RWIND Simulation - Wind Simulation (Wind Tunnel)
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Generation of Wind Loads Based on CFD for Any Type of Structure
RWIND Simulation is a stand-alone program for numerical simulations of wind flow (digital wind tunnel) around buildings or any other objects and generating wind loads, i.e. forces acting on these objects.
- 3D incompressible wind flow analysis based on OpenFoam solvers
- Direct model import from RFEM/RSTAB or from STL files
- Easy model modification via drag and drop and graphical manipulators
- Automatic corrections of model topology using shrink-wrapping meshes
- Possibility to add surrounding objects (buildings, terrain, ...)
- Elevation-dependent velocity profiles according to the standard
- k-epsilon and k-omega turbulence models
- Automatic meshing adapted to the selected level of detail
- Parallel calculation fully utilizing the performance of multicore PCs
- Results in a few minutes for low resolution simulations (up to 1 million cells)
- Results in a few hours for medium/high resolution simulations (1-10 million cells)
- Graphical display of results on clipper/slicer planes (scalar and vector fields)
- Graphical display of streamlines including flow animation
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 in RFEM/RSTAB. In this case, the structures and terrain environment in RWIND Simulation are directly modelled 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.
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.
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.
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