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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Could you use some fresh air for your project? Take a look at RWIND 2. With a digital wind tunnel, the program allows for a numerical simulation of wind currents around any building geometry. What does that bring you? RWIND determines the wind loads on the surfaces of your model. It helps you enormously, especially with high or complex structures, and is available in the version Basic and Pro.

It was developed in collaboration with

PC Progress andCFD Support You can use the program as a stand-alone application or together with RFEM and RSTAB for a complete structural analysis and design.

In RWIND 2, 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



Rely on Dlubal's programs even in windy matters. A special interface application is available in RFEM and RSTAB for modeling the bodies in RWIND 2 . There, the wind directions to be analyzed for your project are defined using related angular positions around the vertical model axis. In addition, the height-dependent wind and turbulence intensity profile is determined on the basis of a wind standard. This information results in separate load cases depending on the angular position. Fluid parameters, turbulence model properties and iteration parameters, all of which are stored globally, are used to help. You can extend these load cases by partial editing in the RWIND 2 environment with terrain or environment models from STL vector graphics.
Alternatively, you can easily operate RWIND 2 manually and without the interface application in RFEM or RSTAB. In this case, the bodies and the terrain are modeled directly in the program from imported STL and VTP files. You can define the height-dependent wind load and other flow mechanical data in RWIND 2 directly.
Due to its versatility, RWIND 2 is always at your side for your individual projects.



Work on your models with efficient and precise calculations in the digital wind tunnel. RWIND 2 uses a numerical CFD (Computational Fluid Dynamics) model to simulate wind flows around objects. Specific wind loads are generated from the simulation process for RFEM or RSTAB.

RWIND 2 performs this simulation using a 3D solid mesh. The program ensures automatic meshing, whereby you can easily set the total mesh density and the local mesh refinement on the model with just 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 your model. RWIND 2 is designed to work with various numerical solvers.

We currently recommend that you use the OpenFOAM® software package, which delivers very good results in our tests and is also a widely used tool for CFD simulations. Alternative numerical solvers are under development.



Always keep an eye on your results. In addition to the resulting load cases in RFEM or RSTAB (see next section), the results from the aerodynamics analysis in RWIND 2 represent 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 and graphically evaluated in the RWIND 2 environment. The flow results around the body geometry in the overall display are rather confusing, but the program has a solution for this. In order to present you clear results, freely movable section planes are displayed here for the separate display of the "volume results" in one plane. Accordingly, in the case of the 3D branched streamline result, the program presents you with a static display as well as an animated display in the form of moving lines or particles. This option helps to represent the wind flow as a dynamic effect.
You can export all of the results as an image or, specifically for the animated results, as a video.


Transfer of Wind Loads to RFEM or RSTAB

Let your model be analyzed and calculated precisely and quickly across programs. As soon as you start the analysis in the interface programs, a batch processing process starts. This puts all member, surface and volume definitions of the RFEM or RSTAB model rotated and with all relevant coefficients in the numerical wind tunnel of RWIND 2 . There, the model is analyzed and the resulting surface pressures are returned to the respective load cases in RFEM or RSTAB as FE network node loads or member loads.
You can calculate these load cases with RWIND loads and simply merge them with other loads in load combinations and result combinations.


This offer is neither approved nor endorsed by OpenCFD Limited, producer and distributor of the OpenFOAM software via and the owner of the OPENFOAM® and OpenCFD® trademarks.


Contact Dlubal

Do you have any questions about our products or which are best suited for your design projects? Contact us via phone, email, chat or forum or search the FAQ page, available 24/7.

+420 227 203 320

[email protected]

Dlubal is Member of WtG

WtG eV

Dlubal Software is a member of the Windtechnological Society

Further Information