Surface visualization of flexible elastic shells

2019 ◽  
Author(s):  
Marina V. Byrdina ◽  
Mikhail F. Mitsik ◽  
Lema A. Bekmurzaev ◽  
Svetlana V. Rubtsova
Keyword(s):  
Elastic Shells ◽  
Surface Visualization

Experimental Investigation of Boundary Layer Instabilities on the Free Surface of Non-Turbulent Jet

2012 ◽  
Author(s):  
Matthieu A. Andre ◽  
Philippe M. Bardet
Keyword(s):  
Boundary Layer ◽  
Free Surface ◽  
High Speed ◽  
Particle Tracking Velocimetry ◽  
Capillary Waves ◽  
Wave Growth ◽  
Image Velocimetry ◽  
Planar Laser ◽  
Surface Visualization ◽  
The Waves

Shear instabilities induced by the relaxation of laminar boundary layer at the free surface of a high speed liquid jet are investigated experimentally. Physical insights into these instabilities and the resulting capillary wave growth are gained by performing non-intrusive measurements of flow structure in the direct vicinity of the surface. The experimental results are a combination of surface visualization, planar laser induced fluorescence (PLIF), particle image velocimetry (PIV), and particle tracking velocimetry (PTV). They suggest that 2D spanwise vortices in the shear layer play a major role in these instabilities by triggering 2D waves on the free surface as predicted by linear stability analysis. These vortices, however, are found to travel at a different speed than the capillary waves they initially created resulting in interference with the waves and wave growth. A new experimental facility was built; it consists of a 20.3 × 146.mm rectangular water wall jet with Reynolds number based on channel depth between 3.13 × 104 to 1.65 × 105 and 115. to 264. based on boundary layer momentum thickness.

Understanding the echo clues used by dolphins to remotely identify the target characteristics of submerged elastic shells

1996 ◽  
Author(s):  
Guillermo C. Gaunaurd ◽  
Donald Brill ◽  
H. Huang ◽  
Patrick W. Moore ◽  
Hans C. Strifors
Keyword(s):  
Elastic Shells ◽  
Target Characteristics

Surface Visualization at CT Colonography Simulated Colonoscopy: Effect of Varying Field of View and Retrograde View

2007 ◽  
Vol 102 (11) ◽  
pp. 2529-2535 ◽  
Author(s):  
James E. East ◽  
Brian P. Saunders ◽  
David Burling ◽  
Darren Boone ◽  
Steve Halligan ◽  
...  
Keyword(s):  
Ct Colonography ◽  
Field Of View ◽  
Surface Visualization

Problems of Nonlinear Multiple-Mode Vibrations of Thin Elastic Shells of Revolution

2000 ◽  
Author(s):  
Veniamin D. Kubenko ◽  
Piotr S. Kovalchuk
Keyword(s):  
Degrees Of Freedom ◽  
Asymptotic Methods ◽  
Nonlinear Resonance ◽  
Shells Of Revolution ◽  
Elastic Shells ◽  
Resonance Amplitude ◽  
Multiple Degrees Of Freedom ◽  
Free And Forced Vibrations ◽  
Multiple Mode ◽  
Averaged Equations

Abstract A method is suggested for the calculation of nonlinear free and forced vibrations of thin elastic shells of revolution, which are modeled as dynamic systems of multiple degrees of freedom. Cases are investigated in which the shells are characterized by two or more closely-spaced eigenfrequencies. Based on an analysis of averaged equations, obtained by making use of asymptotic methods of nonlinear mechanics, a number of new first integrals is obtained, which state a regular energy exchange among various modes of cylindrical shells under conditions of nonlinear resonance. Amplitude-frequency characteristics of multiple-mode vibrations are obtained for shells subjected to radial oscillating pressure.

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