Customer using AutoDesk Inventor 11 to create F1 Model and having trouble with the STL files coming into Virtual Wind Tunnel v. III either sideways or backwards.

Bioracer Aero Create your own virtual wind tunnel by placing our Bioracer Aero webcam in front of your training rollers. Whilst training, you will receive live feedback on your aerodynamic posture. You can track your optimal aerodynamic position and train it. Flow Design is virtual wind tunnel software for product designers, engineers, and architects. It models airflow around design concepts to help test ideas early in the development cycle. This product will no longer be available for Education in 2020.

Solution per CHAM (vendor for Virtual Wind Tunnel):
The F1 VWT was originally set up to accept CAD data from ProDesktop, and we used the default alignment from that product. Of course, STL files can be created and exported by a variety of products, and in any alignment, which is why customers may have encountered their particular problem.
We recommend users to ensure that all STL files get generated and exported from their preferred CAD package using an alignment that the F1 VWT wants to receive!

Virtual Wind Tunnel

If the STL file does get imported sideways or backwards, the user can simply click on the object and rotate it into the correct position using the two middle arrow buttons at the top of the handset.
CHAM expects a solution for this problem in a future VWT software update.

HomeVirtual Wind Tunnel

Virtual Wind Tunnel

HyperWorks Virtual Wind Tunnel is a vertical solution for external aerodynamics. The streamlined workflow in combination with customizable automatic result reporting ensures quick turnaround times during the development cycle.

Altair’s HyperWorks Virtual Wind Tunnel is a vertical application tailored for external aerodynamic studies. Designed with the users’ needs in mind, the graphical user interface provides easy access to problem definition and solution strategies. The automated and customizable report generation after each simulation run provides a consistent method for design evaluation. HyperWorks Virtual Wind Tunnel integrates smoothly with other Altair products.

Benefits

Accurate, Robust and Scalable CFD Solver

HyperWorks VWT is powered by Altair’s computational fluid dynamics solver, AcuSolve®, a general-purpose, finite element based flow solver providing fast turnaround times, accuracy and robustness.

Architected for parallel execution on shared and distributed-memory computer systems, using a hybrid parallelization technique, AcuSolve provides fast and efficient transient and steady-state solutions for unstructured grids, and it is capable of scaling over a large number of computing cores.

HyperWorks VWT utilizes Reynolds-Averaged Navier-Stokes (RANS) and Detached-Eddy Simulation (DES) technology to model turbulent flows and to predict the flow field. DES technology combines fine-tuned, statistical RANS technology for modeling near walls and attached boundary layers with the ability of large-eddy simulation (LES) to model the separated regions in the wake behind the vehicle. Accurate external aerodynamics results are achieved for both, steady-state simulation using the RANS approach when physics allows and transient simulation using the DES approach.

Virtual Wind Tunnel Online

AcuSolve’s fluid structure interaction (FSI) capabilities are included in VWT to support studies of flexible components in an external flow field.

Rotating parts, e.g. wheels, are modelled by prescribing a tangential wall velocity to include rotational effects into the simulation. For automotive use cases, heat-exchangers or condensers are modelled with a porous material model to consider the pressure drop through the components. The fluid material used during the simulation is defined via density and viscosity, and can be adapted to model for example water or air at a specific temperature.

Advanced Meshing

HyperWorks VWT comes with a fast and efficient unstructured volume mesher including boundary layer generation. User defined volume mesh refinement zones are used to create a locally refined volume mesh to capture important flow phenomena, e.g. the wake of a vehicle or a building. Parameters for boundary layer meshing can be defined globally or on a part basis to have maximum control of the total element count and use refined layers only in regions where it is necessary. Volume meshing for an external automotive aerodynamics analysis (including underbody, underhood compartment and boundary layers) is typically done in a few hours.

Highly Automated and Streamlined Workflow Process

VWT comes with a friendly and intuitive user environment. It is an all-in-one environment where users can import the surface mesh (water tight mesh), set up the problem, submit the simulation and obtain a final report.

The setup process is highly automated, with a minimum number of parameters, and without compromising the solution quality. Additional controls over the various parameters are provided in the user environment.

The simulation can be easily submitted to high-performance computing systems to expedite memory and compute-intensive tasks such as volume meshing, solving and post-processing.

A report containing problem setup, mesh statistics and results is generated automatically after completion of the simulation. In addition, advanced CFD post-processing may be performed for the most complex and large CFD data visualization, interactively or via batch processing mode.

Improving aerodynamic performance on a bicycle (Courtesy of Specialized)

Simulation of aerodynamics of an architectural tower

Complex boundary layer mesh around a motorcycle tire

Capabilities

Pre-processing

• Meshing
  • Predefined mesh settings available, coarse/medium/fine
  • User defined volume refinement zones, also for individual parts
  • User defined Boundary Layer (BL) parameters, globally or on part basis.
  • Exclude parts from BL growth to reduce total element count
  • Advanced BL meshing algorithms to deal with complex geometry
• Analysis setup
  • Definition of rotating wheels or radiators with a few mouse clicks
  • Option for moving wind tunnel ground
  • Automatic computation of vehicle’s frontal reference area

Solver

• Based on Altair’s CFD solver AcuSolve
• Low requirement on element quality
• High scalability even for low mesh-node/compute-node ratio
• Robust Fluid-Structure-Interaction (FSI) capabilities
• Transient & steady state simulation
• RANS and DES turbulence modeling

Post-Processing

• Automatic report generation containing
• Summary of case setup
• Mesh statistics
• Numerical results, e.g. drag coefficient or y+ plots
• User defined sections with contour plots
• User defined probe points to monitor the evolution of the flow field in a particular location