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 info@oossanen.nl @oossanen

The Netherlands