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RWIND 3 Wind Simulation
  • CFD simulations
  • Wind tunnel

RWIND 3 Wind Simulation

RWIND 3 provides you with a powerful digital wind tunnel based on numerical CFD simulation that calculates realistic wind flows precisely, making standard-compliant wind load generators unnecessary. The software reliably and quickly simulates wind flows around any building and structural geometry and automatically determines the resulting wind loads on all surfaces.

Thanks to seamless integration with the structural analysis software RFEM and RSTAB, you benefit from particularly efficient and convenient workflows. RWIND 3 is flexible in use and available in Basic and Pro versions, optimally tailored to your individual requirements.

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Model of the FC Campus Office | Use of the digital wind tunnel for numerical simulation in Karlsruhe © Kunstlin Ingenieure
RWIND 3 Icon without borders

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

RWIND 3 is used to determine wind loads for buildings. In addition to a 3D model, all you need is a wind load description. The program automatically determines all other parameters for the flow simulation, so the analysis is performed at the push of a button.

RWIND 3 is a stand-alone program, but can also interact with the structural analysis programs RFEM and RSTAB.

The usual workflow includes creating a model in RFEM or RSTAB and then performing the wind analysis in RWIND using a digital wind tunnel. In this case, RWIND can optionally run in the background. The wind loads determined in RWIND are then applied to RFEM and RSTAB.

RWIND is suitable not only for buildings in structural engineering, but for all (including complex) structures.

  • Hardware and System Requirements
Simulation of wind flow around the structure of a solar panel in the RWIND program
Video: Calculation of Wind Loads with CFD Simulation
The model shows a container structure that simulates numerical wind flows in the digital wind tunnel RWIND.
Container Structure in Digital Wind Tunnel in RWIND | © Modular Structural Consultants LLC
Eiffel Tower model under numerical wind flow simulation in the digitized wind tunnel
Calculation of Wind Loads with CFD Simulation
3D model of Old Trafford Stadium with color-coded wind flow, analyzed in RWIND software
Calculation of Wind Loads with CFD Simulation
Simulation of wind flow around the structure of a solar panel in the RWIND program Video: Calculation of Wind Loads with CFD Simulation
The model shows a container structure that simulates numerical wind flows in the digital wind tunnel RWIND. Container Structure in Digital Wind Tunnel in RWIND | © Modular Structural Consultants LLC
Eiffel Tower model under numerical wind flow simulation in the digitized wind tunnel Calculation of Wind Loads with CFD Simulation
3D model of Old Trafford Stadium with color-coded wind flow, analyzed in RWIND software Calculation of Wind Loads with CFD Simulation
Video: Calculation of Wind Loads with CFD Simulation

Main Features of RWIND 3

Features of RWIND Basic Features of RWIND Pro Input Calculation Output All Features
The image shows a hexagonal grid-shell structure as a shading roof in a RWIND simulation.

Advantages of RWIND 3

  • Realistic wind loads using CFD – standard-based wind load generators are no longer necessary
  • Seamless integration into the structural analysis software RFEM and RSTAB for efficient workflows
  • Wind load application on curved membrane roofs and other complex geometries not covered by wind load standards
  • Consideration of the influence of neighboring buildings
  • Wind analysis tool for structure modifications during the preliminary design process
  • Online licensing as part of the Dlubal Software Extranet
  • Ability to close structural openings for wind simulation, such as windows or doors
  • Wind load application, a calculation of anchorages for photovoltaic systems
  • Consideration of internal pressure due to wind flow through structural openings

Application Examples of RWIND 3

Silo model in RWIND displaying streamlines illustrating the movement direction of an intangible fluid element
  • 3D Viewer
  • 3D Viewer | Babylon
  • Virtual Reality

Streamlines

Here you can see the model of a silo with a display of streamlines. The streamlines indicate the direction in which the immaterial fluid element will be moving at a given point of time.

Your browser does not support the video tag.
  • 3D Viewer
  • 3D Viewer | Babylon
  • Virtual Reality

Velocity Field

Here you can find the animation of the wind velocity field on a high-rise building. The velocity field represents a section through the wind tunnel and shows the distribution of the wind velocity.

The timber gridshell displays wind-induced pressure distribution using a color map.
  • 3D Viewer
  • 3D Viewer | Babylon
  • Virtual Reality

Surface Quantities

Here you can see a timber lattice structure with the pressure display on surfaces. By default, the pressure caused by the wind on surfaces is displayed as a "color map": A pressure value is assigned to each point on the surface.

This image shows a 3D model of Al-Janoub Stadium with wind velocity isolines on a horizontal plane.
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  • 3D Viewer | Babylon
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Isolines

A model of the Al Janoub Stadium with the displayed isolines of the wind velocity field in the horizontal plane.

The image shows a simulation of a transient, incompressible and turbulent wind flow, calculated with RWIND 2.
Graphical Workspace

The graphical workspace takes up the main part of the user interface. There you can create the model, apply loads, as well as examine the results. By clicking or rotating the cube (hold down the left mouse key while moving the pointer), you can control the view. As an alternative, you can use the mouse functions to set the view.

Navigator

The navigator manages the file data in a tree structure. At the bottom edge, there are three tabs (four after the calculation). Use them to switch between the tabs that control the Data, Display, Views, and Results.

Edit Bar – Simulation

The Edit Bar – Simulation guides you through the simulation settings, including the basic control of the individual simulation results. In the window, you can find a result box, a reference to further model changes and the components for editing the results.

Simulation Parameters

The Simulation Parameters dialog boxes guide you through the settings of the wind simulation, for example: Setting of the transient flow behavior or the wind profile.

Intuitive User Interface

As in RFEM and RSTAB, the user interface of RWIND is based on the CAD concept. A navigator with an editing window ensures easy navigation and control of the simulations. In the navigator, you can find the functions required for controlling the model display, including the result display. The editing window allows you to control the simulation results, define their properties and run the individual simulations, such as the flow animation, or the display of pressure or wind velocity fields.

Moreover, RWIND provides you with an intuitive user interface, allowing you to easy control and customize your simulations. Dlubal Software is constantly working on updates and improvements of the existing features. The useful features of RWIND include:

  • Displaying RWIND Results Directly in RFEM 6
  • CFD Calculation
  • Transfer of Wind Loads to RFEM or RSTAB
More Features
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.

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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Displaying RWIND Results Directly in RFEM 6

The RWIND results can be displayed directly in the main program. In the Navigator – Results, select the "Wind Simulation Analysis" result type from the list above. Currently, the following results are available, which refer to the RWIND computational mesh: surface pressure, the cp coefficient of a surface, and the wall distance y+ (stationary flow).

More Info
The display of the RWIND results in RFEM 6 shows detailed wind load analysis.

Important Principles in Wind Simulation

RFEM and RWIND are used to generate a tensile membrane structure model so that wind simulation can be started, along with the implementation of important criteria. RWIND is a powerful tool for creating wind loads on general structures and complicated forms.

CFD solver is an OpenFOAM® software package (version 17.10), which gives very good results and is a widely used tool for CFD simulations.

More Information
  • Verification Example
  • Wind Tunnel Size
  • Computational Grid Study
  • Enhanced Wall Function

Editor for Mesh Refinement Control

The mesh refinement editor allows for graphical visualization and manual control of the mesh refinements, facilitating your definition of precise rules for unusual model dimensions. Furthermore, it optimizes the definition of small model details on large buildings or in detailed mesh sections. This editor significantly improves your workflows.

More Info
The image displays the Baháʼí Temple of South America and a mesh refinement editor interface.

Getting Started with RWIND 3

You have not yet worked with RSECTION, or not often? Then you will find helpful hints and tips here to help you get started with the Dlubal programs.

More Info
The image shows the introduction to wind simulation with RWIND. The image shows the introduction to wind simulation with RWIND.

Structural Analysis Models to Download

If you are looking for models to practice on or as inspiration for your projects, you've come to the right place. We provide you with a vast number of structural analysis models to download, such as RFEM, RSTAB, RSECTION, or RWIND files.

All Models
Downloadable technical model templates for precise engineering analysis. Downloadable technical model templates for precise engineering analysis.

Interaction Between RFEM 6 / RSTAB 9 and RWIND 3

The structural analysis programs RFEM 6 / RSTAB 9 interact seamlessly with RWIND 3. The smooth data exchange between the programs allows you to efficiently generate wind loads for your models, whether simple or complex.

The building model in RFEM 6 shows the deformation under wind load, calculated with the CFD wind simulation program RWIND.
Arrows

RFEM 6 / RSTAB 9

To model the bodies in RWIND Basic, you will find a special application in RSTAB. In this application, you define the wind directions to be analyzed using related angular positions around the vertical model axis.

The numerical CFD model simulates wind flow around buildings and determines wind loads.

RWIND 3

RWIND uses a numerical CFD (Computational Fluid Dynamics) model to simulate wind flows around your objects using a digital wind tunnel.

Your browser does not support the video tag.

Applying Wind Loads from Experimentally Determined Pressure Values

If you have experimentally determined surface pressures available for a model, you can apply them to a structural model in RFEM 6. Then, they are processed by RWIND 3 and used as wind loads for the structural analysis in RFEM 6.

This process allows for a realistic simulation of wind loads on a structure, contributing to a precise analysis and design of the structure.

More Info
The image demonstrates how experimentally determined surface pressures are applied to a structural model for wind load simulation in RFEM.

Freely Adjustable Wind Permeability for Surfaces

RWIND 3 Pro allows you to easily apply permeability to surfaces by defining the Darcy coefficient D, the inertial coefficient I, and the length of the porous medium in the flow direction L. Thus, you can define pressure boundary conditions for porous zones. And what are the advantages of permeability?

More Information
  • More efficient modeling
  • Determination of microclimate
  • Influence analysis
  • Improved precision

Models for Transient Turbulence: URANS or DDES?

In structural engineering, predicting the effects of turbulent wind flows on structures is crucial for strength and safety. Turbulence modeling in computational fluid dynamics (CFD) helps to simulate these interactions. Engineers need to select a practical turbulence model by considering efficiency, accuracy, and applicability.

More Info
DDES Turbulence Model in RWIND Simulation Visualization Software

Kármán Vortex Street in RWIND

This article describes the modeling of a Kármán vortex street in RWIND. The program analyzes the vortex effects behind narrow, high objects in urban areas on the surrounding buildings. The results show that vortices occur at certain Reynolds numbers, and it is necessary to adjust the inlet velocity in order to achieve the desired behavior. The mesh density in the wind tunnel has a significant impact on the modeling, and further optimization could be achieved by a finer mesh.

More Info
The simulation model examines vortex shedding effects behind narrow, high objects in urban areas on the surrounding buildings.

Complying with Code Requirements by Using CFD in Wind Load Calculations

Compliance with building codes, such as ASCE 7, NBC, Eurocode and more, is essential to ensure the safety and sustainability of buildings. Computational Fluid Dynamics (CFD) plays a vital role in this process by simulating fluid behavior, helping architects and engineers meet code requirements related to wind load analysis, natural ventilation, fire safety, and energy efficiency.

More Info
The image explains how computational fluid dynamics is applied to meet wind load calculation requirements under Eurocode and other building codes.

Compare RWIND 3 Basic vs. Pro!

RWIND 3 is available in two versions – Basic and Pro – to suit different project needs. Explore each version’s unique features to find the best fit for your wind simulation requirements.

RWIND 3 Basic
RWIND 3 Pro
Steady Flow Calculation
Transient Flow Calculation
Steady Flow Turbulence Model: RAS k-ε, k-ω
Transient Flow Turbulence Model: Spalart-Allmaras DDES
Trajectories of Flowing Particles in Transient Flow
Permeability, Permeable Surfaces

Use RWIND 2 Pro to easily apply a permeability to a surface. All you need is the definition of the Darcy coefficient D, the inertial coefficient I, and the length of the porous medium in the direction of flow L,to define a pressure boundary condition between the front and back of a porous zone. Due to this setting, you obtain the flow through this zone with a two-part result display on both sides of the zone area.

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