Aerodynamic analysis of a Semi-Truck Trailer vehicle
The project simulates external aerodynamics of a Semi-truck trailer vehicle via steady state turbulent flow analysis with the K-Omega SST model for turbulence modeling.
The source geometry inculdes a Semi-truck model with trailer and was provided by GrabCAD user Joerg Schmit . The geometry was simplified for external flow analysis and is shown in the figure below . The vehicle has dimensions of about, lenght 16.6 m, width 3 m and height 4 m .
The domain is 18 m upstream, 35 m downstream and 15 m in positive X and Y directions.
To reduce the computational domain symmetry condition was taken along the flow direction. The domain was meshed using the ‘Snappy-Hex-Mesh’ on the SimScale platform. The resulting mesh consists of approximately 6 million cells and is shown in the figure below.
An inlet velocity of 28 m/s was taken with a pressure boundary condition at the outlet. The jobs were run on 16 compute cores and took around 4.6 hours. The simulation analysis the mean flow field around the vehicle. The results below (processed on ParaView) provide insight as to how the flow behaves around the vehicle body. The figures show high pressure distribution on the front face and a large flow recirculation region behind the trailer.
Shown below are the velocity contours.
Shown below are the velocity streamlines.
Shown below is the pressure distribution on the body