Car accident simulation to make cars safe
In order to prevent these accidents, experts recommend installing windshields or taking traffic control measurements to protect cars from high-speed crosswinds. Such as, on August 11, 2004, seven moving cars on the Chinese Humen Suspension Bridge were swayed by crosswind. Traffic accidents can cause casualties, traffic jams, and economic losses. Over the past few decades, many car accidents have been caused by crosswind gusts. With the construction of more and more sea crossing bridges around the world, this problem seems more important now. Thus, the car will have more unstable behavior. A more fuel-saving design moves the pressure center forward, which makes a car more likely to deviate from its original path. It may produce a yaw moment that tends to rotate the car. A crosswind will produce high pressure on the windward side and low pressure on the leeward side of a car, especially in the front. In recent car designs, the light weight car and aerodynamic drag have been highly emphasized in order to a better fuel economy.
#Car accident simulation to make cars safe drivers
As a result, the cars may deviate from their original route, and the drivers may have to manipulate their steering wheels to keep the cars running straight. The cars’ driving states will be interfered by the crosswinds, which may produce a side lurching, cross velocity, and yaw velocity. High-speed cars are always affected by the natural crosswinds when they are meeting trucks, driving out of a tunnel, and passing a bridge. The research results of this paper will provide reference for the optimal design of bridge guardrail. The study shows that, in order to ensure the safety of cars on the bridge, the bridge guardrail porosity should be small, 35.8% is more suitable, the guardrail height should be more suitable within the range of 1.5–1.625 meters, and the Reynolds number should not be 3.51 e + 5. The influence of factors such as the porosity and height of the bridge guardrail and the Reynolds number of airflow on the flow field characteristics is analyzed. The numerical simulation model is established by referring to the Donghai Bridge, and the correctness of the car model is validated by combining with the data of wind tunnel test. In this paper, the large eddy simulation method is used to study the flow field characteristics and safety of the car on the bridge under the turbulent crosswind. As more long-span bridges continue to be completed and opened to traffic, the safety of cars driving across the bridge has attracted more and more attention, especially when the car is suddenly affected by the crosswind, the car is likely to have direction deviation or even a rollover accident.