Far field scattering of Gaussian beam by an infinitely long conducting circular cylinder

2002 ◽  
Author(s):  
Y.A. Badr ◽  
M.S. Aly ◽  
M.F. Hassan ◽  
A.M. Elmahdy ◽  
A.M. Azzam
Keyword(s):  
Circular Cylinder ◽  
Gaussian Beam ◽  
Far Field

scholarly journals FAR FIELD SCATTERING OF GAUSSIAN BEAM BY AN INFINITELY LONG CONDUCTING CIRCULAR CYLINDER

2001 ◽  
Vol 9 (ASAT Conference, 8-10 May 2001) ◽  
pp. 1-16
Author(s):  
AZZAM M. ◽  
BADR A. ◽  
ALY S. ◽  
HASAN F. ◽  
ELMAHDY M.
Keyword(s):  
Circular Cylinder ◽  
Gaussian Beam ◽  
Far Field

scholarly journals The Computation of the Magnitude of the Far Field for an Eccentric Circular Cylinder

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Bülent Yılmaz
Keyword(s):  
Circular Cylinder ◽  
Plane Wave ◽  
Radiation Condition ◽  
Higher Order ◽  
Numerical Results ◽  
Surface Radiation ◽  
Far Field ◽  
Condition Method ◽  
Radiation Conditions

The specific case of scattering of a plane wave by a two-layered penetrable eccentric circular cylinder has been considered and it is about the validity of the on surface radiation condition method and its applications to the scattering of a plane wave by a two-layered penetrable eccentric circular cylinder. The transformation of the problem of scattering by the eccentric circular cylinder to the problem of scattering by the concentric circular cylinder by using higher order radiation conditions, is observed. Numerical results presented the magnitude of the far field.

Steady approach of unsteady low-Reynolds-number flow past two rotating circular cylinders

2013 ◽  
Vol 736 ◽  
pp. 414-443 ◽  
Author(s):  
Y. Ueda ◽  
T. Kida ◽  
M. Iguchi
Keyword(s):  
Reynolds Number ◽  
Circular Cylinder ◽  
Stokes Equations ◽  
Low Reynolds Number ◽  
Vortex Method ◽  
The Self ◽  
Circular Cylinders ◽  
Far Field ◽  
Flow Past ◽  
Low Reynolds

AbstractThe long-time viscous flow about two identical rotating circular cylinders in a side-by-side arrangement is investigated using an adaptive numerical scheme based on the vortex method. The Stokes solution of the steady flow about the two-cylinder cluster produces a uniform stream in the far field, which is the so-called Jeffery’s paradox. The present work first addresses the validation of the vortex method for a low-Reynolds-number computation. The unsteady flow past an abruptly started purely rotating circular cylinder is therefore computed and compared with an exact solution to the Navier–Stokes equations. The steady state is then found to be obtained for $t\gg 1$ with ${\mathit{Re}}_{\omega } {r}^{2} \ll t$, where the characteristic length and velocity are respectively normalized with the radius ${a}_{1} $ of the circular cylinder and the circumferential velocity ${\Omega }_{1} {a}_{1} $. Then, the influence of the Reynolds number ${\mathit{Re}}_{\omega } = { a}_{1}^{2} {\Omega }_{1} / \nu $ about the two-cylinder cluster is investigated in the range $0. 125\leqslant {\mathit{Re}}_{\omega } \leqslant 40$. The convection influence forms a pair of circulations (called self-induced closed streamlines) ahead of the cylinders to alter the symmetry of the streamline whereas the low-Reynolds-number computation (${\mathit{Re}}_{\omega } = 0. 125$) reaches the steady regime in a proper inner domain. The self-induced closed streamline is formed at far field due to the boundary condition being zero at infinity. When the two-cylinder cluster is immersed in a uniform flow, which is equivalent to Jeffery’s solution, the streamline behaves like excellent Jeffery’s flow at ${\mathit{Re}}_{\omega } = 1. 25$ (although the drag force is almost zero). On the other hand, the influence of the gap spacing between the cylinders is also investigated and it is shown that there are two kinds of flow regimes including Jeffery’s flow. At a proper distance from the cylinders, the self-induced far-field velocity, which is almost equivalent to Jeffery’s solution, is successfully observed in a two-cylinder arrangement.

Far-field Gaussian beam shaping under the diffraction limits

2004 ◽  
Author(s):  
Shuyun Teng ◽  
Liren Liu ◽  
Zhu Luan
Keyword(s):  
Gaussian Beam ◽  
Beam Shaping ◽  
Far Field

Scattering Properties of Vectorial Far-Field Laguerre-Gaussian Beam by Single Spherical Particle

2018 ◽  
Vol 45 (6) ◽  
pp. 0605003
Author(s):  
徐强 Xu Qiang ◽  
李金刚 Li Jingang ◽  
王旭 Wang Xu ◽  
韩一平 Han Yiping ◽  
吴振森 Wu Zhensen
Keyword(s):  
Gaussian Beam ◽  
Spherical Particle ◽  
Far Field

Far-field Divergence for Collimated Gaussian Beam Diffracted by a Circular Aperture

2015 ◽  
Vol 44 (11) ◽  
pp. 1105001
Author(s):  
王超 WANG Chao ◽  
江伦 JIANG Lun ◽  
董科研 DONG Ke-yan ◽  
安岩 AN Yan ◽  
姜会林 JIANG Hui-lin
Keyword(s):  
Gaussian Beam ◽  
Far Field ◽  
Circular Aperture
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