Smart Rivers 2011 PIANC New Orleans, LA USA THE APPLICATION OF COMPUTATIONAL FLUID DYNAMICS (CFD) TO RIVER TOWBOAT DESIGN
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1 Smart Rivers 2011 PIANC New Orleans, LA USA THE APPLICATION OF COMPUTATIONAL FLUID DYNAMICS (CFD) TO RIVER TOWBOAT DESIGN
2 Authors: 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 Acknowledgements: 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 OVERVIEW
5 USACE Towboat Example: EVANICK
6 Towboat Design Attributes & Challenges 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 USACE: 114-ft, 1500-hp per shaft 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 USACE 114-FT TOWBOAT APPLICATION
9 Design & Analysis Objectives: 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 Outboard Profile LOA: BOA: 35-0 Depth: 10-3 (molded) Max. Air Draft: 60-6
11 General Arrangement
12 The Application of CFD to River Towboat Design NUMERICAL TOWING TANK FULL SCALE
13 Computational Geometry
14 Computational Domain: Full Scale Tank Pressure Outlet Lateral Symmetry Bottom Boundary Velocity Inlet
15 Computational Domain: Full Scale Tank Free Surface Velocity Inlet Lateral Symmetry Bottom Boundary
16 Rudder and Propeller Mesh
17 Rudder and Propeller Mesh
18 Results: Full Resolution of Pressure Field
19 Results: Full Resolution of Velocity Field -7.2 o -5.9 o 2.3 o -3.3 o
20 Stock Appendages: Axial Velocity
21 Wake Adapted App.: Axial Velocity
22 The Application of CFD to River Towboat Design USACE TOWBOAT PROPELLER
23 Propeller Drawing
24 Propeller Distributions
25 The Application of CFD to River Towboat Design RUDDER ANGLE VARIATION
26 Example: Steering Rudders 20 deg.
27 Free Surface: Steering 20-deg
28 Streamlines: Steering 20-deg
29 Steering Angle Force Summary
30 Flanking Rudder Angle Force Summary
31 The Application of CFD to River Towboat Design RESULTS & CONCLUSIONS
32 Results: Struts & Rudders 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.
33 Results: Propeller 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 Full 3D CNC propeller models. ABS Class.
34 Closure Thank You.
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