Foiling Week™ 2015. July 1st - Presentation by Friso Bergsma: "Foil altitude control"
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Transcript of Foiling Week™ 2015. July 1st - Presentation by Friso Bergsma: "Foil altitude control"
Development of Hydrofoils and CFD tools
at Van Oossanen Naval Architects F.M.J. Bergsma, M.Sc.
About Us
Founded in 1992
Situated in Wageningen, NL
14 Crew
Fields of work:
Motor Yacht Design
Sailing Yacht Design
CFD
Consulting
Peter van Oossanen
Perry van Oossanen
Niels Moerke
About Us
• Designed and launched almost 100 vessels
• Currently 12+ yachts under construction
• 6 yachts currently under design
• Working for both Yards and Owner’s directly
Sailing Yachts
• The roots of the company are in
(racing) sailing yachts
• Naval Architecture:
• Cruising & Production
Yachts
• Super Yachts
• Traditional Dutch Sailing
Yachts
• CFD-based design optimization
• Design advice
First Swiss America’s Cup Challenger FAST 2000
Lemsteraak “BS2”
Zeydon 60, with BMW Design Group
Computational Fluid Dynamics
• Numerical Flow Simulations
• Matured rapidly over the last decade
• “Revealing what hasn’t been seen before”
• Study of the flow in great detail
Detailed CFD for 65m FDHF
CFD for 24m Semi-Displacement Motor Yacht
CFD based design optimization for 120m Coaster
Motor Yachts
• The majority of the projects are
concerned with motor yachts
• Naval Architecture:
• Super Yachts
• Platform Development
• Small (Production) Yachts
• Fast Tenders
• CFD-based design optimization
• Optimization of propulsive efficiency
9.5m Tender, 12 persons
50m Motor Yacht “Satori”
Galactica Star
Hull Vane®
• Fixed foil below stern
• Resistance reducing
• Up to 25% reduction
• Provides forward thrust
• Corrects trim
• Sister company of Van Oossanen
Hull Vane on Le Defi Areva, America’s Cup 2003
Hull Vane on Crew supply vessel Karina, 2014
Introduction - Outline
• Development of Hull Vane®
• Development process
• Working principle
• Results
• CFD of transition to foiling mode
• CFD method
• Control strategy
• Results
• Summary
Hull Vane - Development Process
Hull Vane - Development Process
Hull Vane - Development Process
Hull Vane – Working principles
• Thrust force
• Trim correction
• Wave reduction
• Reduction of motions in waves
Hull Vane - Working principles
Hull Vane - Working principles
Hull Vane - Working principles
Hull Vane - Working principles
Hull Vane - Working principles
Hull Vane - Working principles
Hull Vane - Working principles
Hull Vane - Working principles
Hull Vane - Working principles
Hull Vane - Working principles
Hull Vane - Working principles
Hull Vane - Working principles
Hull Vane - Working principles
Hull Vane - Results
• CFD computations
• Done by Van Oossanen Naval Architects
• FINE/Marine CFD package
• Model tests
• MARIN, the Netherlands
• Wolfson Unit, UK
• Full-scale sea trials
• 55 metre Fast Supply Intervention Vessel
• 42 metre Motor Yacht
• Rijnborg:
• Scope
• CFD
• Model testing
• Resistance reductions
• 10.1% at 17 kn.
• 15.5% at 21 kn.
• Higher resistance
reductions in waves
Hull Vane - Results
Hull Vane - Results
• Karina:
• Scope
• CFD
• Model testing
• Sea trials
• Resistance reduction
• 12-15% at 12-20 kn.
Results – Hull Vane
CFD - Introduction
CFD - Introduction
CFD - Introduction
CFD - Introduction
CFD - Method
• FINE/Marine (Numeca)
• Incompressible RANSE solver ISIS
• Menter-SST turbulence model
• Unstructured hexahedral mesh
• Vessel is free to trim and rise
• Sliding grids
• Adaptive grid refinement (AGR)
CFD - Method
• Sliding grids
CFD - Method
• Adaptive Grid Refinement (AGR)
CFD - Method
• Adaptive Grid Refinement (AGR)
CFD - Control strategy
𝑑𝑒𝑠𝑖𝑟𝑒𝑑 𝑟𝑖𝑑𝑒 ℎ𝑒𝑖𝑔ℎ𝑡
𝑅𝑖𝑠𝑒 error
− 𝐾𝒑 𝑒𝑟𝑟𝑜𝑟
𝐾𝒊 𝑒𝑟𝑟𝑜𝑟𝑡
0
+
𝐹𝑜𝑖𝑙 𝑝𝑖𝑡𝑐ℎ 𝑎𝑛𝑔𝑙𝑒
𝐏𝐫𝐨𝐩𝐨𝐫𝐭𝐢𝐨𝐧𝐚𝐥
C𝐮𝐦𝐦𝐮𝐥𝐚𝐭𝐢𝐯𝐞
CFD - Results
CFD - Rise & Trim
CFD - Error on rise
CFD - Pitch angles
CFD - Lifting force
Summary
• Hull Vane
• Corrects trim
• Provides forward thrust
• Reduces resistance
• Simulation of transition to foiling mode
• RANSE based CFD analysis
• FINE/Marine
• Adaptive Grid Refinement
• Sliding grids
• Ride height control
• Control strategy for pitch of foils
visit & mail us: contact us: follow us:
Costerweg 1B T +31 (0) 317 451573 www.oossanen.nl
6702 AA, Wageningen [email protected] @oossanen
The Netherlands