Patrick Bot
YOU?
Author Swipe
Tank Testing of a Windfoil Hydrofoil with Free Surface Effects Open
Hydrofoils used on many water crafts and boats, operate in close proximity to the free surface. While the behavior of wings in a single-fluid medium is well known, the effects of the free surface on hydrofoils are not precisely known. The …
View article: How does sailor morphology affect Olympic windfoil performance?
How does sailor morphology affect Olympic windfoil performance? Open
International audience
View article: Optimising hydrofoils using automated multi-fidelity surrogate models
Optimising hydrofoils using automated multi-fidelity surrogate models Open
Lifting hydrofoils are gaining importance, since they drastically reduce the wetted surface area of a ship, thus decreasing resistance. To attain efficient hydrofoils, the geometries can be obtained from an automated optimisation process. …
Boundary Element Method Analysis of 3D Effects and Free-Surface Proximity on Hydrofoil Lift and Drag Coefficients in Varied Operating Conditions Open
_ The use of hydrofoils to enhance ship performance raises the scientific issue of free-surface proximity, which is important to consider during the design stage, to feed velocity prediction programs, for instance. Typically, the flow over…
View article: Free-Surface Effects on Two-Dimensional Hydrofoils by RANS-VOF Simulations
Free-Surface Effects on Two-Dimensional Hydrofoils by RANS-VOF Simulations Open
Foiling yachts and crafts are both very sensitive to the flying height in terms of stability and performance, raising the scientific issue of the influence of the free-surface when the foil is at low submergence. This work presents numeric…
View article: Hydrofoil Optimization via Automated Multi-Fidelity Surrogate Models
Hydrofoil Optimization via Automated Multi-Fidelity Surrogate Models Open
Lifting hydrofoils are gaining importance, since they drastically reduce the wetted surface area of a ship hull, thus decreasing resistance.To attain efficient hydrofoils, the geometries can be obtained from an automated optimization proce…
View article: Free-Surface Effects on Two-Dimensional Hydrofoils by RANS-VOF Simulations
Free-Surface Effects on Two-Dimensional Hydrofoils by RANS-VOF Simulations Open
Foiling yachts and crafts are both very sensitive to the flying height in terms of stability and performance, raising the scientific issue of the influence of the free-surface when the foil is at low submergence. This work presents numeric…
View article: Free-Surface Effects on Two-Dimensional Hydrofoils by RANS-VOF Simulations
Free-Surface Effects on Two-Dimensional Hydrofoils by RANS-VOF Simulations Open
International audience
View article: Turbulent flow around circular arcs
Turbulent flow around circular arcs Open
The flow around a circular arc is governed by the effect of the sharp leading edge and the arc's curvature. There is a range of incidences where a leading-edge separation bubble (LESB) is formed on the convex side of the arc, and the reatt…
View article: Wind-tunnel pressure measurements on model-scale rigid downwind sails
Wind-tunnel pressure measurements on model-scale rigid downwind sails Open
This paper describes an experiment that was carried out in the Twisted Flow Wind Tunnel at The University of Auckland to measure a detailed set of pressure distributions on a rigid 1/15th scale model of a modern asymmetric spinnaker. It wa…
View article: Aerodynamics of a highly cambered circular arc aerofoil : experimental investigations
Aerodynamics of a highly cambered circular arc aerofoil : experimental investigations Open
While the aerodynamics of upwind sails are relatively well understood, flows past downwind sails are still very challenging. Indeed, downwind sails which can be considered as highly cambered thin wing profiles, are well known for their mas…
Sail trimming FSI simulation - Comparison of viscous and inviscid flow models to optimise upwind sails trim Open
A numerical comparison between two FSI models, based on inviscid and viscous flow solvers, is presented in this paper. The differences between aerodynamic coefficients, sail flying shape and pressures computed by both FSI tools are investi…
Fluid Structure Interaction of Yacht Sails in the Unsteady Regime Open
The dynamic Fluid Structure Interaction (FSI) of yacht sails submitted to a harmonic pitching motion is numerically investigated to address both issues of aerodynamic unsteadiness and structural deformation. The model consists in an implic…
View article: Numerical study of a flexible sail plan : effect of pitching decomposition and adjustments
Numerical study of a flexible sail plan : effect of pitching decomposition and adjustments Open
A numerical investigation of the dynamic Fluid Structure Interaction (FSI) of a yacht sail plan submitted to harmonic pitching is presented to analyse the effects of motion simplifications and rigging adjustments on aerodynamic forces. It …
View article: Experimental validation of unsteady models for wind / sails / rigging fluid structure interaction
Experimental validation of unsteady models for wind / sails / rigging fluid structure interaction Open
The aim of this paper is to present the work of experimental validation elements of the aero elastic and unsteady model ARAVANTI. Numerical and Experimental results comparison is made on the rigging and sails of a J80 sail boat. Yacht mode…
On the Effect of the Leading-Edge Separation Bubble on the Aerodynamics of Spinnakers Open
The spinnaker is the most powerful and one of the most used sails both in racing and cruising - yet its complex aerodynamics governed by flow separation is still not fully understood. While the flow around a spinnaker is unsteady and highl…
High Froude Number Experimental Investigation of the 2 DOF Behavior of a Multihull Float in Head Waves Open
Dynamic Velocity Prediction Programs are taking an increasingly prominent role in high performance yacht design, as they allow to deal with seakeeping abilities and stability issues. Their validation is however often neglected for lack of …
CHARACTERIZATION OF A FLOW SEPARATION SENSOR ON A HYDROFOIL: THE HYDRO E-TELLTALE Open
The performance of lifting bodies such as hydrofoils is determined by the flow state and particular attention should be paid to flow separation, as this greatly affects the generated lift and drag. Sailors are used to look at telltales (wo…
High Froude Number Experimental Investigation of the 2DOF Behavior of a Multihull Float in Head Waves Open
Dynamic Velocity Prediction Programs are taking an increasingly prominent role in high performance yacht design, as they allow to deal with seakeeping abilities and stability issues. Their validation is however often neglected for lack of …
Vortex Induced Vibration Analysis of a Cantilevered Hydrofoil by Laser Vibrometry and TR-PIV Open
The structural response of a steel cantilevered hydrofoil is analyzed through an experiment carried out in a hydrodynamic tunnel for Reynolds numbers ranging from 2 105 to 8:25 105. The hydrofoil is set at a 17 angle to the flow direction,…
Force Variations Related to Flow Pattern Changes Around a High-Camber Thin Wing Open
The aim of this paper is to report and analyze experimental results on forces generated by a high-camber thin section with a sharp leading edge, namely a curved plate with 22.3% relative camber, and measurements of the flow field, in a nom…
Flow field and forces on a highly curved plate Open
While both slender wings and bluff bodies are the usual focus of classical fluid dynamics, the behavior of a high-lift not-so-slender body remains somehow original. This work presents an experimental investigation of a high-camber curved t…
6DOF behavior of an offshore racing trimaran in an unsteady environment Open
While in recent years the use of hydrofoils has experienced a substantial growth, traditional design tools such as Velocity
\nPrediction Programs (VPP) have proven inadequate to help architects and engineers with performance trade offs whi…
Sharp Transition in the Lift Force of a Fluid Flowing Past Nonsymmetrical Obstacles: Evidence for a Lift Crisis in the Drag Crisis Regime Open
Bluff bodies moving in a fluid experience a drag force which usually increases with velocity. However in a particular velocity range a drag crisis is observed, i.e., a sharp and strong decrease of the drag force. This counterintuitive resu…