Numerical Study of Sloshing Motion on Unstructured Mesh Using UMTHINC
Numerical Study of Sloshing Motion on Unstructured Mesh Using UMTHINC
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发表时间：
2019
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通讯作者：
Mohamed M. Kamra;Changhong Hu
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作者：
Mohamed M. Kamra;Changhong Hu
对不同的试验工况，在不同的充液量和振荡频率下进行了晃动运动的数值模拟。对数值计算结果进行了分析，并与实验数据进行了比较。数值计算采用基于流体体积（VOF）的雷诺平均纳维尔-斯托克斯（RANS）求解器。我们的内部数值求解器采用非结构化多维切双曲界面捕获方法（UMTHINC）结合各种湍流模型进行自由表面捕获。晃荡运动采用体积力法进行数值模拟，该方法在动量方程中引入了一个源项，对应于坦克的运动轮廓。冲击压力和自由表面的数值计算结果进行了比较，与已发表的实验数据在可能的情况下。通过对几种RANS模型的研究，分析了湍流模型对流体运动和冲击压力的影响，强调了湍流模型选择对载荷预测的影响。考虑两种方法研究了储罐内部结构的影响：有限厚度方法和零厚度方法。所开发的求解器是能够准确地捕捉复杂的界面结构，没有涂抹，即使与长时间的积分。结果表明，冲击压力以及一般的流体运动的有利协议。
The numerical simulations of sloshing motions are performed for different test cases with various filling levels and oscillation frequencies. The numerical results are analyzed and compared with experimental data. The numerical computations are performed with a Volume Of Fluid (VOF) based Reynolds-Averaged Navier-Stokes (RANS) solver. Our in-house numerical solver employs the unstructured multi-dimensional tangent hyperbolic interface capturing method (UMTHINC) for free-surface capturing combined with various turbulence models. The sloshing motion is numerically modeled using the body-force method which introduces a source term into the momentum equation corresponding to the tank motion profile. The numerical results of impact pressure and free-surface are compared with published experimental data wherever possible. The effect of turbulence model choice on loading predictions is highlighted by studying several RANS models and analyzing its effect on fluid motion and impact pressure. The effect of tank internal structures is studied by considering two approaches: finite thickness approach and zero-thickness approach. The developed solver is able to accurately capture the complex interface structure without smearing even with long time integration. The results showed a favorable agreement of impact pressure as well as the general fluid motion.