NDLI: Numerical Simulations of Vortex-Induced Vibration of Flexible Cylinders

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Cassio, T. Yamamoto Rodrigo, A. Fregonesi Julio, R. Meneghini Saltara, Fabio Ferrari, Jose´ A.
Copyright Year	2002
Abstract	The main purpose of this paper is to acquire a better understanding of the hydroelastic interactions, which take place between oscillating flexible cylinders and fluid forces. The cylinders are subjected to currents and shear flow, and the hydrodynamic forces are estimated by CFD tools. This article presents the results of an investigation being carried out at the University of Sa˜o Paulo, in which a discrete vortex method is used to simulate the flow around a flexible cylinder. The calculations are compared with results obtained employing the quasi-steady theory, as proposed by Ferrari [2]. Also, the calculations are compared with experiments of a cantilever flexible cylinder immersed in a current, see Fujarra [6]. The reduced velocity vs. non-dimensional amplitude curve obtained in our calculations is compared with the experimental results. Visualizations of the wake indicate a hybrid mode of vortex shedding along the span. A 2S mode is found in regions of low amplitudes, changing to a 2P mode in the regions of larger amplitudes. The position of the transition of the modes varies with the reduced velocity. Our intention is to apply this model to problems occurring in the offshore industry. In this industry fluids are conveyed from the seabed to the platform through slender structures called risers. These risers are subject to shear and oscillatory flows due to currents and waves, respectively, flows with a very high degree of complexity, with changes of intensity and direction the deeper the water depth. A finite element structural model based on the Euler-Bernoulli beam theory was developed. In order to evaluate the dynamic response, a general equation of motion is solved through a numerical integration scheme in the time domain. The hydrodynamic forces are evaluated in two-dimensional strips. The technique used is the Discrete Vortex Method, which is a Lagrangian numerical scheme to simulate an incompressible and viscous fluid flow. A practical case of marine risers is also presented. In this case the results for various uniform currents acting on a single, flexible cylinder, representing a riser of 120m with 100m under water, are shown. Envelopes of maximum and minimum in-line and transverse displacements are presented. There is also a comparison of a shear flow case between the CFD numerical code with the quasi-steady theory code developed by Ferrari [2].
Sponsorship	Applied Mechanics Division
Starting Page	445
Ending Page	453
Page Count	9
File Format	PDF
ISBN	0791836592
DOI	10.1115/IMECE2002-39042
Volume Number	5th International Symposium on Fluid Structure Interaction, Aeroelasticity, and Flow Induced Vibration and Noise
Conference Proceedings	ASME 2002 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2002-11-17
Publisher Place	New Orleans, Louisiana, USA
Access Restriction	Subscribed
Subject Keyword	Water Strips Visualization Shear flow Marine drilling risers Fluid-dynamic forces Waves Cantilevers Fluids Wakes Currents Risers (casting) Cylinders Dynamic response Vortex shedding Euler-bernoulli beam theory Computer simulation Computational fluid dynamics Fluid dynamics Equations of motion Flow (dynamics) Seabed Vortex-induced vibration Pipeline risers Vortices Ocean engineering Finite element analysis Shear (mechanics)
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Numerical Simulations of the Flow Around Flexible Cylinders

A Time Domain Prediction Method for Vortex-Induced Vibrations of a Flexible Pipe With Time-Varying Tension

Wake Fields Behind Risers Undergoing Vortex-Induced Vibration

Vortex-Induced Vibration of a Variable Tension Riser

Numerical Modeling of Vortex-Induced Vibrations of Two Flexible Risers

Hydrodynamic Coefficients for Straked Risers

Simulations on Hydrodynamic Coefficients of Stationary Cactus-Shaped Cylinders at a Low Reynolds Number

Numerical Simulation of Vortex Induced Vibrations for Marine Risers Subjected to Sheared Flow

On Determination of VIV Coefficients Under Shear Flow Condition

Numerical Simulations of Vortex-Induced Vibration of Flexible Cylinders

Similar Documents

Numerical Simulations of the Flow Around Flexible Cylinders

A Time Domain Prediction Method for Vortex-Induced Vibrations of a Flexible Pipe With Time-Varying Tension

Wake Fields Behind Risers Undergoing Vortex-Induced Vibration

Vortex-Induced Vibration of a Variable Tension Riser

Numerical Modeling of Vortex-Induced Vibrations of Two Flexible Risers

Hydrodynamic Coefficients for Straked Risers

Simulations on Hydrodynamic Coefficients of Stationary Cactus-Shaped Cylinders at a Low Reynolds Number

Numerical Simulation of Vortex Induced Vibrations for Marine Risers Subjected to Sheared Flow

On Determination of VIV Coefficients Under Shear Flow Condition

Numerical Simulations of Vortex-Induced Vibration of Flexible Cylinders