• 3D incompressible wind flow analysis with OpenFOAM® software package
• Direct model import from RFEM or RSTAB including neighboring and terrain models (3DS, IFC, STEP files)
• Model design via STL or VTP files independent of RFEM or RSTAB
• Simple model changes using Drag and Drop and graphical adjustment assistanc

• Automatic corrections of the model topology with shrink wrap networks
• Option to add objects from the environment (buildings, terrain, ...
• Wind load determined over the height of the building, depending on standard-specific parameters (velocity, turbulence intensity)
• K-epsilon and K-omega turbulence models
• Automatic mesh generating adjusted to the selected depth of detail
• Parallel calculation with optimal utilization of the capacity of multicore computers
• Results in just minutes for low-resolution simulations (up to 1 million cells)
• Results within a few hours for simulations with medium/high resolution (1‑10 million cells)
• Graphical display of results on the Clipper/Slicer planes (scalar and vector fields)
• Graphical display of streamlines
• Streamline animation (optional video creation)
• Definition of point and line samples
• Display of aerodynamic pressure coefficients
• Graphical display of turbulence properties in the wind field
• Optional meshing using the boundary layer option for the area near the model surface
• Consideration of rough model surfaces possible
• Optional use of a seond-order numerical scheme
• Multilingual user interface (e.g. German, English, Spanish, French)
• Documentation possible in the RFEM and RSTAB printout report

2. Input

RFEM and RSTAB have a special interface for exporting models (i.e. structures defined by members and surfaces) to RWIND Simulation. In this interface, the wind directions to be analyzed are defined by means of related angular positions about the vertical model axis, and the height-dependent wind and turbulence intensity profile is defined on the basis of a wind standard. Based on these specifications, you can create your own load cases for each angle setting by using fluid parameters, turbulence model properties, and iteration parameters that are all saved globally. These load cases can be extended from STL vector graphics by partial editing in the RWIND Simulation environment using terrain or environment models.

You can also run the program RWIND Simulation manually without the interface in RFEM and RSTAB. In this case, the structures and terrain environment in RWIND Simulation are directly modeled by importing STL and VTP files. The height-dependent wind load and other fluid-mechanical data can be defined directly in RWIND Simulation.

3. Calculation

RWIND Simulation uses a numerical CFD model (Computational Fluid Dynamics) to perform wind flows around objects using a digital wind tunnel. Specific wind loads are generated from the simulation process for RFEM or RSTAB.

A 3D solid mesh is used for the simulation. RWIND Simulation carries out an automatic meshing where it is possible to set the entire mesh density as well as the local mesh refinement on the model very easily using a few parameters. A numerical solver for incompressible turbulent flows is used to calculate the wind flows and the surface pressures on the model. The results are then extrapolated on the model. RWIND Simulation has been designed to work with different numerical solvers.

We currently recommend using the OpenFOAM® software package, which has provided very good results in our tests and is also a frequently used tool for CFD simulations. Alternative numerical solvers are under development.