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Computational Fluid Dynamics

Computational Fluid Dynamics

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Computational Fluid Dynamics

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  1. Computational Fluid Dynamics Paul Bogataj Joe Laiosa Paul H. Miller CFD @ IBEX 2003

  2. Presentation Outline • Paul Miller • Introductions • CFD in the design arena • Paul Bogataj • CFD Theory • 2-D and 3-D inviscid applications • Joe Laiosa • Viscous 2-D and 3-D • Free-surface applications CFD @ IBEX 2003

  3. CFD as a Design Tool • Structural analysis, finding pressures and surface elevations • Performance analysis, more accurate than generic VPP’s, faster and less expensive than tank or wind tunnel testing, but not as accurate in some situations CFD @ IBEX 2003

  4. Fluid/Structure Interaction • A combination of fluid dynamics for the loads and finite element analysis for the structural response CFD @ IBEX 2003

  5. A Simple Example • Resistance of a sailboat hull, upright with no yaw. • The solid line represents the CFD prediction. • The “square” data points represent corresponding tank tests. CFD @ IBEX 2003

  6. Where to Get More Training • Undergraduate and graduate courses • University extension short courses • Short courses by software vendors • Independent designers/consultants CFD @ IBEX 2003

  7. Paul Bogataj • BS in Aerospace Engineering, Univ. of Washington • Boeing designer for 11 years • North American Champion, El Toro Class (foils and rig design) • Appendage and rig designer for every America’s Cup since 1992 • Currently working on appendage designs for four clients CFD @ IBEX 2003

  8. Fluid Dynamic Theory • Mathematical model of flow • Basic aerodynamic concepts CFD @ IBEX 2003

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  33. 3-D Geometry CFD @ IBEX 2003

  34. Panel networks for PANAIR analysis CFD @ IBEX 2003

  35. Keel to bulb intersection paneling CFD @ IBEX 2003

  36. Winglet to bulb intersection paneling CFD @ IBEX 2003

  37. Winglet tip paneling CFD @ IBEX 2003

  38. PANAIR results, alpha = 0 degrees CFD @ IBEX 2003

  39. PANAIR results, alpha = 4 degrees CFD @ IBEX 2003

  40. CFD @ IBEX 2003

  41. Validation • Compare to experimental data to verify computational results • Determine how to apply methods • Panel density • Wakes • Boundary conditions • Assess limitations CFD @ IBEX 2003

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  47. 3-D Example: Study of keel taper affects CFD @ IBEX 2003

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