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Inlet effects on roll-wave development in shallow turbulent open-channel flows
- Source :
- Journal of Hydrology and Hydromechanics, Vol 64, Iss 1, Pp 45-55 (2016)
- Publication Year :
- 2016
- Publisher :
- Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic, 2016.
-
Abstract
- The present work investigates the effect of the flow profile induced by an inlet condition on the roll-wave evolution in turbulent clear-water flows. The study employs theoretical and numerical analyses. Firstly, the influence of the inlet condition on the spatial evolution of a single perturbation in a hypercritical flow is examined through the expansion near a wavefront analysis. The results show that an accelerated unperturbed profile reduces the disturbance spatial growth. A decelerated profile causes an increase. The effect of the flow profile on the spatial evolution of roll-wave trains is then numerically investigated solving the Saint Venant equations with a second-order Runge-Kutta Total Variation Diminishing (TVD) Finite Volume scheme. The numerical simulations comply with the analytical results for the initial and transition phases of the roll-wave development. The unperturbed profile influences even the roll-waves statistical characteristics in the final stage, with a more evident effect in case of accelerated profiles. The influence of the flow profile should be therefore accounted for in the formulation of predictive criteria for roll-waves appearance based on the estimation of the disturbance spatial growth rate.
- Subjects :
- hypercritial flows
0208 environmental biotechnology
Mechanical engineering
TA Engineering (General). Civil engineering (General)
02 engineering and technology
Physics::Fluid Dynamics
roll-waves
Total variation diminishing
Spatial evolution
Growth rate
Numerical simulation
open-channel flows
Shallow water equations
Water Science and Technology
Roll-wave
Fluid Flow and Transfer Processes
geography
geography.geographical_feature_category
Finite volume method
Turbulence
Mechanical Engineering
Mechanics
Hydraulic engineering
Inlet
020801 environmental engineering
Open-channel flow
numerical simulation
Hypercritial flow
Open-channel flows
Roll-waves
Hypercritial flows
TC1-978
Geology
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Journal of Hydrology and Hydromechanics, Vol 64, Iss 1, Pp 45-55 (2016)
- Accession number :
- edsair.doi.dedup.....cd6397f8aec77e2deb1e3edc5744bdb9