Application of Arbitrary Lagrange Euler Formulations to Flow-Induced Vibration Problems

2002 ◽  
Author(s):  
Z. Bendjeddou ◽  
E. Longatte ◽  
M. Souli
Keyword(s):  
Flow Induced Vibration ◽  
Vibration Problems

Prevention and Cure of Flow-Induced Vibration Problems in Tubular Heat Exchangers

1980 ◽  
Vol 102 (2) ◽  
pp. 138-145 ◽  
Author(s):  
F. L. Eisinger
Keyword(s):  
Heat Exchangers ◽  
Cross Flow ◽  
Acoustic Vibration ◽  
New Method ◽  
Flow Induced Vibration ◽  
Tube Bank ◽  
Vibration Resistance ◽  
Stability Diagrams ◽  
Vibration Problems ◽  
Prevention And Cure

Various methods for predicting and solving tube and acoustic vibration problems in heat exchangers in cross flow are presented: the use of stability diagrams comprising in-service experience of heat exchangers, for a general multispan tube model; a method of selecting efficient baffle configurations for prevention of acoustic vibration, a new method of fin barriers, an alternative to conventional baffling; a new method of enhancing the vibration resistance of a tube bank based on the use of a helical spacer; these methods, singly or in combination, can be used to design against flow-induced vibration.

Mesh Shape Preservation for Flow-Induced Vibration Problems

2002 ◽  
Author(s):  
R. M. C. So ◽  
Y. Liu ◽  
Y. G. Lai
Keyword(s):  
Numerical Technique ◽  
Three Dimensional ◽  
Cross Flow ◽  
Physical Space ◽  
Shape Preservation ◽  
Structural Vibration ◽  
Flow Induced Vibration ◽  
Time Step ◽  
Dimensional Flow ◽  
Vibration Problems

This paper describes a numerical technique that can prevent the mesh from severe distortion in flow-induced vibration calculations. An orthogonal transformed space that is related to the physical space through a Laplacian equation is introduced. At each time step, the mesh may deform significantly in the physical space due to structural vibration, but the mesh nodal value in the transformed space remains constant. As long as the coordinates in the physical space can be adjusted to render the transformed space independent of time, the mesh shape in the physical space is preserved, even though the mesh area may enlarge or reduce significantly. For simplicity, a two-dimensional flow-induced vibration problem is used to illustrate this method. Two side-by-side elastic cylinders in a cross flow are considered. The Reynolds number is fixed at 200 so that a laminar wake is still available. The mass ratio is chosen to be small so that large displacements of the cylinders can be realized. The predictions with and without mesh preservation are compared. The difference between the two results could be as large as 25% in the prediction of the mean transverse displacements of the cylinders. The method could be extended to three-dimensional flow-induced vibration problems without much difficulty.

Numerical Simulation of Dynamic Instability for a Pipe Conveying Fluid

2006 ◽  
Author(s):  
Fabien Huvelin ◽  
Elisabeth Longatte ◽  
Vale´rie Verreman ◽  
M’hamed Souli
Keyword(s):  
Dynamic Instability ◽  
Test Case ◽  
Pipe Conveying Fluid ◽  
Flow Induced Vibration ◽  
Mesh Motion ◽  
Structure Interaction ◽  
Ale Formulation ◽  
Vibration Problems ◽  
Grid Interpolation ◽  
Conveying Fluid

The present work is devoted to simulation of fluid-structure interaction and flow-induced vibration problems by using a partitioned procedure. A finite element structure solver is coupled with a finite volume fluid solver. A coupling interface has been developed for grid interpolation and scheme coupling control. An alternative mesh motion to a classical ALE formulation is proposed for the fluid computation and the method is validated by means of a test-case involving a pipe conveying fluid.

Application of Arbitrary Lagrange Euler Formulations to Flow-Induced Vibration Problems

2003 ◽  
Vol 125 (4) ◽  
pp. 411-417 ◽  
Author(s):  
E. Longatte ◽  
Z. Bendjeddou ◽  
M. Souli
Keyword(s):  
Fluid Dynamics ◽  
Experimental Data ◽  
Tube Bundle ◽  
Numerical Results ◽  
Generation Process ◽  
Flow Induced Vibration ◽  
Local Flow ◽  
Classical Fluid ◽  
Elastic Forces ◽  
Vibration Problems

Most classical fluid force identification methods rely on mechanical structure response measurements associated with convenient data processes providing turbulent and fluid-elastic forces responsible for possible vibrations and damage. These techniques provide good results; however, they often involve high costs as they rely on specific modelings fitted with experimental data. Owing to recent improvements in computational fluid dynamics, numerical simulation of flow-induced structure vibration problems is now practicable for industrial purposes. As far as flow structure interactions are concerned, the main difficulty consists in estimating numerically fluid-elastic forces acting on mechanical components submitted to turbulent flows. The point is to take into account both fluid effects on structure motion and conversely dynamic motion effects on local flow patterns. This requires a code coupling to solve fluid and structure problems in the same time. This ability is out of limit of most classical fluid dynamics codes. That is the reason why recently an improved numerical approach has been developed and applied to the fully numerical prediction of a flexible tube dynamic response belonging to a fixed tube bundle submitted to cross flows. The methodology consists in simulating at the same time thermo-hydraulics and mechanics problems by using an Arbitrary Lagrange Euler (ALE) formulation for the fluid computation. Numerical results turn out to be consistent with available experimental data and calculations tend to show that it is now possible to simulate numerically tube bundle vibrations in presence of cross flows. Thus a new possible application for ALE methods is the prediction of flow-induced vibration problems. The full computational process is described in the first section. Classical and improved ALE formulations are presented in the second part. Main numerical results are compared to available experimental data in section 3. Code performances are pointed out in terms of mesh generation process and code coupling method.

Flow-Induced Vibration: Guidelines for Design, Diagnosis, and Troubleshooting of Common Power Plant Components

1985 ◽  
Vol 107 (4) ◽  
pp. 326-334 ◽  
Author(s):  
M. K. Au-Yang
Keyword(s):  
Power Plant ◽  
Vortex Shedding ◽  
Cylindrical Shells ◽  
Leakage Flow ◽  
Flat Plates ◽  
Flow Induced Vibration ◽  
Flowing Fluid ◽  
Vibration Problems ◽  
Tube Banks ◽  
Plant Components

The different techniques of assessing the flow-induced vibration problems of common power plant components are reviewed. The components are divided into categories of single cylinders, flat plates, pipes containing flowing fluid, cylindrical shells, and tube banks. The mechanisms considered include turbulent buffeting, instability, vortex shedding, acoustics, and leakage flow-induced vibration. Emphasis is placed on applications to industrial problems.

Sign in / Sign up

Export Citation Format

Share Document