2010
DOI: 10.1016/j.crma.2010.03.020
|View full text |Cite
|
Sign up to set email alerts
|

Localized solutions for the finite difference semi-discretization of the wave equation

Abstract: We study the propagation properties of the solutions of the finite-difference space semi-discrete wave equation on an uniform grid of the whole Euclidean space. We provide a construction of high frequency wave packets that propagate along the corresponding bi-characteristic rays of Geometric Optics with a group velocity arbitrarily close to zero. Our analysis is motivated by control theoretical issues. In particular, the continuous wave equation has the so-called observability property: for a sufficiently larg… Show more

Help me understand this report
View preprint versions

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1
1
1

Citation Types

0
6
0
2

Year Published

2010
2010
2021
2021

Publication Types

Select...
6
3

Relationship

2
7

Authors

Journals

citations
Cited by 15 publications
(8 citation statements)
references
References 5 publications
0
6
0
2
Order By: Relevance
“…High frequency wave packets may be used to show that the observability constant has to blow up at infinite order as h → (see [75], [76]). To do this it is sufficient to proceed as above but combining an increasing number of eigenfrequencies.…”
Section: Nonuniform Observabilitymentioning
confidence: 99%
“…High frequency wave packets may be used to show that the observability constant has to blow up at infinite order as h → (see [75], [76]). To do this it is sufficient to proceed as above but combining an increasing number of eigenfrequencies.…”
Section: Nonuniform Observabilitymentioning
confidence: 99%
“…But for instance this assumption may fail for spectral methods (global polynomial approximation) in which sign conditions may not be preserved at the nodes of the scheme. The same remark applies to (31).…”
Section: Resultsmentioning
confidence: 77%
“…The group velocity of two consecutive high frequency modes tends to zero as the discretization parameter goes to zero which prevent from using Ingham's inequality. This makes the observation (at a finite fixed time) very difficult as the discretization get finer [24]. This is why it is primordial to add a non physical numerical viscosity in order to damp these high frequencies.…”
Section: The Numerical Problemmentioning
confidence: 99%