Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Impact of a nearby car on the drag of a cyclist
https://orcid.org/0000-0003-2935-9562
https://orcid.org/0000-0002-6525-5392
Abstract Cycling races contain a multitude of cars including team cars. During parts of the race, the cyclists can ride in close proximity of these cars. An earlier study indicated that there is a drag reduction for a cyclist by a following car. However, to the best of our knowledge, there is no information in the scientific literature about the impact of a car on cyclist drag when the cyclist is positioned either in-line behind the car or in parallel or staggered position with the car. This paper presents wind tunnel measurements and CFD simulations of cyclist drag for 29 different cyclist-car arrangements. It is shown that drafting in-line behind a car at a distance of 10 and 40 m leads to substantial drag reductions of about 20 and 7%, respectively. The staggered positions can lead to either a large drag increase up to almost 9% or a moderate drag decrease up to 1.4%. These drag changes can induce time gains or losses that go up to several seconds per kilometre, which is large enough to potentially influence the outcome of cycling races.
Highlights Drafting in-line at a 10 and 40 m behind a car gives drag reductions of about 20 and 7%. Drafting parallel to a car at lateral distance gives drag increase of up to 9%. These percentages gives several seconds time gain or loss per kilometre. These time gains or losses can potential influence the outcome of cycling races.
Impact of a nearby car on the drag of a cyclist
https://orcid.org/0000-0003-2935-9562
https://orcid.org/0000-0002-6525-5392
Abstract Cycling races contain a multitude of cars including team cars. During parts of the race, the cyclists can ride in close proximity of these cars. An earlier study indicated that there is a drag reduction for a cyclist by a following car. However, to the best of our knowledge, there is no information in the scientific literature about the impact of a car on cyclist drag when the cyclist is positioned either in-line behind the car or in parallel or staggered position with the car. This paper presents wind tunnel measurements and CFD simulations of cyclist drag for 29 different cyclist-car arrangements. It is shown that drafting in-line behind a car at a distance of 10 and 40 m leads to substantial drag reductions of about 20 and 7%, respectively. The staggered positions can lead to either a large drag increase up to almost 9% or a moderate drag decrease up to 1.4%. These drag changes can induce time gains or losses that go up to several seconds per kilometre, which is large enough to potentially influence the outcome of cycling races.
Highlights Drafting in-line at a 10 and 40 m behind a car gives drag reductions of about 20 and 7%. Drafting parallel to a car at lateral distance gives drag increase of up to 9%. These percentages gives several seconds time gain or loss per kilometre. These time gains or losses can potential influence the outcome of cycling races.
Impact of a nearby car on the drag of a cyclist
https://orcid.org/0000-0003-2935-9562
https://orcid.org/0000-0002-6525-5392
Abstract Cycling races contain a multitude of cars including team cars. During parts of the race, the cyclists can ride in close proximity of these cars. An earlier study indicated that there is a drag reduction for a cyclist by a following car. However, to the best of our knowledge, there is no information in the scientific literature about the impact of a car on cyclist drag when the cyclist is positioned either in-line behind the car or in parallel or staggered position with the car. This paper presents wind tunnel measurements and CFD simulations of cyclist drag for 29 different cyclist-car arrangements. It is shown that drafting in-line behind a car at a distance of 10 and 40 m leads to substantial drag reductions of about 20 and 7%, respectively. The staggered positions can lead to either a large drag increase up to almost 9% or a moderate drag decrease up to 1.4%. These drag changes can induce time gains or losses that go up to several seconds per kilometre, which is large enough to potentially influence the outcome of cycling races.
Highlights Drafting in-line at a 10 and 40 m behind a car gives drag reductions of about 20 and 7%. Drafting parallel to a car at lateral distance gives drag increase of up to 9%. These percentages gives several seconds time gain or loss per kilometre. These time gains or losses can potential influence the outcome of cycling races.
Impact of a nearby car on the drag of a cyclist
Blocken, Bert (Autor:in) / Gillmeier, Stefanie (Autor:in) / Malizia, Fabio (Autor:in) / van Druenen, Thijs (Autor:in)
09.02.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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