FAQ 004197 EN

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Which turbulence setting should be used for the numerical wind load generation on buildings?


The RWIND Simulation program offers an optional height-variable consideration of the k-ε or k-ω turbulence model for the numerical flow simulation. The necessary turbulence parameters can be specified manually or determined automatically from a user-defined turbulence intensity value. In the standard, a turbulence intensity of 1% is specified constantly over the wind tunnel height. This value is based on the recommendation by the CFD Support company, which has many years of experience in the field of numerical flow simulation.

Figure 01 - Effect of Turbulence Intensity

In RWIND Simulation, the turbulence model is organized in the "Parameters of Simulation" menu under the "Turbulence" tab.

The interface menu in RFEM or RSTAB organizes the turbulence model for the automated calculation of wind loads in the background in the "Simulate and Generate Wind Loads" menu under the "Wind Load" tab. In this case, the "Use uniform turbulence at inlet" function in the Turbulence Properties field creates a constant turbulence specification across the height of the wind tunnel. By deactivating this function, it is possible to specify a turbulence variable over the height. In addition to the location-specific specification of the wind velocity profile, the wind description according to the standard also automatically determines the turbulence property depending on the terrain accuracy over the height. Alternatively, you can define the turbulence property manually using the "User-defined turbulence" function in the form of table entries.


Turbulence Wind vortex CFD Height-dependent



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  • Updated 5 April 2021

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RWIND Simulation

Stand-Alone Program

Stand-alone program for numerical simulations of wind flow around buildings or any other objects. The generated wind loads acting on these objects can be imported into RFEM / RSTAB programs for static and dynamic analysis.

Price of First License
2,690.00 USD