Aerodynamics of a generic ground transportation system : Detached eddy simulation

The present study is aimed at studying the use of Detached Eddy Simulation (DES) in simulating truck aerodynamics. A computational procedure based on DES implemented within the Finite Volume Method (FVM) framework is developed. Detailed descriptions of various aspects of the procedure are provided here including mesh generation, solution procedure and post-processing guidelines. The computational procedure is applied to study aerodynamics of a generic Ground Transportation System (GTS) at 0° yaw. This is a largely simplified 1/8 th scale model of a tractor-trailer truck. Time-average and transient surface pressures, skin friction coefficients, and wake velocity structures are reported. To assess the accuracy of the present procedure, these are compared with corresponding experimental data reported in literature. Such comparison shows that the present procedure predicts drag coefficient accurately well within the bounds of experimental uncertainty. Time-average surface pressure predictions show similar bounds of accuracy at most locations on the vehicle. Furthermore, results from the DES simulation are compared with a separately conducted RANS (Reynolds Averaged Navier-Stokes) simulation to compare and contrast the accuracy of these two computational approaches.

[1]  W. Cabot.  Large-eddy simulations with wall models , 1995 .

[2]  Ashok Khondge,et al.  Simulation of the Flow-Field Around a Generic Tractor-Trailer Truck , 2004 .

[3]  Philippe R. Spalart,et al.  The Status of Detached-Eddy Simulation for Bluff Bodies , 2004 .

[4]  S. Patankar.  Numerical Heat Transfer and Fluid Flow , 2018, Lecture Notes in Mechanical Engineering.

[5]  Bahram Khalighi,et al.  Transient Simulation of the Flow Field Around a Generic Pickup Truck , 2003 .

[6]  P. Spalart.  Strategies for turbulence modelling and simulations , 2000 .

[7]  Lars Davidson,et al.  Numerical Study of the Flow Around a Bus-Shaped Body , 2003 .

[8]  P. Spalart.  Comments on the feasibility of LES for wings, and on a hybrid RANS/LES approach , 1997 .

[9]  Christopher J. Roy,et al.  RANS simulations of a simplified tractor/trailer geometry. , 2006 .

[10]  B. Launder,et al.  The numerical computation of turbulent flows , 1990 .

[11]  D. Cokljat,et al.  DES of turbulent flow over an airfoil at high incidence , 2002 .

[12]  H. Werner,et al.  Large-Eddy Simulation of Turbulent Flow Over and Around a Cube in a Plate Channel , 1993 .

[13]  W. Cabot,et al.  Near-Wall Models in Large Eddy Simulations of Flow Behind a Backward-Facing Step , 1996 .

[14]  Manuel García-Villalba,et al.  Large eddy simulation of flow around the Ahmed body , 2004 .

[15]  R Spalart Philippe,et al.  Young-Person''s Guide to Detached-Eddy Simulation Grids , 2001 .

[16]  P. Spalart.  A One-Equation Turbulence Model for Aerodynamic Flows , 1992 .

[17]  Sanjay R. Mathur,et al.  A Reynolds-averaged Navier-Stokes solver using unstructured mesh-based finite-volume scheme , 1998 .

[18]  J. Murthy,et al.  A PRESSURE-BASED METHOD FOR UNSTRUCTURED MESHES , 1997 .

[19]  Robert J. Englar,et al.  Advanced Aerodynamic Devices to Improve the Performance, Economics, Handling and Safety of Heavy Vehicles , 2001 .

[20]  Steven X. S. Bauer,et al.  Simple and Low-Cost Aerodynamic Drag Reduction Devices for Tractor-Trailer Trucks , 2003 .

[21]  L. Davidson,et al.  Large Eddy Simulation of Flow Past a Square Cylinder: Comparison of Different Subgrid Scale Models , 2000 .

[22]  Philippe R. Spalart,et al.  Trends in turbulence treatments , 2000 .