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Ocean Engineering Group/EWRE (8/25/09) Spyros A. Kinnas (Google: Kinnas Home Page) Professor and Director of OTRC’s UT O

Research in the area of computational hydrodynamics with applications on the prediction of performance and design of high-speed marine propulsors , modeling of cavitation , and wave/body interaction . Teaching: CE358: Introductory Ocean Engineering (Fall ‘09)

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Ocean Engineering Group/EWRE (8/25/09) Spyros A. Kinnas (Google: Kinnas Home Page) Professor and Director of OTRC’s UT O

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  1. Research in the area of computational hydrodynamics with applications on the prediction of performance and design of high-speed marine propulsors, modeling of cavitation, and wave/body interaction. • Teaching: • CE358: Introductory Ocean Engineering (Fall ‘09) • CE319F: Elementary Fluid Mechanics • CE397: Theory of Propulsors (NEW: + wind/tidal turbines -Spring’10) • CE380T: Computational Environmental Fluid Mechanics (tent. Spring ‘11) • CE380P: Boundary Element Methods (tent. Spring ‘12) Ocean Engineering Group/EWRE (8/25/09) Spyros A. Kinnas (Google: Kinnas Home Page) Professor and Director of OTRC’s UT Office (Offshore Technology Research Center) • Facilities: • Computational Hydrodynamics Laboratory (ECJ 8.502) with 2 computer clusters: an older one of 16-node 2-CPU each, and a new 16-node 2-Quad-core CPU each

  2. Some recent marine propulsors … Contra-rotating props Podded prop

  3. …and some water-turbines (used to generate energy from ocean currents)

  4. Water-jet Propulsors Direction of boat

  5. Axial Flow Water-jet Propulsor Inflow Stator Rotor

  6. Surface-piercing (or cleaver) propellers

  7. For high-speed propellers cavitation is often inevitable Tip vortex Sheet • Cavitation can accelerate erosion of blades, produce noise, or result in sudden loss of thrust • However, allowing for some cavitation can increase efficiency

  8. Two methods to model flow Boundary Element Method (addressed in CE380P) Finite Volume Method (addressed in CE380T) • BEM can only deal with inviscid flow. The effects of viscosity are evaluated via coupling with integral boundary layer methods • FVM needs a very large number of cells to resolve boundary layer within acceptable accuracy

  9. BEM vs. FVM(application to surface-piercing hydrofoil)Vinayan, PhD’09, UT/OEG • BEM takes 16 mins on a single processor • FVM (Fluent) takes 36 hours running parallel in 6 processors

  10. Validation with Experiments: Surface-PiercingPropeller M841B Comparison of ventilation patterns

  11. Model of water-jet pump performance(Sun, PhD ’08, UT/OEG) Torque on rotor vs. flow-rate

  12. Prediction of performance of tidal turbines • Comparisons of the predicted thrust coefficient and power coefficient for varying TSR=wR/V Cthrust vs. TSR Cpower .vs. TSR

  13. Prediction of Cavitation

  14. Floating Production systems for Storage and Offloading (FPSO) FPSO Hulls can suffer from excessive Roll Motions (periodic angular motions about the longitudinal axis)

  15. Bilge keels are used to mitigate roll

  16. Model of viscous flow around bilge keels and their effect on damping (Yu, PhD ’08, UT/OEG)

  17. Model of viscous flow around bilge keels and their effect on damping (NS-2D/-3D: UT/OEG’s method)(Yu, PhD ’08, UT/OEG) Damping coefficient vs. roll frequency BEM is VERY INACCURATE in the case of roll

  18. 3 full-time GRAs (2 committed/ 1 available) • Computational methods (BEM/FVM) for the prediction of performance of marine propulsors (separated flows, leading edge vortex, cavitating flows, tip gap leakage flows, and 3-D boundary layer analysis on blades). Requires strong background in fluid mechanics, calculus, computer programming. Fall ’09 Opportunities in OEG:

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