| Download | - View final version: Preliminary investigation of the impact of precipitation on the aerodynamics of road vehicles (PDF, 1.0 MiB)
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| DOI | Resolve DOI: https://doi.org/10.4224/40002955 |
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| Author | Search for: Raeesi, Arash1; Search for: McAuliffe, Brian R.1 |
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| Affiliation | - National Research Council of Canada. Aerospace
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| Format | Text, Technical Report |
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| Physical description | 44 p. |
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| Abstract | Road vehicles in the real world experience aerodynamic conditions that are often omitted in wind-tunnel or numerical simulations. Precipitation can potentially have an impact on the aerodynamics of road vehicles. This report is a first step towards gathering the knowledge required for developing methodologies to assess the aerodynamics of road vehicles under precipitation conditions. A majority of the available literature has been dedicated to aviation applications, with little work done on how precipitation influences aerodynamic performance. A review of experimental and numerical approaches to assess precipitation impacts to the aerodynamic performance of aircraft has provided an essential foundation for assessment of road vehicles since the mechanisms of interaction are presumed to be similar. For aircraft wings, rain can impact the aerodynamics by three different mechanisms: the exchange of momentum between rain droplets impacting the surface of the wing; momentum loss and subsequent deceleration of the boundary-layer flow due to acceleration of rain particles and splash-back of particles; and added surface roughness due to uneven distribution of a thin water film forming on the surface. It is expected that these three mechanisms are all present in the case of a road vehicle, but their relative magnitudes are likely different. Recommendations are provided for assessing rain-induced drag of road vehicles using both experimental and numerical techniques. |
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| Publication date | 2020-07-28 |
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| Publisher | National Research Council of Canada. Aerospace |
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| Series | |
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| Language | English |
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| Peer reviewed | No |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 96b636f4-be79-4e33-9268-6682967f54e8 |
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| Record created | 2022-11-08 |
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| Record modified | 2022-11-08 |
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