RWIND Simulation | Wind Simulation (Wind Tunnel)

Product Description

Generation of Wind Loads Based on CFD for Any Type of Structure

Great Program RWIND Simulation

"RWIND Simulation - absolutely brilliant!!! CONGRATULATIONS!!!"

Very Successful RWIND Simulation Webinar

"The webinar about RWIND Simulation was very successful!

From now on, it is possible to analyze wind forces on geometries of objects that are not regulated in the standard. The wind force assumption according to the standard was often a more or less good estimate."

A Perfect Combination

"The RFEM add-on module RF-STABILITY is a perfect combination with RWIND Simulation. Using RF-STABILITY, I can perform a buckling analysis to get accurate effective lengths. Using RWIND Simulation, I can get accurate wind loads. For unusually shaped structures, it would be a wild guess if calculating wind loads from the standard code... either not conservative or too conservative. My client is happy with the results and impressed!"


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RWIND Simulation is a stand-alone program for numerical simulations of wind flow (digital wind tunnel) around buildings or any other objects and generating wind loads; that is, forces acting on these objects.

This program was developed in cooperation with PC-Progress and CFD Support and can be used as a stand-alone application or together with RFEM and RSTAB for complete structural analysis and design.

Wind profiles and turbulence intensity diagrams can be generated according to the following standards:

  • European Union EN 1991-1-4 (with National Annexes)
  • United States ASCE/SEI 7-10
  • United States ASCE/SEI 7-16
  • Canada NBC 2015



  • 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 assistance
  • 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 (for example, German, English, Spanish, French)
  • Documentation possible in the RFEM and RSTAB printout report


RFEM and RSTAB have a special interface for exporting models (that is, 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.



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 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.



In addition to these resulting load cases in RFEM and RSTAB, more results of the aerodynamics analysis in RWIND Simulation are obtained which display the flow problem as a whole:

  • Pressure on structure surface
  • Pressure field about structure geometry
  • Velocity field about structure geometry
  • Velocity vectors about structure geometry
  • Flow lines about structure geometry
  • Forces on member-shaped structures that were originally generated from member elements
  • Convergence diagram
  • Direction and size of the flow resistance of the defined structures

These results are displayed in the RWIND Simulation environment and evaluated graphically. Since the flow results around the structure geometry are confusing in the overall display, freely movable section planes for separate display of the "solid results" in a plane are output for analysis purposes. Accordingly, in the 3D branched streamline result, an animated display in the form of moving lines or particles is shown in addition to a structural representation. This option helps to represent the wind flow as a dynamic effect.

All results can be exported as a picture or, especially for animated results, as a video.


Transfer of Wind Loads to RFEM or RSTAB

When you start the analysis in the interface program, a batch process starts that puts all member, surface, and solid definitions of the RFEM/RSTAB model rotated with all relevant coefficients into the numerical wind tunnel of RWIND Simulation, analyzes the model, and returns the resulting surface pressures as FE mesh nodal loads or member loads to the respective load cases in RFEM and RSTAB.

These load cases containing RWIND Simulation loads can be calculated and combined with other loads in load combinations and result combinations.


This offering is not approved or endorsed by OpenCFD Limited, producer and distributor of the OpenFOAM software via, and owner of the OPENFOAM® and OpenCFD® trade marks.

Dlubal is Member of WtG

WtG eV

Dlubal Software is a member of the Windtechnological Society

Further Information