Elastic pulsed wave propagation in media with second‐ or higher‐order nonlinearity. Part II. Simulation of experimental measurements on Berea sandstone

1996 ◽  
Vol 99 (6) ◽  
pp. 3346-3352 ◽  
Author(s):  
Koen E‐A Van Den Abeele ◽  
Paul A. Johnson
Keyword(s):  
Wave Propagation ◽  
Higher Order ◽  
Experimental Measurements ◽  
Berea Sandstone

scholarly journals Dynamics of Extreme Stratospheric Negative Heat Flux Events in an Idealized Model

2018 ◽  
Vol 75 (10) ◽  
pp. 3521-3540 ◽  
Author(s):  
Etienne Dunn-Sigouin ◽  
Tiffany Shaw
Keyword(s):  
Heat Flux ◽  
Wave Propagation ◽  
Recent Work ◽  
Wave Interaction ◽  
Higher Order ◽  
Negative Events ◽  
Flow Mechanism ◽  
Mean Flow ◽  
Idealized Model

Recent work has shown that extreme stratospheric wave-1 negative heat flux events couple with the troposphere via an anomalous wave-1 signal. Here, a dry dynamical core model is used to investigate the dynamical mechanisms underlying the events. Ensemble spectral nudging experiments are used to isolate the role of specific dynamical components: 1) the wave-1 precursor, 2) the stratospheric zonal-mean flow, and 3) the higher-order wavenumbers. The negative events are partially reproduced when nudging the wave-1 precursor and the zonal-mean flow whereas they are not reproduced when nudging either separately. Nudging the wave-1 precursor and the higher-order wavenumbers reproduces the events, including the evolution of the stratospheric zonal-mean flow. Mechanism denial experiments, whereby one component is fixed to the climatology and others are nudged to the event evolution, suggest higher-order wavenumbers play a role by modifying the zonal-mean flow and through stratospheric wave–wave interaction. Nudging all tropospheric wave precursors (wave-1 and higher-order wavenumbers) confirms they are the source of the stratospheric waves. Nudging all stratospheric waves reproduces the tropospheric wave-1 signal. Taken together, the experiments suggest the events are consistent with downward wave propagation from the stratosphere to the troposphere and highlight the key role of higher-order wavenumbers.

Experimental measurements of lower‐hybrid wave propagation in the Versator II tokamak using microwave scattering

1991 ◽  
Vol 3 (8) ◽  
pp. 2101-2112 ◽  
Author(s):  
R. Rohatgi ◽  
K.‐I. Chen ◽  
G. Bekefi ◽  
P. Bonoli ◽  
S. C. Luckhardt ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Lower Hybrid ◽  
Experimental Measurements ◽  
Hybrid Wave ◽  
Lower Hybrid Wave ◽  
Microwave Scattering

Wave propagation in functionally graded plates with porosities using various higher-order shear deformation plate theories

2015 ◽  
Vol 53 (6) ◽  
pp. 1143-1165 ◽  
Author(s):  
Sihame Ait Yahia ◽  
Hassen Ait Atmane ◽  
Mohammed Sid Ahmed Houari ◽  
Abdelouahed Tounsi
Keyword(s):  
Wave Propagation ◽  
Shear Deformation ◽  
Higher Order ◽  
Functionally Graded ◽  
Functionally Graded Plates
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