Negative Wake and Velocity of a Bubble Rising in a Viscoelastic Fluid

Bubble Rising ◽

A three-dimensional finite element based numerical method is used to simulate the rise of a bubble in a viscoelastic fluid modeled by the Oldroyd-B model. The rise velocity is studied as a function of the bubble volume on a log-log plot. The dependence of rise velocity on the bubble shape and the viscoelastic properties of the ambient fluid are also investigated. In simulations, rather than a jump in the rise velocity at a critical volume as observed in experiments, we find that there is a steep, but continuous, change in the rise velocity over a very small range of bubble volumes. Interestingly, this steep increase in the rise velocity is exaggerated when a parameter, which is a measure of the polymer concentration, is increased, while keeping the zeroshear viscosity fixed. The wake is ‘negative’ in the sense that the direction of fluid velocity behind the bubble for this parameter range is the opposite of that for a Newtonian fluid.

Volume 1: 20th Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C ◽

Hydroelasticity Vibration of a Rectangular Tank Wall

10.1115/detc2005-84222 ◽

2005 ◽

Author(s):

K. S. Kim ◽

D. W. Kim ◽

Y. B. Lee ◽

S. H. Choi ◽

Y. S. Kim

Keyword(s):

Fluid Velocity ◽

Three Dimensional ◽

Tank Wall ◽

Finite Element Program ◽

Assumed Mode Method ◽

Rectangular Tank ◽

Mode Method ◽

Element Program ◽

A theoretical study is carried out on the hydroelasticity vibration of a rectangular tank wall. It is assumed that the tank wall is clamped along the plate edges. The fluid velocity potential is used for the simulation of fluid domain and to obtain the added mass due to wall vibration. In addition, the vibration characteristics of stiffened wall of the rectangular tank are investigated. Assumed mode method is utilized to the stiffened plate model and hydrodynamic force is obtained by the proposed approach. The coupled natural frequencies are obtained from the relationship between kinetic energies of a wall including fluid and the potential energy of the wall. The proposed analytical approach was found to be in good agreement with the results of a well-known commercial three-dimensional finite element program.

Stress and Strain Distribution Patterns in Bone around Tissue- and Bone-Level Implant-Supported Mandibular Overdentures Using Three-Dimensional Finite-Element Analysis

Journal of Long-Term Effects of Medical Implants ◽

10.1615/jlongtermeffmedimplants.2019031747 ◽

2019 ◽

Vol 29 (3) ◽

pp. 175-181

Author(s):

Farhad Hajizadeh ◽

Sanaz Panahi

Keyword(s):

Finite Element Analysis ◽

Strain Distribution ◽

Three Dimensional ◽

Distribution Patterns ◽

Stress And Strain ◽

Element Analysis ◽

Bone Level ◽

Three Dimensional Finite Element ◽

Stress And Strain Distribution

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

Tire Science and Technology ◽

10.2346/1.2768607 ◽

2007 ◽

Vol 35 (3) ◽

pp. 226-238 ◽

Cited By ~ 1

Author(s):

K. M. Jeong ◽

K. W. Kim ◽

H. G. Beom ◽

J. U. Park

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Three Dimensional ◽

Element Model ◽

Radial Force ◽

Element Analysis ◽

The Finite Element Analysis ◽

Force Variation ◽

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

Tire Modeling by Finite Elements

Tire Science and Technology ◽

10.2346/1.2139507 ◽

1992 ◽

Vol 20 (1) ◽

pp. 33-56 ◽

Cited By ~ 27

Author(s):

L. O. Faria ◽

J. T. Oden ◽

B. Yavari ◽

W. W. Tworzydlo ◽

J. M. Bass ◽

...

Keyword(s):

Three Dimensional ◽

Rolling Contact ◽

Test Problems ◽

State Behavior ◽

Normal Contact ◽

New Developments ◽

Applied Torque ◽

Tire Modeling ◽

Abstract Recent advances in the development of a general three-dimensional finite element methodology for modeling large deformation steady state behavior of tire structures is presented. The new developments outlined here include the extension of the material modeling capabilities to include viscoelastic materials and a generalization of the formulation of the rolling contact problem to include special nonlinear constraints. These constraints include normal contact load, applied torque, and constant pressure-volume. Several new test problems and examples of tire analysis are presented.