نتایج جستجو برای: von karman equations

تعداد نتایج: 334341  

Journal: :IEEE Journal of Oceanic Engineering 1989

Journal: :Mathematics 2022

The nonlinear bending of the sandwich plates with graphene nanoplatelets (GPLs) reinforced porous composite (GNRPC) core and two metal skins subjected to different boundary conditions various loads, such as concentrated load at center, linear loads slopes passing through eccentric uniform trapezoidal has been presented. popular four-unknown refined theory accounting for thickness stretching eff...

2012
J. Bilong E. Ngo Nyobe J. Hona

Using the geometrical optics approximation, a theoretical prediction of the deflection angle correlation of a laser beam propagating in a hot turbulent jet is found as a functional form of the turbulent spectrum of the refractive index fluctuations. By applying the modified Von Karman model and Tatarskii model, the structure coefficient of the refractive index and the deflection angle correlati...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2007
F De Lillo Bruno Eckhardt

We simulate turbulence in a plane Couette geometry by a spectral method intermediate between full resolution and the complete elimination of small modes common in large eddy simulations. The wave number grid is sparse in spanwise and downstream direction, with a total number of modes proportional to Re(3/4) lnRe. At a Reynolds number of 2000 we could suppress more than 80% of the modes and stil...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2009
Antonio Siber Rudolf Podgornik

We discuss the stability of icosadeltahedral shells subjected to a uniform external load in the form of an isotropic pressure. We demonstrate that there exists a universal critical buckling pressure scaling form that defines a locus of buckling instabilities. The parameter that uniquely determines this scaling form is shown to be the Föppl-von Karman number of nonpressurized shells. Numerical r...

2005
S. H. Im R. Huang

This paper develops a model for evolving wrinkles in a bilayer thin film consisting of an elastic layer and a viscoelastic layer. The elastic layer is subjected to a compressive residual stress and is modeled by the nonlinear von Karman plate theory. A thin-layer approximation is developed for the viscoelastic layer. The stability of the bilayer and the evolution of wrinkles are studied first b...

Journal: :Journal of the Optical Society of America. A, Optics, image science, and vision 2007
Greg Gbur Olga Korotkova

An angular spectrum representation is applied for a description of statistical properties of arbitrary beamlike fields propagating through atmospheric turbulence. The Rytov theory is used for the characterization of the perturbation of the field by the atmosphere. In particular, we derive expressions for the cross-spectral density of a coherent and a partially coherent beam of arbitrary type in...

1999
Gregory L. Eyink

It has been generally assumed, since the work of von Karman and Howarth in 1938, that free decay of fully-developed turbulence is self-similar. We present here a simple phenomenological model of the decay of 3D incompressible turbulence, which predicts breakdown of self-similarity for low-wavenumber spectral exponents n in the range nc < n < 4, where nc is some threshold wavenumber. Calculation...

Journal: : 2023

This paper presents an analytical investigation of the nonlinear vibration characteristics a single-phase functionally graded cylindrical shell panel with various porous metal cores. Porous constructions varying degrees porosity throughout their volume are known as materials (FGMs). These have wide range applications across several industries, including shipbuilding, automotive, biomedical, mar...

2008
K. F. KARLSSON

A von Karman vortex street generated in the usual way was subjected to a deceleration, thereby changing the ratio of longitudinal to lateral spacing between the vortices. Distortion of the individual vortices followed which resulted in annihilation of concentrated vortex regions and creation of a stationary wake flow. This wake flow was itself dynamically unstable and developed into a new vorte...

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