掺气减蚀设施数值模拟研究探讨

采用标准κ-ε模型和VOF模型及欧拉模型对泄洪洞及掺气设施水力特性进行了三维数值模拟计算。主要计算了自由水面、掺气设施水力特性和空腔特性及坎后沿程渠底板中心线的掺气浓度。计算结果表明,VOF模型和欧拉模型可以在一定程度上模拟掺气设施水力特性和空腔形态等水力参数。总体而言,在对泄洪洞掺气设施的数值模拟方面,欧拉模型在一定程度上比VOF模型有更好的模拟精度。利用数值模拟可提高水利设计效率和节省费用,并为模型试验提供前期预测和指导,同时其结果可以作为模型试验补充和完善的依据,本文所采用的数值模拟方法及研究结果可供类似工程的研究参考。

Investigation on Numerical Simulation of Aeration Devices

Standard κ-ε turbulence model, VOF model and Eulerian model were employed to simulate the three dimensional hydraulic characteristics of aerator in sluice tunnel. Free water surface, hydraulic characteristics and cavity characteristics on the aerator, as well as aerated air concentration along the centerline of the bottom of the channel behind the aerator were obtained. Results reveal that the VOF model and Eulerian model can be used to simulate the hydraulic characteristics of aerator and the cavity shape of aeration. In general, Eulerian model is more precise than VOF in simulating the aerator of sluice tunnel. Numerical simulation could improve the efficiency of project design and save cost, and provide guidance for model test. Also the simulation results could be taken as the basis to improve and perfect the model test. The numerical method and research result is a reference for similar engineering.