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A study for cavitating flow analysis using DES model

机译：利用DES模型进行空化流分析的研究

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This paper presents the ongoing research on cavitation modelling so far which include validation studies to simulate the hydrodynamic characteristics of the Delft twisted hydrofoil and a controllable pitch propeller VP1304 (PPTC propeller) with zero shaft and inclined shaft cavitating flow conditions. Cavitating flow characteristics are modelled by performing Computational Fluid Dynamics (CFD) simulations using Detached Eddy Simulation (DES) method with SST (Menter) k-omega turbulence model. Multiphase viscous flow, water and air, are modelled using Eulerian multiphase approach and motion of the fluid volume throughout the computational domain is modelled with Volume of Fluid (VOF) approach capturing the interface. Cavitation is modelled by Schnerr-Sauer cavitation model with Reboud correction. The predicted three dimensional cavity structures around the twisted hydrofoil agree fairly well with the experimental observations given in open literature. Lift forces predicted using DES calculation are very close to that of the calculated ones, using a recommended quadratic function. The performance of the PPTC propeller for different conditions are conventionally represented in terms of non-dimensional coefficients, i.e., thrust coefficient (K-T), torque coefficient (K-Q) and efficiency (eta) and cavity patterns on the propeller blades compared with the literature show good agreement with the experimental data.
机译：本文介绍了迄今为止正在进行的关于气蚀模型的研究，其中包括验证研究以模拟代尔夫特扭曲水翼和零螺距和斜轴空化流动条件下的可控螺距螺旋桨VP1304（PPTC螺旋桨）的流体动力学特性。通过使用分离涡流模拟（DES）方法和SST（Menter）k-ω湍流模型执行计算流体动力学（CFD）模拟，对空化流动特性进行建模。使用欧拉多相方法对多相粘性流，水和空气进行建模，并使用捕获接口的流体体积（VOF）方法对整个计算域中的流体体积运动进行建模。空化是由具有Reboud校正的Schnerr-Sauer空化模型建模的。扭曲的水翼周围的三维空间预测结构与公开文献中的实验观察结果非常吻合。使用推荐的二次函数，使用DES计算预测的升力非常接近所计算的升力。传统上，PPTC螺旋桨在不同条件下的性能用无量纲系数表示，即螺旋桨叶片上的推力系数（KT），扭矩系数（KQ）和效率（η）和腔型与文献显示的相比与实验数据吻合良好。

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