摘要
采用Fluent双方程紊流模型研究有限深静水环境中的二维垂向紊动射流,基于Fluent的VOF方法跟踪自由表面、UDF技术(用户自定义函数)给出边界条件。采用该模型研究了不同射流速度与水深组合的自由射流及带升管射流等工况,分析了其模拟结果,并采用形状参数α对射流出口升管进行分类。结果表明,当α≥7.50时,射流场稳定,环境水体不能进入升管;当1.67≤α≤5.00时,射流场具有不稳定特征,环境水体将以回旋流方式进入升管;当α≤1.50时,升管对射流的流场影响较小。
The commercial CFD software Fluent is introduced to study the flow characteristics of 2D vertical turbulent jet, which is under the defined water depth and stagnant environment. The VOF method and UDF technology based on Fluent is adopted to trace the free surface and simulate the turbulent characteristics of jet. Cases with different combination of jet velocity, water depth and confinement are studied. A confinement index α is proposed to categorize the confined jet. It is found that jet appears instability characteristics when a is in the range of 1.67 and 5.00; for α≥7.50, the jet field is highly confined and there is no ambient water entered the confinement; for α≤1. 15, the confinement has little or no effect to the jet field.
出处
《水电能源科学》
北大核心
2011年第5期83-85,共3页
Water Resources and Power
