Numerical Study on the Stability and Mixing of Vertical Round Buoyant Jet in Shallow Water
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摘要: 建立浅水静止环境中圆形轴对称垂直浮力射流的k-ε模型，采用混合有限分析方法进行了数值计算．针对两种不同的流动形态：近区的混合流体以浮力表面层的形式沿径向扩散的稳定排放；近区产生旋涡，浮力热水对混合热水形成二次挟带的非稳定排放，并对稳定性判据进行了验证，最后对两种不同流动结构下的远区的混合特性进行了数值模拟，结果同Lee和Jirka的试验和理论资料均十分吻合．Abstract: The k-epsilon model was applied to establish the mathematical model of vertical round buoyant jet discharging into confined depth,and it was solved using the Hybrid Finite Analytic Method (HFAM).The numerical predictions demonstrate two generic flow patterns for different jet discharge and environmental parameters:( ) a stable buoyant flow discharge with the mixed warm fluid leaving the near-field warm in a surface warm water layer;( ) an unstable buoyant flow discharge with recirculation and re-entrainment of warm water in the near field.Furthermore,the mixing characters of vertical round buoyant jet were numerically predicted.Both the stability criterion and numerical predictions of bulk dilutions are in excellent agreement with Lee and Jirkas experiments and theory.
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Key words:
- round buoyant jet /
- stability /
- numerical simulation /
- mixing character
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