In response to strong feedback from last December’s seminar on Hydroplant safety, Prof. Pejovic will give a two-hours’ technical seminar on the ambiguity of Computational Fluid Dynamics (CFD) in the application of turbine modeling.

Fluid Dynamics applies approximate solutions, therefore must be verified on plants by experienced professionals. Computational Fluid Dynamics (CFD) includes problems from blood vessels to pipelines, as well Earth’s atmosphere, open surface flows, etc.; all difficult to compute. Modeling of turbulence, vortexes, real and mathematical instabilities are most difficult problems questioning validity of numerical predictions. Turbulence model selection impact accuracy even for simple applications. Most turbines and pumps operate under cavitation conditions followed by two-phase flow. Similarity between mathematical model, laboratory model and prototype are highly influenced by air content in the fluid. In the case of cavitation and/or air entrained into the fluid, there is no similarity at all. Three Gorges turbines manufacturers failed to detect similarity from model tests and CFD simulations to prototypes. Stay Vane and Wicket Gate Relationship Study (US Army Corps of Engineers) interesting result is that performance tests showed decrease in turbine efficiency, which is counter to CFD modeling. More examples will be presented. Professional engineers are responsible for all aspects of services and ensure comprehensive verifications of software and must understand whether software is appropriate for purpose intended (PEO). Only measurements on plants verify Fluid Mechanics computations.

Presenter Bio: Prof. Stanislav Pejovic, Ph.D., P.Eng., Expert International Chamber of Commerce, is Professor Emeritus at the University of Belgrade, Serbia. Currently he is a part time professor at the University of Toronto and Ryerson University. He is the author of recently published book “The Rules for Hydraulic Transient Design Analysis – Guide for Designers and Manufacturers – Recommendations for Investors and Managers”, 2018, (S. Pejovic and A Gajic), and a White Paper on Hydro Energy Storage, Faculty of Engineering, Architecture and Science Centre for Urban Energy, Ryerson University, Toronto, 2011.

Location: Huron Park community center, Meeting room Iroquois Room A+B
830 Paisley Blvd West, Mississauga ON, L5C 3P5

Time: 6:00 pm to 8:15 pm

Contact Jie Dong, Ph.D., P.Eng. at jie.dong@peo-mc.ca 

Cost: Free. Click here to register  (Refreshsments will be served)