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  1. RWIND Simulation | Features

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    001393

    General

    • 3D incompressible wind flow analysis with OpenFoam solvers
    • Direct model import of RFEM/RSTAB or STL files
    • Simple model changes using drag and drop and graphical adjustment aids
    • Automatic corrections of the model topology with shrink wrap interconnections
    • Option to add objects from the environment (buildings, terrain, ...)
    • Height-dependent velocity profiles according to the standard
    • K-epsilon and K-omega turbulence models
    • Automatic meshing adjusted to the selected depth of detail
    • Parallel calculation with optimal utilization of the performance of multicore computers
    • Results in just minutes for low-resolution simulations (up to 1 million cells)
    • Results within a few hours for simulations with medium/high resolution (1-10 million cells)
    • Graphical display of results on the Clipper/Slicer planes (scalar and vector fields)
    • Graphical representation of streamlines as well as streamline animation
  2. General Data for Generating RFEM/RSTAB Load Cases

    RWIND Simulation | Input

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    001394

    General

    RFEM/RSTAB has a special interface for exporting models (i.e. structures defined by members and surfaces) to RWIND Simulation. In this interface, the wind directions to be analyzed are defined by means of related angular positions about the vertical model axis, and the elevation-dependent wind profile is defined on the basis of a wind standard. Based on these specifications, you can create your own load cases for each angle setting by using fluid parameters, turbulence model properties, and iteration parameters that are all saved globally. These load cases can be extended from STL vector graphics by partial editing in the RWIND Simulation environment using terrain or environment models.

    You can also run the program RWIND simulation manually without the interface application in RFEM/RSTAB. In this case, the structures and terrain environment in RWIND Simulation are directly modeled by importing a vector graphic from an STL file. The elevation-dependent wind profile and other fluid mechanical data can be directly defined in RWIND Simulation.

  3. Considering Terrain Models in RWIND Simulation | © www.sta-con.cz

    RWIND Simulation | Calculation

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    General

    The RWIND Simulation program simulates the defined structures and their environment in a numerical wind tunnel on the basis of a wind profile that is variable by height.

    For this purpose, a freely definable rectangular wind tunnel area with an inlet area as well as an outlet area around the defined structures is defined in the 3D space of RWIND Simulation. The elevation-dependent wind profile is applied to the inlet area.

    To discretize the rigid structure surface, the program usually applies a "shrink-wraping" mesh to the structures. This mesh acts like an "airtight" skin and ensures that the aerodynamics of the structures is not affected by any flow-changing gaps in the original model. The conservation equations to determine the 3D wind flow around the structures are discretized by an adaptive solid mesh that becomes smaller and smaller towards the structures. On the basis of this meshing, the program solves the defined flow problem for the given wind tunnel orientation by means of the Finite Volume Method (FVM) with the free calculation kernel OpenFOAM.

  4. Display of Load Distribution in RFEM

    RWIND Simulation | Output

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    General

    When you start the analysis in the interface program, a batch process starts that puts all member, surface, and solid definitions of the RFEM/RSTAB model rotated with all relevant factors in the numerical RWIND simulation wind tunnel, analyzes the model, and returns the resulting surface pressures as FE node loads or member loads to the respective load cases in RFEM/RSTAB. These load cases containing RWIND Simulation loads can be calculated and combined with other loads in load combinations and result combinations.

    In addition to these resulting load cases in RFEM/RSTAB, more results of the aerodynamics analysis in RWIND Simulation are obtained which display the flow problem as a whole:

    • Pressure on structure surface
    • Pressure field about structure geometry
    • Velocity field about structure geometry
    • Velocity vectors about structure geometry
    • Flow lines about structure geometry
    • Forces on member-shaped structures that were originally generated from member elements
    • Convergence diagram
    • Direction and size of the flow resistance of the defined structures

    These results are displayed in the RWIND Simulation environment and evaluated graphically. Since the flow results about the structure geometry are confusing in the overall display, you can see freely movable section planes for the separate display of the "solid results" in a plane. Accordingly, in the 3D-branched streamline result, an animated display in the form of moving lines or particles is shown in addition to a structural representation. This option helps to represent the wind flow as a dynamic effect.

    All results can be exported as a picture or, especially for the animated results, as a video.

  5. Automatic Preliminary Form-Finding of Membrane Surfaces

    Activating the "Display shape" option in the shortcut menu leads to an automatic preliminary form-finding according to the saved form-finding properties when you change the structure of membrane surfaces. This interactive graphics mode is based on the force density method.

  6. Export Option " Update only materials, thicknesses, and sections

    Updating the Revit Model

    The direct interface with Revit allows you to update the Revit model according to the changes you have made in RFEM or RSTAB. Depending on the modification, the Revit objects may have to be regenerated (deleting the object and subsequent regeneration). The regeneration is performed on the basis of the RFEM/RSTAB model.

    If you want to avoid this regeneration, activate the option "Update only materials, thicknesses, and sections." In this case, only the properties of the objects will be adjusted. Changes differing in material, surface thickness, and section are, however, not considered in this case.

  7. Defining 2 FE Mesh Layers for One Gas Solid

    Considering the Stiffness of Gas Solids in Nonlinear Time History Analysis

    The stiffness of gas given by the ideal gas law pV = nRT can be considered in the nonlinear dynamic analysis.

    The calculation of gas is available for accelerograms and time diagrams for both the explicit analysis and the nonlinear implicit Newmark analysis. To determine the gas behaviour correctly, at least two FE layers for gas solids should be defined.

  8. Defining a Load Eccentricity for a Uniform Member Load

    Eccentricity of Member Loads

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    RFEM Calculation

    For member loads of the load type "Force", you can define eccentricities. You can apply the load eccentricities by means of an absolute or relative offset.

    It is recommended to use the large deformation analysis to consider all effects of eccentric loads.

  9. Graphical and Tabular Display of the Forces of a Line Release

    Display of Forces and Deformations of Hinges and Releases

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    RFEM Results

    RFEM offers the following tables to display forces and deformations of hinges and releases:

    • 4.45 Line Hinges - Deformations
    • 4.46 Line Hinges - Forces
    • 4.47 Member Hinges - Deformations
    • 4.48 Member Hinges - Forces
    • 4.49 Nodal Releases - Deformations
    • 4.50 Nodal Releases - Forces
    • 4.51 Line Releases - Deformations
    • 4.52 Line Releases - Forces

    The tables can be displayed in the prinout report. Moreover, the results in line hinges and line releases can be displayed graphically. It can be controlled by the Project Navigator - Results.

  10. Transfer of Reinforcement from RFEM/RSTAB (Top) to Revit (Bottom)

    Bar Reinforcement Export to Revit

    The reinforcement concept from RF-/CONCRETE Members can be exported to Revit. Rectangular and circular cross-sections are possible at the moment. The reinforcement bars can be modified afterwards in Revit.

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