Numerical Investigation of Road Vehicle Aerodynamics Using the Immersed Boundary RANS Approach

2005 ◽  
Author(s):  
Shailesh Jindal ◽  
Bahram Khalighi ◽  
Gianluca Iaccarino
Keyword(s):  
Numerical Investigation ◽  
Immersed Boundary ◽  
Road Vehicle ◽  
Vehicle Aerodynamics

Computational Evaluation of a Novel Aerodynamic Road Vehicle Design and Drag Reduction Using Vortex Generators

2019 ◽  
Author(s):  
B. B. Arora ◽  
Ujjwal Suri ◽  
Utkarsh Garg ◽  
Shraman Das ◽  
Sushrut Kumar
Keyword(s):  
Drag Reduction ◽  
Fuel Efficiency ◽  
Vortex Generators ◽  
Vehicle Design ◽  
Design Data ◽  
Road Vehicle ◽  
Pressure Drag ◽  
Computational Evaluation ◽  
Vehicle Aerodynamics ◽  
Dynamics Simulations

Abstract Vehicle aerodynamics is a prime domain of research and development. Multiple active and passive aerodynamic systems have been applied for its enhancement. The reduction of drag plays a pivotal role in the improvement of vehicle aerodynamic performance. The present paper studies the innovative design of a road vehicle for a fuel efficiency challenge, implemented for optimal drag reduction. Vortex generators are utilized as a passive aerodynamic feature for further minimization of the wake region size and reduction of pressure drag. High fidelity computational fluid dynamics simulations were applied for the evaluation of this design. Data was collated from simulations for both the cases, with and without the usage of vortex generators and compared objectively. The results of the study establish that the vehicle design has an exceptionally low drag coefficient. It also exhibits a strong reduction in drag when the vortex generators are fitted. These results reveal that the design can be deployed for production as a worthy competition vehicle.

Numerical Investigation of Interaction of Counter Flow Jet and Hypersonic Capsule Flow Via Modified DsmcFoam

2019 ◽  
Vol 141 (10) ◽  
Author(s):  
Mostafa Raeisi ◽  
Meysam Mohammadi-Amin ◽  
Ramin Zakeri
Keyword(s):  
Numerical Investigation ◽  
Test Cases ◽  
Interaction Patterns ◽  
Counter Flow ◽  
Collision Model ◽  
Density Reduction ◽  
Flow Interaction ◽  
Vehicle Aerodynamics ◽  
Model Adjustment ◽  
Adaptive Grid Generation

Abstract In this work, numerical investigation of interaction of counter flow jet and hypersonic re-entry capsule flow has been carried out through modification of DsmcFoam solver. The DsmcFoam modification includes implementation of variable soft sphere (VSS) collision model for more accurate collision model, adjustment of nonuniform initial condition for faster convergence and nonuniform boundary condition, calculation of local Knudsen number in postprocessing for adaptive grid generation, and implementation of different gas species for multigas flow interaction simulations. Therefore, the modified DsmcFoam can be used for investigation of the effect of counter flow jet on the vehicle aerodynamics and aerothermodynamics. New validation test cases from Von Karman gas dynamics facility (VKF) tunnel data of Apollo and blunt-cone re-entry geometries are studied via DsmcFoam in which a suitable agreement of results is observed compared to experimental data and also MONACO code computations. Also, the influence of counter flow jet has been presented, i.e., changing of bow shock configuration and its distance from the vehicle. Consequently, it is observed that by increasing counter flow jet velocity or density, reduction of the drag coefficient and heat flux on the vehicle will occur. Furthermore, variation of the velocity or density of counter flow jet leads to different jet-flow interaction patterns which are presented evidently.

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