Method for the expansion of sailing yacht model data to full scale

This report presents the method used at the Institute for Marine Dynamics for expanding sailing yacht model data to full scale. The stripping method appropriate for scaling of sailing yachts data is described. Formula for estimating viscous drag are presented.NRC publication: Ye

Preliminary CFD Study of Model Induced Circulation in the IMD Clearwater Towing Tank

It was observed when testing large models of sailing yachts in the NRC/IMD towing tank that lasting flow patterns were being produced in the tank, which could affect force measurements. Some assessments of the phenomena were made, but the nature of the flow was not well understood. Attempts to minimize the circulation effects on model testing were primarily made by trial and error. This report presents results from a preliminary CFD study (2D) of the dynamics of this induced flow.NRC publication: Ye

Analysis of rudder span effects on IMS hydrodynamic induced drag

The physical draft of keels has long been known to be critical for the upwind performance of sailboats and has long been an element of handicap rules. The IMS rule uses a relatively sophisticated algorithm for assessing keel draft yet, as is the case with other rules, has never included any influence of rudder span. However, there is considerable empirical evidence that rudders can make a significant contribution to performance by increasing the total effective draft. Tank test research was conducted to explore rudder span and quantify performance differences. The results have been incorporated into the IMS 2002 rule in a way that is intended to give some rating relief to boats with shallow rudders yet to not drive optimised design in that direction.Peer reviewed: YesNRC publication: Ye

Preliminary CFD Study of Model Induced Circulation in the IMD Clearwater Towing Tank

It was observed when testing large models of sailing yachts in the NRC/IMD towing tank that lasting flow patterns were being produced in the tank, which could affect force measurements. Some assessments of the phenomena were made, but the nature of the flow was not well understood. Attempts to minimize the circulation effects on model testing were primarily made by trial and error. This report presents results from a preliminary CFD study (2D) of the dynamics of this induced flow.NRC publication: Ye

Cooccurrence matrices of color feature vectors for multi-camera vehicle identification

International audienc

Analysis of hull shape effects on hydrodynamic drag in Offshore Handicap Racing Rules

US Sailing and the Institute for Marine Dynamics (IMD) in St. John?s, Newfoundland, are collaborating in a joint research program to investigate the effects of hull shape variations on hydrodynamic drag. The results of this program are being used to support the development of rules that handicap racing yachts. A fleet of 9 models has been designed with systematic variations in the most fundamental parameters: displacement and beam for fixed length. Six of those models have been tested both appended and bare-hull, in calm water and head seas. Analysis of residuary resistance, both upright and heeled, has been used to improve the Velocity Prediction Programs (VPPs) employed by both the International Measurement System (IMS) and AMERICAP rules.results of this program are being used to support the development of rules that handicap racing yachts. A fleet of 9 models has been designed with systematic variations in the most fundamental parameters: displacement and beam for fixed length. Six of those models have been tested both appended and bare-hull, in calm water and head seas. Analysis of residuary resistance, both upright and heeled, has been used to improve the Velocity Prediction Programs (VPPs) employed by both the International Measurement System (IMS) and AMERICAP rules.NRC publication: Ye

Physical modelling of vehicle performance in high-amplitude and high-rate manoeuvres

The disciplines of hydrodynamics and aerodynamics use similar theory and methods in experimental work on high-amplitude and high-rate manoeuvres with free-flight and free-swimming models, in analysis techniques when extracting dynamic stability derivatives from measured free trajectories and measured hydrodynamic or aerodynamic loads, and in the design of suitable control systems for such manoeuvres in up to six degrees-offreedom. Research using the NRC-IMD Marine Dynamic Test Facility (MDTF) has established new methods and standards in each of these areas. This paper outlines the relevant capabilities of MDTF and discusses some recent analyses of data from submarine model experiments.NRC publication: Ye

The NRC-IMD Marine Dynamics Test Facility: A Six-Degree-of-Freedom Forced-Motion Apparatus for Underwater Vehicle Testing

The Marine Dynamic Test Facility (MDTF) is a new experimental apparatus that is optimized for dynamically testing large underwater vehicle models well into the nonlinear regime. Its effective use requires careful experimental design and advanced methods of data analysis. This paper describes the MDTF and discusses a number of the issues for underwater vehicle testing that have been encountered during the first year since its commissioning.NRC publication: Ye

Physiomer reduces the chemokine interleukin-8 production by activated human respiratory epithelial cells.

The authors have recently shown that the transcription factor nuclear factor-kappaB (NF-kappaB) is a central mediator in the NaCl-mediated interleukin (IL)-8 production by human airway epithelial cells. In this study, it was investigated whether Physiomer, an isotonic sea water-derived solution commercialized for cleaning the nasal mucosa, impaired the chemokine IL-8 expression and secretion by human respiratory epithelial cells compared with that obtained with an isotonic 9% NaCl solution. Primary human bronchial gland (HBG) epithelial cells were incubated either in Physiomer or in a NaCl 9% solution and activated either with 20 ng x mL(-1) tumour necrosis factor-alpha, or IL-1beta, respectively. Physiomer significantly reduced the IL-8 protein release in basal and activated HBG cells in comparison with that obtained with the 9% NaCl solution. In contrast to the effects of Physiomer observed on resting HBG cells, Physiomer did not significantly reduce the level of phosphorylation of the NF-kappaB inhibitor protein IkappaBalpha or the steady-state IL-8 messenger ribonucleic acid levels in activated HBG cells, suggesting that Physiomer would have a post-transcriptional effect on IL-8 expression in activated HBG cells. The authors conclude that Physiomer is potentially useful in the reduction of airway mucosal inflammation