Odd Harmonic Responses in Two-Dimensional AlGaAs∕GaAs HEMT Devices Due to Plasma Wave Interaction

2009 ◽  
Author(s):  
Abdul Manaf Hashim ◽  
Zon Fazlila Mohd Ahir ◽  
Seiya Kasai ◽  
Hideki Hasegawa ◽  
Swee-Ping Chia ◽  
...  
Keyword(s):  
Plasma Wave ◽  
Wave Interaction ◽  
Two Dimensional

Dissipation Improvement of MUSCL Scheme for Computational Aeroacoustics

2001 ◽  
Vol 17 (1) ◽  
pp. 39-47
Author(s):  
San-Yin Lin ◽  
Sheng-Chang Shih ◽  
Jen-Jiun Hu
Keyword(s):  
Wave Interaction ◽  
Sine Wave ◽  
Numerical Dissipation ◽  
Finite Volume Scheme ◽  
Linear Wave ◽  
Riemann Solver ◽  
Two Dimensional ◽  
Order Accuracy ◽  
Upwind Schemes ◽  
Continuous Waves

ABSTRACTAn upwind finite-volume scheme is studied for solving the solutions of two dimensional Euler equations. It based on the MUSCL (Monotone Upstream Scheme for Conservation Laws) approach with the Roe approximate Riemann solver for the numerical flux evaluation. First, dissipation and dispersion relation, and group velocity of the scheme are derived to analyze the capability of the proposed scheme for capturing physical waves, such as acoustic, entropy, and vorticity waves. Then the scheme is greatly enhanced through a strategy on the numerical dissipation to effectively handle aeroacoustic computations. The numerical results indicate that the numerical dissipation strategy allows that the scheme simulates the continuous waves, such as sound and sine waves, at fourth-order accuracy and captures the discontinuous waves, such a shock wave, sharply as well as most of upwind schemes do. The tested problems include linear wave convection, propagation of a sine-wave packet, propagation of discontinuous and sine waves, shock and sine wave interaction, propagation of acoustic, vorticity, and density pulses in an uniform freestream, and two-dimensional traveling vortex in a low-speed freestream.

Harmonic Responses in 2DEG AlGaAs∕GaAs HEMT Devices Due to Plasma Wave Interaction

2010 ◽  
Author(s):  
A. M. Hashim ◽  
S. Kasai ◽  
H. Hasegawa ◽  
Q. I. Alias ◽  
Mohamad Rusop ◽  
...  
Keyword(s):  
Plasma Wave ◽  
Wave Interaction

Turbulence healing via plasma-wave interaction: the results of a study via kinetic codes

2005 ◽  
Vol 169 (1-3) ◽  
pp. 207-209
Author(s):  
Chiara Marchetto ◽  
Francesco Califano ◽  
Maurizio Lontano
Keyword(s):  
Plasma Wave ◽  
Wave Interaction

Numerical Simulation of Non-Gaussian Wave Elevation and Kinematics Based on Two-Dimensional Fourier Transform

2006 ◽  
Author(s):  
Xiang Yuan Zheng ◽  
Torgeir Moan ◽  
Ser Tong Quek
Keyword(s):  
Fourier Transform ◽  
Wave Interaction ◽  
Wave Theory ◽  
Two Dimensions ◽  
Second Order ◽  
Interaction Matrix ◽  
Random Wave ◽  
Two Dimensional ◽  
Near Surface ◽  
Wave Elevation

The one-dimensional Fast Fourier Transform (FFT) has been extensively applied to efficiently simulate Gaussian wave elevation and water particle kinematics. The actual sea elevation/kinematics exhibit non-Gaussianities that mathematically can be represented by the second-order random wave theory. The elevation/kinematics formulation contains double-summation frequency sum and difference terms which in computation make the dynamic analysis of offshore structural response prohibitive. This study aims at a direct and efficient two-dimensional FFT algorithm for simulating the frequency sum terms. For the frequency difference terms, inverse FFT and FFT are respectively implemented across the two dimensions of the wave interaction matrix. Given specified wave conditions, not only the wave elevation but kinematics and associated Morison force are simulated. Favorable agreements are achieved when the statistics of elevation/kinematics are compared with not only the empirical fits but the analytical solutions developed based on modified eigenvalue/eigenvector approach, while the computation effort is very limited. In addition, the stochastic analyses in both time-and frequency domains show that the near-surface Morison force and induced linear oscillator response exhibits stronger non-Gaussianities by involving the second-order wave effects.

A Computationally Efficient Two-Dimensional Model of the Beam–Wave Interaction in a Coupled-Cavity TWT

2012 ◽  
Vol 40 (6) ◽  
pp. 1575-1589 ◽  
Author(s):  
Alexander N. Vlasov ◽  
Thomas M. Antonsen ◽  
Igor A. Chernyavskiy ◽  
David P. Chernin ◽  
Baruch Levush
Keyword(s):  
Wave Interaction ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Computationally Efficient ◽  
Beam Wave ◽  
Two Dimensional Model ◽  
Beam Wave Interaction ◽  
Coupled Cavity
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