Lg Wave Excitation and Propagation in Presence of One-, Two, and Three-Dimensional Heterogeneities.

1986 ◽  
Author(s):  
R. B. Herrmann
Keyword(s):  
Three Dimensional ◽  
Wave Excitation ◽  
Lg Wave

Efficient Plane Wave Excitation for 3-D Laguerre-Based FDTD Method

2014 ◽  
Vol 556-562 ◽  
pp. 4542-4546
Author(s):  
Zheng Chen ◽  
Yan Tao Duan ◽  
Ye Rong Zhang ◽  
Cheng Gao
Keyword(s):  
Plane Wave ◽  
Electric Fields ◽  
Laguerre Polynomials ◽  
Fdtd Method ◽  
Three Dimensional ◽  
Field Variable ◽  
Wave Excitation ◽  
Computationally Efficient ◽  
Scattering Problems ◽  
Scatter Field

In the three-dimensional (3-D) Laguerre-based finite-difference time-domain method, each electric field variable has the relationship with the adjacent twelve electric fields. This results in the tedious modification of field components adjacent to the total-field/scatter-field boundary in analyzing scattering problems. In addition, the plane wave excitation requires much time in evaluating the expansion coefficient of incident field which involves integral of the weighted Laguerre polynomials with respect to time. In this letter, the plane wave is introduced by defining a set of equivalent currents on a closed Huygen's surface and a computationally efficient one-dimensional auxiliary propagator is presented to speed up the plane wave excitation. Numerical results indicated that the proposed method is valid.

Parallel Computing Traveling Wave Effect on the Seismic Response of 3D Valley Topography Site under Long-Period Seismic Excitation

2010 ◽  
Vol 163-167 ◽  
pp. 3904-3909
Author(s):  
Wei Zhang ◽  
Min Wei Zhu ◽  
Tao Tao Shan
Keyword(s):  
Parallel Computation ◽  
Traveling Wave ◽  
Seismic Waves ◽  
Three Dimensional ◽  
Vertical Acceleration ◽  
Wave Excitation ◽  
Acceleration Response ◽  
Horizontal Acceleration ◽  
Long Period ◽  
Response Increase

In this paper, three typical bedrock long-period seismic waves and two commonly used waves were selected for three dimensional seismic responses parallel computation of a valley topography site under uniform excitation and traveling wave excitation. The equivalent-linear analysis method was used in simulation of soil’s non-linear properties. Computation results showed that horizontal acceleration response increase and vertical acceleration response decrease under long-period seismic wave excitation compared with those under commonly used waves excitation. When considering wave traveling effect, the horizontal acceleration response decrease and the vertical acceleration response increase. The conclusions are useful for relevant engineering projects. Parallel computation was also performed to raise computational efficiency.

Analysis of Wave Excitation of the Phase-Control ICRF Antennas with Three-Dimensional Full Wave Code on GAMMA 10

2015 ◽  
Vol 68 (1) ◽  
pp. 185-189 ◽  
Author(s):  
T. Yokoyama ◽  
M. Ichimura ◽  
A. Fukuyama ◽  
S. Sumida ◽  
M. Hirata ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Phase Control ◽  
Wave Excitation ◽  
Full Wave

Three-dimensional scattering of dielectric gratings under plane-wave excitation

2003 ◽  
Vol 2 ◽  
pp. 215-218 ◽  
Author(s):  
A. Coves ◽  
B. Gimeno ◽  
A.A.S. Blas ◽  
A. Vidal ◽  
V.E. Boria ◽  
...  
Keyword(s):  
Plane Wave ◽  
Three Dimensional ◽  
Wave Excitation ◽  
Dielectric Gratings

Numerical Estimation of Nonlinear Wave Forces on a Multi-Hull Barge Using Finite Element Method

2012 ◽  
Author(s):  
Aswathy Senan ◽  
P. Krishnankutty
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Nonlinear Wave ◽  
Nonlinear Problem ◽  
Three Dimensional ◽  
Independent Study ◽  
Second Order ◽  
Wave Forces ◽  
Wave Excitation ◽  
Element Method

This paper deals with the estimation of second order wave excitation forces on a free floating triple-hull barge using software developed based on finite element method. The wave-hull interaction nonlinear problem is presented here using the perturbation method, where potential flow theory is used. In the finite element model, the absorbing or nonreflecting far boundary condition is applied at a truncated surface in the form of boundary damper. The software developed for the solution of this nonlinear problem is validated for two and three-dimensional cases for which analytical and other numerical solutions are known. A convergence study on the three-dimensional cylinder problem is carried out to derive a guideline in selecting finite element mesh density and its grading. A triple-hull barge problem is selected here as a practical problem to study the nonlinear wave effects on the forces and motions. A grid independent study on this problem is carried out by using four finite element meshes of different density and grading. The optimum mesh selected from this study is used for further analysis of the problem. Bandwidth optimization is carried out on the generated meshes in order to reduce the computational effort, as the finite element algorithm used here is based on the banded solver technique. The second order wave excitation forces and moments on the barge estimated for different wave steepness (H/Lw - 0.08 to 0.012) in oblique sea condition shows that the second order surge and heave forces amounts up to 49% and 17.5% respectively and the second order yaw moment up to 39% when compared with the first order (linear) wave forces. Similar trend is observed for the forces and moments in beam sea and head sea conditions.

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