
Fluid Structure Interaction ◽  
Tangential Velocity ◽  
Vibration Frequencies ◽  
Spatiotemporal Evolution ◽  
External Disturbances ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Structural Motion

During the operation of the hydrocyclone, vibrations are often generated by internal fluids and external disturbances resulting in fluid-structure interaction, causing the spatiotemporal evolution of the flow field and the movement of the structure. In this paper, the flow characteristic and the structural motion of the periodic vibrating hydrocyclones are studied. The bidirectional fluid-solid model of hydrocyclone under vibration condition is established. The flow field and structure motion under different vibration frequencies and structure resonances are studied. It shows that the velocities in the three directions oscillate positively and negatively with the motion of structure, the amplitude of the oscillation is the largest on resonance, the skewing of the velocity in the flow field is smaller than the structure; the tangential velocity is asymmetric and the radial velocity is increased significantly, the deformation of the structure is different on the different vibration frequencies, which causes the flow field of distribution of each section to be different. This study will provide the theoretical guidance for the application of hydrocyclone under the vibration conditions.

Numerical simulation of fluid-structure interaction in the opening process of conical parachute

2009 ◽  
Vol 113 (1141) ◽  
pp. 165-175
Author(s):  
Y. Cao ◽  
Z. Wu ◽  
Q. Song ◽  
J. Sheridan
Keyword(s):  
Flow Field ◽  
Deformation Process ◽  
Fluid Structure Interaction ◽  
Field Variation ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Parachute System ◽  
Computational Fluid Dynamics Cfd ◽  
Flexible Canopy ◽  
Opening Process

Abstract According to multi-node model, the dynamics equations of conical parachute system for simulating shape deformation process of the flexible canopy in the opening process were established. With the combination of dynamics equations code and computational fluid dynamics (CFD) software, the fluid-structure interaction investigation of the conical parachute was carried out. Also the change of parachute shape and flow field, inflation time, the rate of descent, the distance of descent, and other relevant data were achieved. This paper has focused on analysing vortex structure of the flow field in the opening process of conical parachute, and laid the foundation for studying mechanics mechanism of flow field variation of conical parachute in future.

scholarly journals Mechanical Vibration Mechanism Motion Simulation of Ultrasonic Composite Vibration Polishing Equipment

2018 ◽  
Vol 237 ◽  
pp. 01014
Author(s):  
Wan Hongqiang ◽  
Han Peiying ◽  
Ge Shuai ◽  
Fancong Li ◽  
Zhang Simiao
Keyword(s):  
Theoretical Analysis ◽  
Theoretical Basis ◽  
Mechanical Vibration ◽  
Motion Simulation ◽  
Connecting Rod ◽  
Adams Software ◽  
Piston Mechanism ◽  
Working Principle ◽  
Vibration Mechanism ◽  
Ansys Workbench

In order to design a kind of mechanical vibration part with stable motion in ultrasonic composite vibration polishing equipment. firstly, the main working principle of ultrasonic composite vibration polishing equipment is briefly introduced. Secondly, the mechanical vibration structure of the design is analyzed theoretically, again, using ADAMS software to simulate the crankshaft connecting rod piston mechanism. When the crankshaft speed is 750r/min, the stroke of the piston is 90mm, which is similar to the theoretical analysis value. Finally, using ANSYS Workbench software to analyze the crankshaft statics. The analysis shows that the design of the mechanical vibration structure is reasonable, which provides a theoretical basis for the study of the mechanical vibration structure of ultrasonic composite vibration polishing equipment.

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