Examination of Computational Precision versus Modeling Complexity for Open Channel Flow with Hydraulic Jump

• 作者: Prasada Rao Theodore V. Hromadka II
• 来源期刊: 水资源与保护(英文)
• 学科: 工学
• 关键词: OPENFOAM HEC-RAS WSPG Rapidly VARYING FLOWS
• 年，卷（期）: 2019,（10）
• 页码范围: 1233-1244
• 页数: 12页
• 分类号: TV1

摘要

In this work, for flow with a hydraulic jump, the predictive capabilities of popular hydraulic models (HEC-RAS and WSPG) are validated with the published results from the three dimensional Computational Fluid Dynamics (CFD) model (OpenFOAM). The analysis is performed for flows with a Froude number of 6.125 and Reynolds number of 3.54 × 105. While the hydraulic models solve the one-dimensional energy equation, in the CFD model solution of the three dimensional Reynolds averaged Navier-Stokes (RANS) equations, with a turbulence model, is used. As the results indicate, although the hydraulic models can satisfactorily predict the location of the steady-state jump, the length of the hydraulic jump (i.e. distance from the toe of the jump to a location in tail water zone) and other jump characteristics are better simulated by the CFD model. The solution from hydraulic models is sensitive to the channel bottom roughness value.