Influence of Boundary Conditions in Numerical Simulation of Free Surface Vortices
Influence of Boundary Conditions in Numerical Simulation of Free Surface Vortices
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DOI：
10.1016/j.egypro.2015.11.836
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发表时间：
2015-12
期刊：
影响因子：
--
通讯作者：
L. Cristofano;M. Nobili
中科院分区：
文献类型：
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作者：
L. Cristofano;M. Nobili
采用不同的方法对自由面涡流中的气核长度进行了数值计算。在过去，由于计算域的过度简化，只获得了与实验结果部分令人满意的一致性。在这项工作中，在没有任何简化的情况下，利用计算域进行了两相CFD模拟(采用流体体积法)，并根据气核长度分析了旋涡的形成过程。对不同的湍流模型进行了测试。进行了网格敏感性分析。用最先进的湍流模型(SST SAS-CC)得到的新的数值结果与实验结果相比有了更好的一致性，证实了施加适当的边界条件来正确模拟自由表面涡的重要性。
A numerical evaluation of gas core length in free surface vortices had been performed, applying different approaches. In the past only partial satisfactory agreement with experimental results was obtained because of an excessive simplification of the computational domain. In this work, two-phase CFD simulations (with Volume Of Fluid method) have been performed using a computational domain without any simplification and the evolution of the vortex formation has been analyzed in term of gas core length. Different turbulence models have been tested. A mesh sensitivity analysis has been performed. The new numerical results obtained with the most advanced turbulence model (SST SAS-CC) show an improved agreement with experimental data, with respect to the previous results, confirming the importance of imposing proper boundary conditions to correctly simulate free surface vortices.