The structural analysis software RFEM 6 is the basis of a modular software system. The main program RFEM 6 is used to define structures, materials, and loads of planar and spatial structural systems consisting of plates, walls, shells, and members. The program also allows you to create combined structures as well as to model solid and contact elements.
RSTAB 9 is a powerful analysis and design software for 3D beam, frame, or truss structure calculations, reflecting the current state of the art and helping structural engineers meet requirements in modern civil engineering.
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In RFEM and RSTAB, you can hide certain objects and thus create user-defined visibilities. These hidden objects are displayed in gray in the background. The intensity of the gray color can be adjusted in the "Program Options & Settings" dialog box under the "Settings" tab.You can select a value between 0 and 1. The higher the selected value, the darker the inactive objects are displayed.
If you display a visibility—as described in the manual chapter Visibilities—the inactive objects are also displayed with a reduced intensity.
To hide these inactive objects completely, deactivate the Show Hidden Objects in Background checkbox in the General category of the "Navigator – Display".
In the background, the profile of the turbulence intensity over the altitude is a pure factor function depending on the altitude. When multiplying the altitude-dependent factors by the entered turbulence intensity, the turbulence intensity profile applied at the wind tunnel entrance results.
The generic turbulence intensity profiles from the RFEM 5 or RSTAB 8 environment are each referenced to the bottom edge of the wind tunnel. Therefore, the factor function at this ground location has the value of 1, and thus defines the unmodified input value of the turbulence intensity at this location. At a higher position with a factor ≠ 1, the turbulence intensity input multiplied by this factor is applied accordingly.
The SST k-omega model is used for the k-ω turbulence model.
In RWIND Simulation, the turbulence model is organized in the "Parameters of Simulation" menu under the "Turbulence" tab.
The RFEM or RSTAB interface menu organizes the turbulence model for the automatic calculation of wind loads in the background in the "Simulate and Generate Wind Loads" dialog box under the "Wind Load" tab. In this case, the "Use uniform turbulence at the inlet" function in the Turbulence Properties section creates a constant turbulence specification over the height of the wind tunnel. By deactivating this function, you can specify the turbulence variable over the height. In addition to the location-specific parameter of the wind speed profile, the turbulence property dependent on the terrain roughness over the height is also defined automatically. As an alternative, you can define the turbulence property manually in the form of a table entry using the "User-Defined Turbulence" function.
You can control the intensity of the inactive objects in Program Options under the "Graphics" tab (see the image).