Numerical investigation of unsteady cavitation around a NACA 66 hydrofoil using OpenFOAM

27th IAHR Symposium on Hydraulic Machinery and Systems

Hidalgo, V.H.^1,3 ; Luo, X.W.^1 ; Escaler, X.^2 ; Ji, J.^1 ; Aguinaga, A.^3

State Key Laboratory of Hydro Science and Engineering, Tsinghua University, Beijing, China^1

Centre for Industrial Diagnostics and Fluid Dynamics, UPC, Barcelona, Spain^2

Department of Mechanical Engineering, Escuela Politecnica Nacional, Quito, Ecuador^3

关键词: Cavitation damage;    Dynamic pressure fields;    Fluid machineries;    Fundamental characteristics;    Numerical investigations;    Prediction and control;    Python programming language;    Unsteady cavitation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/22/5/052013/pdf
DOI  :  10.1088/1755-1315/22/5/052013

来源: IOP

【 摘 要 】

The prediction and control of cavitation damage in pumps, propellers, hydro turbines and fluid machinery in general is necessary during the design stage. The present paper deals with a numerical investigation of unsteady cloud cavitation around a NACA 66 hydrofoil. The current study is focused on understanding the dynamic pressures generated during the cavity collapses as a fundamental characteristic in cavitation erosion. A 2D and 3D unsteady flow simulation has been carried out using OpenFOAM. Then, Paraview and Python programming language have been used to characterize dynamic pressure field. Adapted Large Eddy Simulation (LES) and Zwart cavitation model have been implemented to improve the analysis of cloud motion and to visualize the bubble expansions. Additional results also confirm the correlation between cavity formation and generated pressures.