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MAE Seminar
Start Date: 9/9/2014Start Time: 2:00 PM
End Date: 9/9/2014End Time: 4:00 PM

"Recent Progress in Numerical Prediction of Cavitating Flows with Special Emphasis on Unsteady Loads and on Erosive Collapse Events"

Steffen J. Schmidt

Institute of Aerodynamics and Fluid Mechanics, Technical University of Munich (AER/TUM)
2pm, September 9, 2014 (Tuesday)
Phillips Hall 640



The numerical prediction of erosive events in cavitating flows is a huge challenge due to strongly different temporal and spatial scales. We apply fully compressible models and time steps down to nanoseconds in order to resolve shock formation and wave propagation due to collapsing vapor patterns occurring in typical hydrodynamic cavitation processes. Our cavitation model is based on simple thermodynamic considerations without user-defined parameters. Although this approach seems to be oversimplified at first sight, it turns out that its potential for qualitative and quantitative prediction of typical flow characteristics is surprisingly high. In order to demonstrate this, a series of simulations will be presented and briefly discussed. It will be concluded that sufficient temporal and spatial resolution are the key issues in numerical simulation in cavitation flows. The talk will be organized as follows. 1. The concept of filtering - why finite volume methods may automatically lead to consistent two-phase models 2. Thermodynamic modeling of cavitating flows based on equilibrium assumptions 3. Brief overview of numerical approaches used at AER/TUM for simulation of cavitating flows 4. From the collapse of a cloud of bubbles to the collapse of an equivalent mixture 5. Simulation examples including wall resolved LES in a micro channel 6. Erosion prediction via collapse detection 7. Estimation of incubation times based on simple material models

Biographical Sketch:

Steffen J. Schmidt, Head of Gas Dynamics research group at the Institute of Aerodynamics and Fluid Mechanics, Technical University of Munich (AER/TUM)


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