Inlet effects on roll-wave development in shallow turbulent open-channel flows

Title:

Inlet effects on roll-wave development in shallow turbulent open-channel flows

Creator:

Campomaggiore, Francesca, Di Cristo, Cristiana, Iervolino, Michele, and Vacca, Andrea

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:b164103e-f5af-4ef7-801d-0c090694ca1d
uuid:b164103e-f5af-4ef7-801d-0c090694ca1d
doi:10.1515/johh-2016-0003

Subject:

open-channel flows, roll-waves, hypercritial flows, and numerical simulation

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

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 rollwave 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.

Language:

Slovak

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

45-55

Source:

Journal of hydrology and hydromechanics | 2016 Volume:64 | Number:1

Harvested from:

CDK

Metadata only:

false