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Computational Fluid Dynamics. Paul Bogataj Joe Laiosa Paul H. Miller. 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 as a Design Tool.

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## Computational Fluid Dynamics

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**Computational Fluid Dynamics**Paul Bogataj Joe Laiosa Paul H. Miller CFD @ IBEX 2003**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**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**Fluid/Structure Interaction**• A combination of fluid dynamics for the loads and finite element analysis for the structural response CFD @ IBEX 2003**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**Where to Get More Training**• Undergraduate and graduate courses • University extension short courses • Short courses by software vendors • Independent designers/consultants CFD @ IBEX 2003**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**Fluid Dynamic Theory**• Mathematical model of flow • Basic aerodynamic concepts CFD @ IBEX 2003**3-D Geometry**CFD @ IBEX 2003**Panel networks for PANAIR analysis**CFD @ IBEX 2003**Keel to bulb intersection paneling**CFD @ IBEX 2003**Winglet to bulb intersection paneling**CFD @ IBEX 2003**Winglet tip paneling**CFD @ IBEX 2003**PANAIR results, alpha = 0 degrees**CFD @ IBEX 2003**PANAIR results, alpha = 4 degrees**CFD @ IBEX 2003**Validation**• Compare to experimental data to verify computational results • Determine how to apply methods • Panel density • Wakes • Boundary conditions • Assess limitations CFD @ IBEX 2003**3-D Example: Study of keel taper affects**CFD @ IBEX 2003

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