Wind load under high-speed car aerodynamic CFD
|School||Nanjing University of Technology and Engineering|
|Course||Vehicle Operation Engineering|
|Keywords||Car Wind load Mesh generation Aerodynamic characteristics Numerical Simulation CFD Traffic safety|
With the advances in automotive technology and the continuous development of the highway , the vehicle speed has been significantly improved. The car in the convenience and comfort to people at the same time , also has security implications . High-speed car rollover occurred easily in a variety of complex weather conditions , collisions and other traffic accidents , resulting in significant casualties and property losses . Therefore, high-speed car as the research object , its study commenced the aerodynamic characteristics CFD wind loads . Certain simplifications and assumptions made ??on the basis of analysis of the automotive aerodynamic characteristics of a certain type of car , to establish the physical and mathematical model , given a description of the auto flow field around a three-dimensional turbulent flow the incompressible NS equations , and select a suitable turbulence model ; discretization of the governing equations using finite volume method . On the basis of the assumptions and simplifications , the use of CATIA software 3D car model for numerical simulation . Mesh generation technology , for car shape complexity , using hybrid mesh generation technology , namely in the area of complex shape using unstructured grid , using structured grid in the area of the shape rules . Taking into account the movement of the car to explore the dynamic mesh and sliding mesh , and by comparing the dynamic mesh to simulate car motion law . The the FLUENT software interface , using C language UDF program , the law of motion of the car . Using FLUENT software the car bicycle ride and the car will process the numerical simulation , no wind , vertical wind , five lateral wind conditions automotive outflow of pressure and velocity distribution , and analysis of the different wind loads traffic safety when traveling on the car bicycle and the car will be . The results show that the effect of the lateral wind will be subject to lateral forces and the role of the roll moment , when driving of the high - speed car cycling ; car will travel , due to wind load and the presence of interference with a vehicle , the vehicle will be subject to the direction and size . yaw moment and roll moment of change over time , prone to rollover , caused a great deal of impact on traffic safety . This article is wind load under high - speed car car will provide an effective way , research on in-depth study of high-speed car traffic safety , has important theoretical significance and reference value .