CFX空化模型] (2)-学习文件.pdf

Extension and Validation Extension and Validation of the CFX Cavitation of the CFX Cavitation Model for Sheet and Tip Model for Sheet and Tip Vortex Cavitation on Vortex Cavitation on Hydrofoils Hydrofoils C. Lifante, T. Frank, M. Kuntz C. Lifante, T. Frank, M. Kuntz ANSYS Germany, 83624 Otterfing ANSYS Germany, 83624 Otterfing Conxita.Lifante@ Conxita.Lifante@ © 2006 ANSYS, Inc. All rights reserved. ANSYS, Inc. Proprietary Overview Overview • Introduction • Cavitation project – Goals – Cavitation model – Testcases • Results – Testcase set-up – Validation studies • Summary © 2006 ANSYS, Inc. All rights reserved. 2 ANSYS, Inc. Proprietary Cavitation on Pumps, Propellers Cavitation on Pumps, Propellers Hydrofoils Hydrofoils • Cavitation phenomena • Propeller – Tip vortex cavitation • Hydrofoil – Sheet cloud cavitation © 2006 ANSYS, Inc. All rights reserved. 3 ANSYS, Inc. Proprietary Cavitation Project Cavitation Project • Title – Investigation of higher order pressure fluctuations and its influence on ship stern, taking into account cavitation at propeller blades • Project partners – SVA Potsdam, ANSYS Germany • Duration – July 2005 to June 2008 • Funded by German Ministry of Education and Research (BMBF) • Main issues – CFD experiments for ship propeller cavitation – Cavitation including transient effects – Cavitation induced pressure fluctuations and interaction with ship stern © 2006 ANSYS, Inc. All rights reserved. 4 ANSYS, Inc. Proprietary Cavitation Model-Rayleigh-Plesset Cavitation Model-Rayleigh-Plesset Equation Equation • Interfacial mass