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  • Answer

    For the calculation, the program creates a solid mesh between the model and the outer sides of the wind tunnel. In this case, the solid mesh does not connect directly to the model geometry, but to a separate model wrapping mesh placed around the model geometry. This model wrapping mesh has a certain distance to the exact model geometry, depending on the model mesh setting (Simplified Model - Shrink-Wrapping-Mesh). Similar to the surrounding model wrapping mesh, the exact model geometry itself is also represented from a wrapping mesh, but on the exact model shape.

    Figure 01 - Mesh Types

    With the OpenFOAM calculation, a print result is obtained on each solid element. These values are extrapolated to the respective edge nodes at the transition to the model. To determine the final surface pressures on the model geometry, the pressures at the edge nodes of the solid mesh are transformed into the exact model mesh wrapping in a further step. In the event that the triangular meshing of the exact model mesh geometry is too rough, the last transformation process initiates a partial refinement of the exact model mesh wrapping.

    Figure 02 - Difference Between Wrapping Mesh Geometry and Exact Model Geometry

  • Answer

    The RWIND Simulation is a program for numerical flow simulation . It is a tool for describing a wind flow problem around an object consisting of a system of partial differential equations with the output of an approximate solution on the basis of the finite-volume method. Such a mathematical model provides similar to a simplified model in a real wind tunnel information about the wind velocity field and the pressures acting on the surfaces of the wind flow object.

    The standards describing wind effects on buildings and structural components (e.g. EN 1991-1-4, ASCE/SEI 7, etc.) are based on different principles. The rules and measures specify corresponding instructions for determining the wind loads for specific situations and applications. These formulas are undoubtedly correct for the assigned situations and the resulting values have been confirmed in practice.

    However, these guidelines do not describe all situations that occur in the real world of engineers. Here, infinitely different model shapes in the wind flow are processed, whereby each shape has its own high-grade influence on the resulting surface pressures caused by the wind load. However, for all model shapes not mentioned in the respective directives, the equivalent load from wind effects remains unclear.

    RWIND Simulation can help here in its role as an auxiliary tool for determining the resulting forces from the wind action. However, despite the use of RWIND Simulation, all requirements of the valid standardization must be ensured. The technology used in the simulation program may also provide further useful insights for sufficiently controlled object shapes.

    Figure 01 - Wind Flow Around Complex Antenna System
    Figure 02 - Surface Pressures on Complex Antenna Installation due to Wind Load

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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.

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.

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