Analysis of Flow Simulation Based on Particle Movement

2011 ◽  
Vol 204-210 ◽  
pp. 453-457
Author(s):  
Zhen Yu Zhong
Keyword(s):  
Flow Field ◽  
Multiphase Flow ◽  
Fluid Structure Interaction ◽  
Flow Simulation ◽  
Calculation Error ◽  
Particle Movement ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Simulation Based

It is proposed the method based on particle movement to simulate flow in this paper. The force on particles can be obtained from N-S equations, and the calculation error caused by particles’ simulation is discussed. Results show that the method is more effective through the example of flow field affected by the cube. The advantage of this method is to solve problems of multiphase flow and fluid-structure interaction.

Predicting Erosion-Corrosion Induced by the Interactions Between Multiphase Flow and Structure in Piping System

2009 ◽  
Vol 131 (6) ◽  
Author(s):  
P. Tang ◽  
J. Yang ◽  
J. Y. Zheng ◽  
C. K. Lam ◽  
I. Wong ◽  
...  
Keyword(s):  
Multiphase Flow ◽  
Fluid Structure Interaction ◽  
Flow Simulation ◽  
Electrochemical Corrosion ◽  
Piping System ◽  
Protective Film ◽  
Critical Position ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Erosion Corrosion

Erosion-corrosion failures frequently found in piping systems can lead to the leakage of pipes, or even damage of the whole system. Erosion-corrosion is a form of material degradation that involves electrochemical corrosion and mechanical wear processes encountered on the surface of metal pipes. Fluid-structure interactions have a profound influence on such erosion-corrosion phenomena. This paper is focused on the multiphase flow-induced erosion-corrosion phenomena in pipes, with multiscale analysis, to study the interactions between the flow and the protective film inside the piping system. The shear stress and the pressure of the flow in a pipe with a step were first obtained using a multiphase flow dynamic analysis. The erosion-corrosion rules of the pipes under the multiphase flow were then summarized. Using the microscale flow simulation method, the fluid-structure interaction between the flow and the protective film at the critical position was modeled. The deformation of the protective films was shown to vary with the flow velocity and the corresponding flow regime. According to the simulation results of the fluid-structure interaction, the location, rate, and extent of the erosion-corrosion on pipe surfaces can be predicted. The prediction was also proven by actual instances. Moreover, the method can be used in optimizing the design of the inner sleeves of pipes.

Fluid-Structure Interaction Modeling of Spacecraft Parachutes for Simulation-Based Design

2011 ◽  
Vol 79 (1) ◽  
Author(s):  
Kenji Takizawa ◽  
Timothy Spielman ◽  
Creighton Moorman ◽  
Tayfun E. Tezduyar
Keyword(s):  
Computer Modeling ◽  
Fluid Structure Interaction ◽  
Flow Simulation ◽  
Control Line ◽  
Fluid Structure ◽  
Analysis And Design ◽  
Structure Interaction ◽  
Simulation Based Design ◽  
Simulation Based ◽  
Spacecraft Parachutes

Even though computer modeling of spacecraft parachutes involves a number of numerical challenges, advanced techniques developed in recent years for fluid-structure interaction (FSI) modeling in general and for parachute FSI modeling specifically have made simulation-based design studies possible. In this paper we focus on such studies for a single main parachute to be used with the Orion spacecraft. Although these large parachutes are typically used in clusters of two or three parachutes, studies for a single parachute can still provide valuable information for performance analysis and design and can be rather extensive. The major challenges in computer modeling of a single spacecraft parachute are the FSI between the air and the parachute canopy and the geometric complexities created by the construction of the parachute from “rings” and “sails” with hundreds of gaps and slits. The Team for Advanced Flow Simulation and Modeling has successfully addressed the computational challenges related to the FSI and geometric complexities, and has also been devising special procedures as needed for specific design parameter studies. In this paper we present parametric studies based on the suspension line length, canopy loading, and the length of the overinflation control line.

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.

Fluid-Structure Interaction Modeling of a Subsea Jumper Pipe

2014 ◽  
Author(s):  
Mohammad A. Elyyan ◽  
Yeong-Yan Perng ◽  
Mai Doan
Keyword(s):  
Multiphase Flow ◽  
Numerical Simulations ◽  
Numerical Study ◽  
Fluid Structure Interaction ◽  
Flow Experience ◽  
Flow Induced Vibration ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Start Up ◽  
Interaction Modeling

Flow-induced vibration (FIV) is one of the main reasons for subsea piping failure, where subsea pipes, which typically carry multiphase flow, experience large fluctuating forces. These fluctuating forces can induce severe vibrations leading to premature piping failure. This paper presents a transient numerical study of a typical subsea M-shape jumper pipe that is carrying a gas-liquid multiphase flow subject to a slug frequency of 4.4 Hz, starting from rest to include the start-up effect as part of the study. 3-D numerical simulations were used to capture the fluid-structure interaction (FSI) and estimate pipe deformations due to fluctuating hydrodynamic forces. In this paper, two FSI approaches were used to compute the pipe deformations, two-way coupled and one-way decoupled. Analysis of the results showed that decoupled (one-way) FSI approach overestimated the peak pipe deformation by about 100%, and showed faster decay of fluctuations than coupled (two-way) FSI analysis. The assessment of resonant risk due to FIV is also discussed.

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