Initial Transients in Long Wave Computations

Initial Transients in Long Wave Computations

Initial transients in long wave computations are identified as free mode responses, forced by the incompatibility between the initial conditions and the forced response. Their character is described in the context of two typical one-dimensional channel problems and an analytical solution to the line...

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Bibliographic Details
Published in:Journal of hydraulic engineering (New York, N.Y.) Vol. 110; no. 10; pp. 1371 - 1397
Main Authors: Bode, Lance, Sobey, Rodney J
Format: Journal Article
Language:English
Published: Reston, VA American Society of Civil Engineers 01-10-1984
Subjects:
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Hydrodynamic waves
Physics
TECHNICAL PAPERS
Surface wave
Long wave
Wave propagation
Pipe flow
One dimensional flow
Transients
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Description
Summary:Initial transients in long wave computations are identified as free mode responses, forced by the incompatibility between the initial conditions and the forced response. Their character is described in the context of two typical one-dimensional channel problems and an analytical solution to the linearized equations. Strategies to avoid initial transients are investigated in detail, in particular, initially-enhanced friction, the gradual introduction of forcing and various radiation boundary conditions. A modified Reid radiation boundary condition is recommended for general application, supplemented where necessary by gradual introduction of the forcing to minimize initial spike responses.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0733-9429
1943-7900
DOI:10.1061/(ASCE)0733-9429(1984)110:10(1371)