Verification and validation of URANS simulations of the turbulent cavitating flow around the hydrofoil

• Published in: Journal of hydrodynamics. Series B Vol. 29; no. 4; pp. 610 - 620
• Main Author: 龙云 龙新平 季斌 槐文信 钱忠东
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.08.2017; Springer Singapore; State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072 China; Science and Technology on Water Jet Propulsion Laboratory, Shanghai 200011, China,%State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072 China; HubeiKey Laboratory of Waterjet Theory and New Technology, School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China; HubeiKey Laboratory of Waterjet Theory and New Technology, School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China%State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072 China
• Subjects: Cavitating flow; cavitation; Engineering; Engineering Fluid Dynamics; Hydrology/Water Resources; Numerical and Computational Physics; Simulation; uncertainty; verification and validation (V&V); 不确定性; 估计方法; 模拟验证; 水翼; 流动模拟; 湍流流场; 空化模型; 空泡流; Cavitating flow; uncertainty; verification and validation (V&V); cavitation
• ISSN: 1001-6058; 1878-0342
• DOI: 10.1016/S1001-6058(16)60774-6

In this paper, we investigate the verification and validation（V＆V） procedures for the URANS simulations of the turbulent cavitating flow around a Clark-Y hydrofoil. The main focus is on the feasibility of various Richardson extrapolation-based uncertainty estimators in the cavitating flow simulation. The unsteady cavitating flow is simulated by a density corrected model（DCM） coupled with the Zwart cavitation model. The estimated uncertainty is used to evaluate the applicability of various uncertainty estimation methods for the cavitating flow simulation. It is shown that the preferred uncertainty estimators include the modified Factor of Safety（FS1）, the Factor of Safety（FS） and the Grid Convergence Index（GCI）. The distribution of the area without achieving the validation at the U v level shows a strong relationship with the cavitation. Further analysis indicates that the predicted velocity distributions, the transient cavitation patterns and the effects of the vortex stretching are highly influenced by the mesh resolution.