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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 on theme: "Smart Rivers 2011 PIANC New Orleans, LA USA. Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure Brant R. Savander, Ph.D., P.E. Principal."— Presentation transcript:

1 Smart Rivers 2011 PIANC New Orleans, LA USA

2 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

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

4 The Application of CFD to River Towboat Design

5 Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

6 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.

7 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

8 The Application of CFD to River Towboat Design

9 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.

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

11 Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

12 The Application of CFD to River Towboat Design

13 Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

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

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

16 Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

17 Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

18 Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

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

20 Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

21 Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

22 The Application of CFD to River Towboat Design

23 Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

24 Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

25 The Application of CFD to River Towboat Design

26 Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

27 Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

28 Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

29 Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

30 Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

31 The Application of CFD to River Towboat Design

32 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: 40-45 deg. 6.Struts – Wake Aligned at ahead speed of 8.7 kts.

33 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.

34 Overview114-ft TowboatNumerical Towing TankPropellerRudder AOAClosure

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