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CFD calculations are in general very complex. An accurate calculation of wind flow around complicated structures is very demanding on time and computational costs. In many civil engineering applications, high accuracy is not needed and our CFD program RWIND 2 enables in such cases to simplify the model of a structure and reduce the costs significantly. In this article, some questions about the simplification are answered.
Occasionally, the question arises how to determine the correct load application point of the positive transverse loads in RF-/STEEL EC3 and RF-/STEEL AISC.
When modeling with finite elements, sooner or later you come up with the question of how two surfaces (2D elements) lying on top of each other can be modeled. Hence, both surfaces are often modeled in the same plane. The possible consequences of this approach, and whether there are better solutions, are described below.
From time to time, two intersecting beams overlap at a short distance. Such a structure raises the question, with regard to the modeling, of how it is possible to consider a contact with force transmission under compression between the two beams, while the contact under tension (for example, in case of a lifting top beam) should fail.
When modeling surface models, such as a frame joint or similar structures, there is always the question of how to model a prestressed bolt connection. In this case, it is always necessary to find a compromise between the practicable and detailed solution. The following article describes the modeling procedure of such a connection, based on the joint diagram calculation method.
As requested by many customers, the nodes are now represented by cubes after export using the direct interface to AutoCAD or in a DXF file. If you want to reuse the AutoCAD data in RFEM or RSTAB, make sure not to import all the layers when specifying the settings for the import.
A network dongle is the appropriate solution to ensure security for licensing within companies working with several RFEM and/or RSTAB licenses. First, the dongle is placed on a central server. The licenses are then requested by RFEM and RSTAB, as well as all other stand-alone programs, from this dongle via the network.