Application of LES in Simulation of Fluid Buffet on Core Barrel Excited by FIV
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摘要: 用大涡模拟(LES)方法计算了秦山核电站二期1∶5模型实验的压力容器和吊篮之间环腔内的流场,获取了流体作用在吊篮上的流体压力,研究了Smagoriksky亚格子应力模型中的Smagoriksky系数对结果的影响;同时研究了流速对压力的影响以及压力沿空间的分布。结果表明,随着Smagorinsky系数增大,所得的压力均方根值(RMS)减小。与实验结果相比较,秦山核电站二期模型环腔内的流场模拟Smagorinsky系数取0.18比较合适,计算的脉动压力RMS与实验相吻合,在湍流发展充分的区域,流体压力功率谱密度计算值和实验值保持在同一个量级。Abstract: The fluid field in down comer between reactor vessel and core barrel of Qingshan II phase 1:5 model test is simulated with LES,and the pulse pressure distribution on the surface of the core barrel is obtained.The effect of Smagorinsky coefficient in Smagorinsky sub-grid model is studied and the result shows that the pressure RMS decreases with the increase of the Smagorinsky coefficient.The comparison with the experiment shows that when the Smagorinsky coefficient equals 0.18,it is suitable for the model test.The pulse pressure RMS of LES agrees with the experiment,and the difference of the pulse pressure PSD between LES and the experiment is discussed.The effect on the pressure by fluid velocity is studied and the distribution of pressure in space is obtained.
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Key words:
- LES /
- Reactor core barrel /
- Fluid buffet /
- CFX
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