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A comparison study between CFD analysis and PIV technique for velocity distribution over the Standard Ogee crested spillways

机译：CFD分析与PIV技术与标准ogee Crested Spillways速度分布的比较研究

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摘要

A comprehensive study was performed to compare flow rate, mean velocity, vertical velocity distribution, and locations where the maximum velocity, dm, occurs on standard Ogee-crested spillways using experimental and numerical models. Five different models were constructed from rigid foam according to the specifications of the United States Army Corps of Engineers (USACE). The velocity of the flow was recorded along the downstream curve of the model for all models with different non-dimensional head ratios H/Hd of 0.50, 1.00, and 1.33. Particle Image Velocimetry (PIV) was used to measure the flow velocities. Velocity distributions were obtained by analyzing a series of captured images using Matlab codes. A commercially available Computational Fluid Dynamics (CFD) software package, Flow-3D, was used for modelling the experimental model setups. Flow-3D analyzes the Reynolds-averaged Navier-Stokes equations and is widely verified for use in the field of spillway flow analysis. The maximum difference between numerical and experimental results in mean velocity values that do not exceed 6.2% for all values of head ratios. The interpolated values of recorded maximum velocity by the PIV technique are smaller than those values numerically computed. In the lower dm locations, the percent difference between these regions reaches -8.65%; the upper locations are 2.87%. The vertical location (dm) drops to the lower location when the upstream head increases, and the distance from the spillway axis decreases linearly.
机译：进行全面的研究以比较使用实验和数值模型在标准ogee-Crested溢洪道上发生最大速度DM的流速，平均速度，垂直速度分布和位置。根据美国陆军工程师（USACE）的规格，从刚性泡沫建造了五种不同的型号。所有模型的下游曲线都记录了流的下游曲线，其所有型号为0.50,1.00和1.33的不同非尺寸头比率H / HD。粒子图像速度（PIV）用于测量流速。通过使用MATLAB代码分析一系列捕获的图像来获得速度分布。商业化的计算流体动力学（CFD）软件包Flow-3D用于建模实验模型设置。流动3D分析雷诺平均的Navier-Stokes方程，广泛验证用于溢洪道流程分析领域。数值和实验结果之间的最大差异导致的平均值值对于所有头比的所有值不超过6.2％。 PIV技术记录的最大速度的内插值小于数值计算的那些值。在较低的DM位置，这些地区之间的百分比达到-8.65％;上部位置为2.87％。当上游头部增加时，垂直位置（DM）落到下部位置，并且距溢洪道轴线的距离线性降低。

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