基于Fluent软件和Matlab软件构建汽车空气动力学和汽车系统动力

Construction and Matlab software Fluent Dynamics software bidirectionally coupled aerodynamics and automotive systems based on numerical simulation. Carried out using a wind tunnel test at cycling overtaking accuracy and without wind, verification of Numerical Simulation bidirectional coupling. By bidirectional coupler simulation, numerical simulation crosswind and will overtaking vehicle process. Transient sports car custom function by binding Fluent movable grid technology, large eddy simulation simulation, two-way data exchange is coupled by way of a shared database. Changes in wind direction and wind velocity, to study the effect of wind on the side and the car will overtake the process of aerodynamic stability of the vehicle. On this basis, considering driver model, vehicle distance and vehicle affect two other factors on the stability of the vehicle crosswind. The results can provide a reference in a crosswind safe driving environment, it can also provide a theoretical basis for intelligent control and traffic safety research vehicle systems for the driver.

Based on Fluent software and Matlab software, a two-way coupling numerical simulation method for automotive aerodynamics and automotive system dynamics is constructed. The test of overtaking under single-vehicle and wind-free conditions was carried out by using the wind tunnel laboratory to verify the correctness of the two-way coupling numerical simulation method. Through the two-way coupling simulation method, the numerical simulation of the overtaking and train process in the side wind environment is carried out. The transient motion of the automobile is realized by the combination of fluent custom function and dynamic mesh technology, and the simulation method adopts the large vortex simulation method to realize the two-way coupling data exchange by sharing the database. Change the lateral wind speed and wind direction, study the side wind on the overtaking and vehicle process aerodynamic stability. On this basis, the influence of driver model, two-car spacing and model factors on the stability of vehicle side wind is considered. The results can provide a reference for drivers to drive safely in sidewind environment, as well as theoretical basis for the study of intelligent control and traffic safety system of automobiles.

Based on FLUENT software and MATLAB software, a two-way coupling numerical simulation method of vehicle aerodynamics and vehicle system dynamics is constructed. In order to verify the correctness of the two-way coupling numerical simulation method, the single car and windless overtaking tests were carried out in the wind tunnel laboratory. Through the two-way coupling simulation method, the numerical simulation of overtaking and passing in crosswind environment is carried out. The transient motion of the vehicle is realized by fluent self defining function and dynamic grid technology. The large eddy simulation method is used to realize bidirectional coupling data exchange by sharing database. By changing the crosswind speed and direction, the influence of crosswind on the vehicle aerodynamic stability during overtaking and passing is studied. On this basis, the influence of driver model, distance between two vehicles and vehicle type on vehicle crosswind stability is considered. The research results can provide a reference for the driver to drive safely in the crosswind environment, and also provide a theoretical basis for the research of intelligent control and traffic safety system.<br>