Modelling free surface flow with curvilinear streamlines by a non-hydrostatic model

Title:

Modelling free surface flow with curvilinear streamlines by a non-hydrostatic model

Creator:

Zerihun, Yebegaeshet T.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:fd5835eb-43a1-425d-824a-a82c5ebab72c
uuid:fd5835eb-43a1-425d-824a-a82c5ebab72c
doi:10.1515/johh-2016-0028

Subject:

curvilinear flow, finite difference method, hydraulic structures, hydrodynamics, non-hydrostatic pressure, and nonuniform flow

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

This study addresses a particular phenomenon in open channel flows for which the basic assumption of hydrostatic pressure distribution is essentially invalid, and expands previous suggestions to flows where streamline curvature is significant. The proposed model incorporates the effects of the vertical curvature of the streamline and steep slope, in making the pressure distribution non-hydrostatic, and overcomes the accuracy problem of the Saint-Venant equations when simulating curvilinear free surface flow problems. Furthermore, the model is demonstrated to be a higher-order one-dimensional model that includes terms accounting for wave-like variations of the free surface on a constant slope channel. Test results of predicted flow surface and pressure profiles for flow in a channel transition from mild to steep slopes, transcritical flow over a short-crested weir and flow with dual free surfaces are compared with experimental data and previous numerical results. A good agreement is attained between the experimental and computed results. The overall simulation results reveal the satisfactory performance of the proposed model in simulating rapidly varied gravity-driven flows with predominant non-hydrostatic pressure distribution effects. This study suggests that a higher-order pressure equation should be used for modelling the pressure distribution of a curvilinear flow in a steeply sloping channel.

Language:

Slovak

Rights:

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

Coverage:

281-288

Source:

Journal of hydrology and hydromechanics | 2016 Volume:64 | Number:3

Harvested from:

CDK

Metadata only:

false