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The steady flow in open channels was addressed in the previous chapters. However, in real-world systems, flow conditions change with time, resulting in unstable flows. Natural processes, human acts, and accidents and incidents may all contribute to the unsteadiness. The analysis of unsteady flows is usually more complex than that of steady flows because unsteady-flow conditions be function of both space and time, thereby, partial differential equations for the dependent variables (flow depth and flow velocity) are used. A closed-form solution of these equations is not available except in very simplified cases and thus numerical methods are employed for their solution.
In this chapter, a number of commonly used terms are first defined. The causes of unsteady flow are then discussed and equations for the velocity of a gravity wave are derived.
The steady flow in open channels was addressed in the previous chapters. However, in real-world systems, flow conditions change with time, resulting in unstable flows. Natural processes, human acts, and accidents and incidents may all contribute to the unsteadiness. The analysis of unsteady flows is usually more complex than that of steady flows because unsteady-flow conditions be function of both space and time, thereby, partial differential equations for the dependent variables (flow depth and flow velocity) are used. A closed-form solution of these equations is not available except in very simplified cases and thus numerical methods are employed for their solution.
In this chapter, a number of commonly used terms are first defined. The causes of unsteady flow are then discussed and equations for the velocity of a gravity wave are derived.
UNSTEADY FLOW
Chaudhry, M. Hanif (author)
Open-Channel Flow ; Chapter: 11 ; 337-346
2022-01-01
10 pages
Article/Chapter (Book)
Electronic Resource
English
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