Extended Hamilton’s Principle for Fluid-Structure Interaction

2003 ◽  
Author(s):  
Haym Benaroya ◽  
Timothy Wei
Keyword(s):  
Vortex Shedding ◽  
Bluff Body ◽  
Fluid Structure Interaction ◽  
Flow Characteristics ◽  
Extensive Literature ◽  
Bluff Bodies ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Extended Hamilton’S Principle ◽  
The Subject

The problem of vortex-shedding from bluff bodies has been examined for over a century, as reflected by the extensive literature on the subject. The focus of these foregoing researches can be split into two broad categories: investigations into the flow characteristics around a body in a flow, and studies of the response of a bluff body to the forces from the flow.

3-D Dynamic Simulation on Fluid-Structure Interaction of Air Flowing Around Prism

2014 ◽  
Author(s):  
Junlei Wang ◽  
JingYu Ran ◽  
Lin Ding ◽  
Li Zhang
Keyword(s):  
Lead Zirconate Titanate ◽  
Bluff Body ◽  
Fluid Structure Interaction ◽  
Wind Tunnel Test ◽  
Lead Zirconate ◽  
Bluff Bodies ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Fluid Field ◽  
Wind Induced Vibration

In this paper, a new method of generating power by “wind-induced vibration” (WIV). A lead zirconate titanate (PZT) beam which has a very high power density is installed on the bluff body which will have WIV with the bluff body has been explored. Both numerical computation and experimental work have been taken to measure the capacity of the power generating system. Two different shapes of bluff bodies have been tested. In numerical section, the lift and drag coefficient and the vortex shedding frequency have been computed to verify how the dimensionless parameter Vr affects the fluid field. An one-degree-freedom system has been added to describe the wind-induced vibration, and the vibrational frequency and amplitude of the vibration have been monitored. The fluid-structure interaction has been solved by a hybrid method of finite volume method (FVM) and finite element method (FEM). From numerical simulation, the conclusions can be given that as the non-dimensionalised mass m* is about 780, the vortex induced vibration (VIV) response of a single cylinder is quite different comparing with Govardhan&Williamson. Then a wind tunnel test has been taken to measure the voltage output of the PZT, and we have gotten a result quite close to the data of numerical method.

On a Partitioned Strong Coupling Algorithm for Modeling Fluid–Structure Interaction

2015 ◽  
Vol 07 (02) ◽  
pp. 1550021 ◽  
Author(s):  
Tao He
Keyword(s):  
Finite Element ◽  
Strong Coupling ◽  
Bluff Body ◽  
Stokes Equations ◽  
Fluid Structure Interaction ◽  
Structural Equations ◽  
Mass Source ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Coupling Algorithm

This paper presents a partitioned strong coupling algorithm for fluid–structure interaction in the arbitrary Lagrangian–Eulerian finite element framework. The incompressible Navier–Stokes equations are solved by the semi-implicit characteristic-based split (CBS) scheme while the structural equations are temporally advanced by the Bathe method. The celled-based smoothed finite element method is adopted for the solution of a geometrically nonlinear solid. To update the dynamic mesh, the moving submesh approach is performed in conjunction with the ortho-semi-torsional spring analogy method. A mass source term is implanted into the pressure Poisson equation to respect the geometric conservation law for the fractional-step-type CBS fluid solver. The iterative solution is achieved by fixed-point method with Aitken's Δ2 accelerator. The proposed methodology is validated against flow-induced oscillations of a bluff body and a flexible body. The overall numerical results agree well with the available data. Some important flow phenomena have been disclosed successfully.

scholarly journals Inhalation Induced Stresses and Flow Characteristics in Human Airways through Fluid-Structure Interaction Analysis

2008 ◽  
Vol 2008 ◽  
pp. 1-8 ◽  
Author(s):  
Kittisak Koombua ◽  
Ramana M. Pidaparti
Keyword(s):  
Computational Model ◽  
Interaction Analysis ◽  
Airway Remodeling ◽  
Fluid Structure Interaction ◽  
Flow Characteristics ◽  
Fluid Structure ◽  
Tissue Properties ◽  
Structure Interaction ◽  
Simulation Results ◽  
Human Airways

Better understanding of stresses and flow characteristics in the human airways is very important for many clinical applications such as aerosol drug therapy, inhalation toxicology, and airway remodeling process. The bifurcation geometry of airway generations 3 to 5 based on the ICRP tracheobronchial model was chosen to analyze the flow characteristics and stresses during inhalation. A computational model was developed to investigate the airway tissue flexibility effect on stresses and flow characteristics in the airways. The finite-element method with the fluid-structure interaction analysis was employed to investigate the transient responses of the flow characteristics and stresses in the airways during inhalation. The simulation results showed that tissue flexibility affected the maximum airflow velocity, airway pressure, and wall shear stress about 2%, 7%, and 6%, respectively. The simulation results also showed that the differences between the orthotropic and isotropic material models on the airway stresses were in the ranges of 25–52%. The results from the present study suggest that it is very important to incorporate the orthotropic tissue properties into a computational model for studying flow characteristics and stresses in the airways.

scholarly journals FLUID-STRUCTURE INTERACTION ANALYSIS APPLIED TO OIL CONTAINMENT BOOMS

2005 ◽  
Vol 2005 (1) ◽  
pp. 585-588 ◽  
Author(s):  
Azin Amini ◽  
Maziar Mahzari ◽  
Erik Bollaert ◽  
Anton Schleiss
Keyword(s):  
Interaction Analysis ◽  
Fluid Structure Interaction ◽  
Flow Characteristics ◽  
Two Phase ◽  
Ongoing Research ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Oil Slick ◽  
Flexible Barrier ◽  
Waves And Currents

ABSTRACT The most important aspect of the ongoing research project is to develop numerical coupled hydraulic-structural analysis models of oil containment booms. This should be later applicable for investigation of the efficiency limits of a new system of oil spill containment booms called Cavalli system. This system consists of surrounding the oil slick with a special boom and protecting it against waves and currents. It provides the possibility to divide the encircled area in several smaller circles and to increase the thickness of the oil slick inside. The whole system consists of a two-phase fluid (oil and water) and a boom that should be structurally stable for the pressure loads imposed by the fluids. It is finally important to evaluate the behaviour of the flexible skirt under different wave and current conditions, as almost all of existing research in the field have been undertaken for rigid barriers. To assess the behaviour of a flexible barrier fluid-structure interaction analysis is to be conducted. The problem is considered as a fluid-structure interaction problem as the boom usually undergoes large deformations and rotations, which modifies the flow characteristics during operation that is not the case for a rigid boom.

Wake Interaction Using Lattice Boltzmann Method

2018 ◽  
pp. 223-261
Author(s):  
K. Karthik Selva Kumar ◽  
L. A. Kumaraswamidhas
Keyword(s):  
Fluid Flow ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Computational Simulation ◽  
Fluid Structure Interaction ◽  
Flow Characteristics ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Fluid Flow Characteristics ◽  
Boltzmann Method

In this chapter, a brief discussion about the application of lattice Boltzmann method on complex flow characteristics over circular structures is presented. A two-dimensional computational simulation is performed to study the fluid flow characteristics by employing the lattice Boltzmann method (LBM) with respect to Bhatnagar-Gross-Krook (BGK) collision model to simulate the interaction of fluid flow over the circular cylinders at different spacing conditions. From the results, it is observed that there is no significant interaction between the wakes for the transverse spacing's ratio higher than six times the cylinder diameter. For smaller transverse spacing ratios, the fluid flow regimes were recognized with presence of vortices. Apart from that, the drag coefficient signals are revealed as chaotic, quasi-periodic, and synchronized regimes, which were observed from the results of vortex shedding frequencies and fluid structure interaction frequencies. The strength of the latter frequency depends on spacing between the cylinders; in addition, the frequency observed from the fluid structure interaction is also associated with respect to the change in narrow and wide wakes behind the surface of the cylinder. Further, the St and mean Cd are observed to be increasing with respect to decrease in the transverse spacing ratio.

scholarly journals Fluid structure interaction analysis: vortex shedding induced vibrations

2018 ◽  
Vol 8 ◽  
pp. 422-432 ◽  
Author(s):  
N. Di Domenico ◽  
C. Groth ◽  
A. Wade ◽  
T. Berg ◽  
M.E. Biancolini
Keyword(s):  
Vortex Shedding ◽  
Interaction Analysis ◽  
Fluid Structure Interaction ◽  
Fluid Structure ◽  
Structure Interaction
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