Non-Hydrostatic Transitional Open-Channel Flows from a Supercritical to a Subcritical State

Slovak Journal of Civil Engineering

Zerihun Yebegaeshet T.¹ 

[1] David & James – Engineering and Environmental Consultancy, 204 Albion Road, Victoria 3350, Australia;

关键词: undular open-channel flow;    hydraulic jump;    near-critical turbulent flow;    flow instability;    numerical modeling;    curvilinear transitional flow;   

DOI  :  10.2478/sjce-2021-0012

来源: DOAJ

【 摘 要 】

In this study, a depth-averaged numerical model was employed to investigate the two-dimensional flow features of transitional open-channel flows from a supercritical to a subcritical state. Compared to a shallow-water model, the proposed model incorporates supplementary terms to account for the effects of non-uniform velocity and non-hydrostatic pressure distributions. The model equation was solved numerically by means of the Adams–Bashforth–Moulton scheme. A wide variety of transitional open-channel flow problems such as hydraulic jumps was considered for assessing the suitability of the numerical model. The results of the model for the free-surface profile, pressure distribution, and characteristics of the first wave of an undular jump were compared with the experimental data, and the agreement was found to be satisfactory. Despite the effects of the three-dimensional characteristics of the flow and the bulking of the flow caused by air entrainment, the model performed reasonably well with respect to the simulations of the mean flow characteristics of the curvilinear turbulent flow problems. Furthermore, the results of this investigation confirmed that the model is more suitable for analyzing near-critical turbulent flow problems without cross-channel shock waves.

【 授权许可】

Unknown