scholarly journals Nonlinear Acoustic Waves in Fluid-Saturated Porous Rocks – Poro-Acoustoelasticity Theory

10.5772/48550 ◽  
2012 ◽  
Author(s):  
Jing Ba ◽  
Hong Cao ◽  
Qizhen Du
Keyword(s):  
Acoustic Waves ◽  
Porous Rocks ◽  
Nonlinear Acoustic

Nonlinear acoustic waves in fluid‐saturated porous rocks

2009 ◽  
Author(s):  
Jing Ba ◽  
Hong Cao ◽  
Fengchang Yao
Keyword(s):  
Acoustic Waves ◽  
Porous Rocks ◽  
Nonlinear Acoustic

Propagation of nonlinear acoustic waves in bimodular media with linear dissipation

Wave Motion ◽  
2013 ◽  
Vol 50 (2) ◽  
pp. 191-196 ◽  
Author(s):  
A. Radostin ◽  
V. Nazarov ◽  
S. Kiyashko
Keyword(s):  
Acoustic Waves ◽  
Nonlinear Acoustic ◽  
Bimodular Media

Amplification of energy flux of nonlinear acoustic waves in a gas-filled tube under an axial temperature gradient

2002 ◽  
Vol 456 ◽  
pp. 377-409 ◽  
Author(s):  
N. SUGIMOTO ◽  
K. TSUJIMOTO
Keyword(s):  
Boundary Layer ◽  
Temperature Gradient ◽  
Energy Flux ◽  
Acoustic Waves ◽  
Wave Equations ◽  
Main Flow ◽  
Nonlinear Wave Equations ◽  
Axial Temperature Gradient ◽  
Axial Temperature ◽  
Nonlinear Acoustic

This paper considers nonlinear acoustic waves propagating unidirectionally in a gas-filled tube under an axial temperature gradient, and examines whether the energy flux of the waves can be amplified by thermoacoustic effects. An array of Helmholtz resonators is connected to the tube axially to avoid shock formation which would otherwise give rise to nonlinear damping of the energy flux. The amplification is expected to be caused by action of the boundary layer doing reverse work, in the presence of the temperature gradient, on the acoustic main flow outside the boundary layer. By the linear theory, the velocity at the edge of the boundary layer is given in terms of the fractional derivatives of the axial velocity of the gas in the acoustic main flow. It is clearly seen how the temperature gradient controls the velocity at the edge. The velocity is almost in phase with the heat flux into the boundary layer from the wall. With effects of both the boundary layer and the array of resonators taken into account, nonlinear wave equations for unidirectional propagation in the tube are derived. Assuming a constant temperature gradient along the tube, the evolution of compression pulses is solved numerically by imposing the initial profiles of both an acoustic solitary wave and of a square pulse. It is revealed that when a positive gradient is imposed, the excess pressure decreases while the particle velocity increases and that the total energy flux can indeed be amplified if the gradient is suitable.

Finite-difference time-domain scheme for nonlinear acoustic waves in solids

2019 ◽  
Vol 130 ◽  
pp. 790-799 ◽  
Author(s):  
Xiaoyu Wang ◽  
Xun Gong ◽  
Chuanxi Qin ◽  
De Zhang ◽  
Haodong Wu ◽  
...  
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Acoustic Waves ◽  
Finite Difference Time Domain ◽  
Nonlinear Acoustic ◽  
Difference Time
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