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Why Dlubal Software?


  • More than 45,000 users in 95 countries
  • One software package for all application areas
  • Free support provided by experienced engineers
  • Short learning time and intuitive handling
  • Excellent price/performance ratio
  • Flexible modular concept, extensible according to your needs
  • Scalable license system with single and network licenses
  • Proven software used in many well-known projects


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Wind Simulation & Wind Load Generation

With the stand-alone program RWIND Simulation, wind flows around simple or complex structures can be simulated by means of a digital wind tunnel.

The generated wind loads acting on these objects can be imported to RFEM or RSTAB.

  • RF-/STEEL Cold-Formed Sections | Features




    • Available for cold-formed L, Z, C, channel, top-hat, and CL sections from the cross-section database, as well as for cold-formed (non-perforated) SHAPE-THIN 9 cross-sections
    • Determination of the effective cross-section considering the local buckling and the distortional buckling
    • Cross-section ultimate limit state, stability, and serviceability limit state designs according to EN 1993‑1‑3
    • Design of local transverse forces for webs without stiffening
    • Available for all National Annexes included in RF-/STEEL EC3
    • RF-/STEEL Warping Torsion module extension (license required) for stability analysis according to the second-order analysis as stress analysis including consideration of the 7th degree of freedom (warping)
  • Activating Designs for Cold-Formed Sections in RF-/STEEL EC3

    RF-/STEEL Cold-Formed Sections | Input




    Since RF-/STEEL Cold-Formed Sections is fully integrated in RF-/STEEL EC3, the data is entered in the same way as for the usual design in this module. It is only necessary to select the design option for cold-formed cross-sections in the Details dialog box.

  • Design Results for a Cold-Formed Top-Hat Section in RF-/STEEL EC3

    RF-/STEEL Cold-Formed Sections | Results




    The design results are displayed in RF-/STEEL EC3 in the usual way.

    Among other results, the corresponding result windows include the effective cross-section properties due to axial force N, bending moment My, bending moment Mz, internal forces, and design summary.

  • Graphical output of response

    CADS Footfall Analysis

    There is a known complexity of calculating footfall response on irregular floors or staircases of any type.
  • Analysis input

    CADS Footfall Analysis

    Footfall Analysis links with RFEM, using its model geometry, so that the user is not required to create a second model specifically for footfall analysis
  • Eigenmode mass participation graph

    CADS Footfall Analysis

    • Overall maximum response factors and critical nodes
    • Resonant analysis (maximum response factor, RMS acceleration, critical node, critical frequency)
    • Impulsive (transient) analysis (maximum response factor, peak acceleration/velocity, RMS acceleration/velocity, critical node, critical frequency)
    • Vibration dose values for both resonant andimpulsive analyses

    • Response factor vs walking frequency
    • Mass participation vs eigenmodes
    • Velocity time history
  • Display of Load Distribution in RFEM

    RWIND Simulation | 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 factors in the numerical RWIND Simulation wind tunnel, analyzes the model, and returns the resulting surface pressures as FE node 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.

  • RWIND Simulation | Features



    • 3D incompressible wind flow analysis with OpenFOAM® software package
    • Direct model import of RFEM or RSTAB or STL files
    • 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, ...)
    • Height-dependent velocity profiles according to the standard
    • 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)
  • General Data for Generating RFEM/RSTAB Load Cases

    RWIND Simulation | 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 elevation-dependent wind 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 elevation-dependent wind profile and other fluid mechanical data can be directly defined in RWIND Simulation.

  • Considering Terrain Models in RWIND Simulation | ©

    RWIND Simulation | 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.

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First Steps

First steps

We provide hints and tips to help you get started with the main programs RFEM and RSTAB.

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Knowledge Base

In addition to our technical support (e.g. via chat), you’ll find resources on our website that may help you with your design using Dlubal Software.