Small amplitude oscillations of a shape-morphing plate immersed in a viscous fluid near a solid wall

2018 ◽  
Vol 124 (13) ◽  
pp. 134502 ◽  
Author(s):  
Syed N. Ahsan ◽  
Matteo Aureli
Keyword(s):  
Viscous Fluid ◽  
Small Amplitude ◽  
Solid Wall ◽  
Shape Morphing

On a sphere performing linear and torsional oscillations in a viscous fluid

1988 ◽  
Vol 66 (7) ◽  
pp. 576-579
Author(s):  
G. T. Karahalios ◽  
C. Sfetsos
Keyword(s):  
Boundary Layer ◽  
Viscous Fluid ◽  
Secondary Flow ◽  
Small Amplitude ◽  
Equations Of Motion ◽  
Successive Approximations ◽  
Method Of Successive Approximations ◽  
Time Varying ◽  
Torsional Oscillations

A sphere executes small-amplitude linear and torsional oscillations in a fluid at rest. The equations of motion of the fluid are solved by the method of successive approximations. Outside the boundary layer, a steady secondary flow is induced in addition to the time-varying motion.

Stability of a plane jet of a highly viscous fluid impinging on a horizontal solid wall

2011 ◽  
Vol 46 (1) ◽  
pp. 44-50 ◽  
Author(s):  
M. A. Ponomareva ◽  
G. R. Shrager ◽  
V. A. Yakutenok
Keyword(s):  
Viscous Fluid ◽  
Solid Wall ◽  
Plane Jet

Small amplitude oscillations of a thin beam immersed in a viscous fluid near a solid surface

2005 ◽  
Vol 17 (7) ◽  
pp. 073102 ◽  
Author(s):  
Christopher P. Green ◽  
John E. Sader
Keyword(s):  
Viscous Fluid ◽  
Solid Surface ◽  
Small Amplitude ◽  
Thin Beam

Simulation of Particle-Wall Collisions in a Viscous Fluid Using a Resolved Discrete Particle Method

2010 ◽  
Author(s):  
Zhi-Gang Feng ◽  
Efstathis E. Michaelides ◽  
Shaolin Mao
Keyword(s):  
Viscous Fluid ◽  
Numerical Method ◽  
Solid Wall ◽  
Particle Method ◽  
Solid Particles ◽  
Force Density ◽  
Model Parameters ◽  
Discrete Particle ◽  
Soft Sphere ◽  
Discrete Particle Method

The process of particle-wall collisions is very important in understanding and determining the fluid-particle behavior, especially near walls. Detailed information on particle-wall collisions can provide insight on the formulation of appropriate boundary conditions of the particulate phases in two-fluid models. We have developed a three-dimensional Resolved Discrete Particle Method (RDPM) that is capable of meaningfully handling particle-wall collisions in a viscous fluid. This numerical method makes use of a Finite-Difference method in combination with the Immersed Boundary (IB) method for treating the particulate phase. A regular Eulerian grid is used to solve the modified momentum equations in the entire flow region. In the region that is occupied by the solid particles, a second particle-based Lagrangian grid is used, and a force density function is introduced to represent the momentum interactions between particle and fluid. We have used this numerical method to study both the central and oblique impact of a spherical particle with a wall in a viscous fluid. The particles are allowed to move in the fluid until they collide with the solid wall. The collision force on the particle is modeled by a soft-sphere collision scheme with a linear spring-dashpot system. The hydrodynamic force on the particle is solved directly from the RDPM. By following the trajectories of a particle, we investigate the effect of the collision model parameters to the dynamics of a particle close to the wall. We report in this paper the rebound velocity of the particle, the coefficient of restitution, and the particle slip velocity at the wall when a variety of different soft-sphere collision parameters are used.

Lateral Vibrations of a Rotating Shaft in a Viscous Fluid

1969 ◽  
Vol 36 (4) ◽  
pp. 682-686 ◽  
Author(s):  
Chang-Yi Wang
Keyword(s):  
Viscous Fluid ◽  
Small Amplitude ◽  
Normal Force ◽  
Rotating Shaft ◽  
Steady Streaming ◽  
Fast Rotation ◽  
Lateral Vibrations ◽  
Cylindrical Shaft

A rigid rotating cylindrical shaft is vibrating along a diameter in a viscous fluid. Two different cases are investigated through the method of inner and outer expansions. The case of small amplitude vibrations is characterized by the diffusion of vorticity. The coupling of rotation with vibration introduces a normal force, of both inviscid and viscous origins, perpendicular to the direction of oscillation. As rotation increases, the induced steady streaming becomes more skewed and weaker. The case of fast rotation is characterized by the transport of vorticity. Rotation affects both the drag and normal force. The steady torque is increased due to the induction of a steady secondary rotary flow.

On flow visualization using reflective flakes

1985 ◽  
Vol 152 ◽  
pp. 235-248 ◽  
Author(s):  
Ö. Savaş
Keyword(s):  
Wave Packet ◽  
Viscous Fluid ◽  
Flow Visualization ◽  
Small Amplitude ◽  
Rotating Disk ◽  
Turbulent Spot ◽  
Rational Analysis ◽  
Ellipsoidal Particles ◽  
Parallel Flows ◽  
Tollmien Schlichting

An analysis of flow visualization using small reflective flakes is introduced. This rational analysis is based on a stochastic treatment of Jeffery's (1922) solution for the motion of ellipsoidal particles in a viscous fluid, wherein thin flakes tend to align with stream surfaces. The predicted light fields are confirmed by examples of parallel flows, the flow over a rotating disk, and the spinup from rest in a cylindrical cavity. The Tollmien–Schlichting wave packet trailing a turbulent spot is taken as an example to discuss the suitability of the technique for visualizing small-amplitude waves. Attenuation of light through a suspension is described.

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