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Based on computational fluid dynamics (CFD), unsteady flow fields around automobile were simulated by adopting technology of dynamic mesh. According to the distribution of the pressure fields, the influences of the flow field on the aerodynamic forces were analyzed. The trends and reasons of aerodynamic force changing were obtained from the flow field of simulation results. The quantificational changing...
The aerodynamic problem is associated with the shape of the forebody and afterbody of a passenger car. The finite volume method is used to discrete the governing equations, the second-order up wind difference scheme is adopted for the convection term and the centric difference scheme for the dissipation term. The comparison of pressures nephogram and velocity nephogram are presented among nine rear...
Computational Fluid Dynamics (CFD) is used for the investigation of the pressure wave. This paper analyzes the formation of pressure wave. The simulation model of pressure wave is established based on three-dimensional, unsteady, viscous Reynolds averaged equations and the k-ε two-equation turbulence model, by using dynamic grid finite volume method, the pressure wave produced when train with different...
Taking CFD software as the platform and the car as the research object, the air's resistance coefficients and speed are solved by using RNG k-ε equations and dynamic mesh method. The finite volume method is used to discrete the governing equations, the second-order up wind difference scheme is adopted for the convection term and the centric difference scheme for the dissipation term. The discretion...
Computational Fluid Dynamics (CFD) is used for the investigation of the piston wind. This paper analyzes the formation of piston wind. The simulation model of piston wind is established based on the analysis of the the air flow in the subway tunnel and the production mechanism of piston wind. Simulation results by fluent software indicates that it is consistent with the experimental one. It notes...
The simulation model of hydraulic shockwave is established based on the analysis of the hydraulic oil flow in the pipe and the production mechanism of hydraulic shock. Simulation results by fluent software indicate that it is consistent with the experimental one. It notes the virtual result is trustworthy and numerical simulation of hydraulic shock waves is feasible using dynamic grid in CFD software,...
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