1,720,965 research outputs found
Fossati F., Robustelli F., Schito P., Bertorello C., “Experimental and numerical assessment of high speed small craft aerodynamics”, HSMV2014, Naples (Italy), October 2014
No full textDrafting Effect in Cycling: Investigation by Wind Tunnel Tests
Full text linkCyclists travelling in groups experience a significant reduction in the wind resistance and those behind consume less energy due to the shielding effect of the front cyclist. We investigated drafting effects by wind tunnel tests realizing a test set-up with two cyclists pedalling at different longitudinal distance. Drag reduction effects on both the leading and the trailing cyclist are confirmed. The presence of lateral wind is also investigated showing a significant reduction of the drafting effect also for light winds
Handbike Aerodynamics: Wind Tunnel Versus Track Tests
No full textAbstractIt is well established that wind resistance is responsible for most of the metabolic cost of cycling in level ground. Aerodynamic drag is about 80% of the total resistive force in road racing at 30km/h and up 94% in time trial competitions at 50km/h, so that it becomes very important to reduce it to improve cycling performance and similarly, but less investigated, in handcycling. We have investigated handbike aerodynamics by means of wind tunnel tests to define the drag area in different athlete's positions. We found significant differences between the propulsive stage, when the athlete is pedaling and the purely aerodynamic stage, when the athlete is not pedaling and he has only to minimize his drag, as in a downward slope. Track tests are used to confirm wind tunnel data
Experimental assessment of mega-yachts aerodynamic performance and charateristcs
No full textLarger main dimensions, superior comfort requests and higher manoeuvrability characteristics focus mega-yacht designer attention towards hull and superstructure aerodynamic performances. Windage evaluation of very high superstructure, aerodynamic load assessment, and accurate air flow simulation are considered very important in the design procedure to get optimal layout and opening position. Moreover they are used to precisely evaluate thrusters and Dynamic Positioning Systems horsepower.
The lack of data concerning the peculiar mega-yacht forms and the result requested accuracy lead to set up scale model wind tunnel tests. They are asked more and more frequently by designer and surveyors and considered a fundamental reference for any further CFD simulation.
In this paper experimental methodologies developed at Politecnico di Milano Wind Tunnel in order to assess mega-yacht aerodynamics in terms of aerodynamic loads, comfort analysis, pollutants dilution and re-ingestion analysis using wind tunnel tests are described
Fossati F., Robustelli F., Schito P., Cuoci A., Derudi M., DellePiane S., “Experimental and numerical assessment of mega-yacht aerodynamic performances and characteristics”, HISWA, Amsterdam (The Netherlands), March 2014
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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