Smart Rivers 2011 PIANC New Orleans, LA USA. Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure Brant R. Savander, Ph.D., P.E. Principal.

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Presentation transcript:

Smart Rivers 2011 PIANC New Orleans, LA USA

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure Brant R. Savander, Ph.D., P.E. Principal Research Scientist Maritime Research Associates, LLC Ann Arbor, MI USA Gregory Lee Naval Architect Marine Design Center US Army Corps of Engineers Philadelphia, PA USA

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure Sergio Fifi Naval Architect Jensen Maritime Consultants, Inc. Johan Sperling Naval Architect Jensen Maritime Consultants, Inc.

The Application of CFD to River Towboat Design

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure 1.Hull form incorporates propeller tunnels. 2.Steering and flanking rudders ahead and aft of propeller. 3.Thrust and steering equally important in ahead and astern operation. 4.Propeller diameter limited and heavily loaded. 5.Large Variation in barge tow size gives large range of propeller operating points.

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure Steering & Flanking Rudders Strut Propeller Diameter & Tip Clearance Wake Adapted Blade Shape Wake Aligned Appendages Comparison to Z-Drives

The Application of CFD to River Towboat Design

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure 1.Wake alignment of struts and rudders. 2.Wake adapted propeller design. 3.Propeller diameter trade-off analysis: efficiency vs. pressure pulse levels. 4.Match propeller and hull to a “wide operating speed range” rated engine. 5.Evaluate maximum forces on steering and flanking rudders at hard over angles.

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure LOA: 114’-0’’ BOA: 35’-0’’ Depth: 10’-3’’ (molded) Max. Air Draft: 60’-6’’

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

The Application of CFD to River Towboat Design

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure Lateral Symmetry Bottom Boundary Velocity Inlet Pressure Outlet

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure Lateral Symmetry Bottom Boundary Velocity Inlet Free Surface

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure -7.2 o -3.3 o -5.9 o 2.3 o

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

The Application of CFD to River Towboat Design

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

The Application of CFD to River Towboat Design

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

The Application of CFD to River Towboat Design

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure 1.Inboard Flanking Rudder: LE outboard 3.3 deg. 2.Outboard Flanking Rudder: LE outboard 7.2 deg. 3.Inboard Steering Rudder: LE inboard 2.3 deg. 4.Outboard Steering Rudder: LE outboard 5.9 deg. 5.Maximum Rudder Side Force: deg. 6.Struts – Wake Aligned at ahead speed of 8.7 kts.

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure 1. Compared w/ flat face geometry a.35 % reduction in unsteady shaft thrust and torque amplitude. b.25 % reduction in radiated pressure pulse levels. c.3 % increase in openwater efficiency. d.Tip clearance reduced from 15% D to 10% D. e.Propeller diameter increase from 79’’ to 82.5’’ 2.Full 3D CNC propeller models. ABS Class.

Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure