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APUS-VWT for Motorsports and External Aerodynamics
Set up your 'Virtual Wind Tunnel' and get results in less than 3 hours
APUS-VWT (Virtual Wind Tunnel) is a new generation software, specifically suited for external aerodynamics. APUS-VWT enables engineers to carry out aerodynamic simulations and provide them with performance parameters for different designs, before physical testing is considered. Traditionally, validation of specific designs was performed in wind tunnels on scale models. Many times this is not possible either due to cost or time constraints. APUS-VWT embodies a new and especially robust solver which ensures the attainment of accurate solutions even on grids that the most well known CFD codes fail. Additionally APUS-VWT provides a fully automatic mesh generator, that produces hexa-dominant meshes from STL files that describe geometries of any complexity; from a rear wing to a full car. To take full advantage of APUS-VWT, you can either use the software in-house or you may decide to outsource the simulation to Symban's experts. Validation
APUS-VWT has been tested extensively, by comparing its predictions with experimental data. Some results are presented here. 1. Two element rear wing (Courtesy of Simon McBeath and the Wing Shop)This problem was set up and run in less than 2 hours for 1 million cells. The picture below shows the pressure distribution around a two-element rear wing for a hill climb/sprint car. Half-scale wind-tunnel data were available for comparisons.  The table shows the Lift and Drag values obtained with APUS-VWT and how they compare against experiments.
2. Comparisons with MIRA wind-tunnel figures for a Formula-Vee car
 Validation studies have been performed to compare experimental results with calculations for different wind speeds. The results showed that APUS-VWT is as reliable as a tool as the current state of science allows.
3. Speed-up your calculations by using the parallel version of APUS-VWT You can reduce you computing time dramatically, by running APUS-VWT on multi-processor systems. The calculation time can be reduced by partitioning your problem into smaller-sized problems and run on parallel computers or LINUX/Windows clusters. The image below shows partitions of the original data prior to running the problem on a parallel machine.  More Examples from the APUS-VWT software
Design improvement of a Le Mans Prototype racing car The flow around a Le Mans Prototype was investigated, by importing the CAD geometry (STL files) into APUS-CFD and setting up the simulation in APUS Virtual Wind Tunnel. The mesh was created automatically in a few minutes. The run was performed on a 2.4 GHz Pentium 4, Windows XP system, and the execution time for 1.1 Million cells was under 4 hours. The wind speed was set to 25 m/s. The images below show the racing car in the Virtual Wind Tunnel, the mesh generated for the solution and results obtained in the form of pressure contours and streamlines.
New mirror design reduces the Drag on a commercial lorry The flow around a Cab with a Roof deflector and a Trailer was simulated using two different types of mirrors. The standard mirrors (see image) produces more drag than the second design, which reduces the drag considerably. The image shows pressure contours on the surface of the vehicle.
Flow around an Indy racing car The flow around an Indy racing car was investigated, by importing the CAD geometry (STL files) into APUS-CFD and setting up the simulation in APUS Virtual Wind Tunnel. The mesh (1.7 Million cells) was generated automatically. The images below illustrate the mesh generated for the solution and results obtained in the form of pressure contours on the surface of the car.
Flow around a commercial Van The flow characteristics around a commercial Van were investigated. The mesh (868,000 cells) was generated automatically. The images below show pressure contours on the surface of the Van and Velocity contours at mid-plane.
Other Applications
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