Uniform error bounds of a time-splitting spectral methods for the long-time dynamics of the nonlinear Klein-Gordon equation with weak nonlinearity

2021 ◽  
Author(s):  
Weizhu Bao ◽  
Yue Feng ◽  
Chunmei Su
Keyword(s):  
Error Bounds ◽  
Spectral Methods ◽  
Gordon Equation ◽  
Weak Nonlinearity ◽  
Time Dynamics ◽  
Long Time ◽  
Klein Gordon ◽  
Time Splitting ◽  
Long Time Dynamics ◽  
Klein Gordon Equation

scholarly journals Long time dynamics for damped Klein-Gordon equations

2017 ◽  
Vol 50 (6) ◽  
pp. 1447-1498
Author(s):  
Nicolas Burq ◽  
Geneviève Raugel ◽  
Wilhelm Schlag
Keyword(s):  
Time Dynamics ◽  
Long Time ◽  
Klein Gordon ◽  
Long Time Dynamics

scholarly journals Long time decay for 2D Klein–Gordon equation

2010 ◽  
Vol 259 (2) ◽  
pp. 477-502 ◽  
Author(s):  
E.A. Kopylova ◽  
A.I. Komech
Keyword(s):  
Gordon Equation ◽  
Time Decay ◽  
Long Time ◽  
Klein Gordon ◽  
Klein Gordon Equation

Long time dynamics for damped Klein-Gordon equations

2017 ◽  
Vol 50 (6) ◽  
pp. 1447-1498
Author(s):  
Nicolas Burq ◽  
Geneviève Raugel ◽  
Wilhelm Schlag
Keyword(s):  
Time Dynamics ◽  
Long Time ◽  
Klein Gordon ◽  
Long Time Dynamics

On the response of convectively unstable flows to oscillatory forcing with application to liquid sheets

2012 ◽  
Vol 699 ◽  
pp. 115-152 ◽  
Author(s):  
N. S. Barlow ◽  
S. J. Weinstein ◽  
B. T. Helenbrook
Keyword(s):  
Gordon Equation ◽  
Saddle Points ◽  
Liquid Sheet ◽  
Integral Solution ◽  
Series Solutions ◽  
Classical Literature ◽  
Spatial Growth ◽  
Long Time ◽  
Klein Gordon ◽  
Klein Gordon Equation

AbstractThe complete integral solution is found for the convectively unstable and oscillatory-forced linear Klein–Gordon equation as a function of spatial variable, $x$, and time, $t$. A comparison of the integral solution with series solutions of the Klein–Gordon equation elucidates salient features of both the transient and long-time spatially growing solutions. A rigorous method is developed for identifying the key $x/ t$ rays associated with saddle points that can be used to characterize the transition between transient temporally growing and long-term spatially growing waves. This method effectively combines the procedure given by Gordillo & Pérez-Saborid (Phys. Fluids, vol. 14, 2002, pp. 4329–4343) for determining the $x/ t$ ray at which the forced spatial growth response affects the observed waveform and competes with the transient response, with an established methodology for identifying the leading and trailing edge rays of an impulse response. The method is applied to a linearized system describing an oscillatory-forced liquid sheet and asymptotic predictions are obtained. Series solutions are used to validate these predictions. We establish that the portion of the solution responsible for spatial growth in the signalling problem is correctly identified by Gordillo & Pérez-Saborid (Phys. Fluids, vol. 14, 2002, pp. 4329–4343), and that this interpretation is in contrast with the classical literature. The approach provided here can be applied in multiple ways to study a convectively unstable oscillatory-forced medium. In cases where numerical or series solutions are readily available, the proposed method is used to extract key features of the solution. In cases where only the forced long time behaviour is needed, the dispersion relation is used to extract: (i) the time required to see the forced solution; (ii) the amplitude, phase and spatial growth of the forced solution; and (iii) the breadth of the transient.

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