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 to the exact model wrapping mesh in a further step. If the triangular meshing of the exact model mesh geometry is too rough, the last transformation process initiates a partial refinement of the exact model wrapping mesh.
Question
How does RWIND Simulation determine the pressure due to wind load on model surfaces?
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 to the exact model wrapping mesh in a further step. If the triangular meshing of the exact model mesh geometry is too rough, the last transformation process initiates a partial refinement of the exact model wrapping mesh.
![Figure 1: Validation Example Model](/en/webimage/046033/3651680/006.jpg?mw=512&hash=024c9db11178358cdab5075631e47165e2e4f513)
![Figure 1: The Effect of the Wind Direction](/en/webimage/044683/3627810/005.jpg?mw=512&hash=030e1c50257d7fa96f0e7ffc96c49be2668cfd9f)
![Figure 1: Wind Simulation on a Modern City Using RWIND](/en/webimage/042766/3563251/10.png?mw=512&hash=fe9104cccd682c4804f57c32af54a6db2de16ef8)
![Feature 002819 | Flow Field Quantities](/en/webimage/050342/3881104/1.png?mw=512&hash=9d7f6c198b6d4ae6ee8f2fa8bca75f85579e14c9)
In RFEM and RSTAB, you can visualize the flow field quantities of pressure, velocity, turbulence kinetic energy, and turbulence dissipation rate for the wind simulation.
The clipping planes are aligned with the respective wind direction.
![Feature 002746 | Application of Wind Loads from Experimentally Determined Pressure Values](/en/webimage/047175/3688544/47175.png?mw=512&hash=92558eee30ca35a36317ae0c81415eb079ba4e72)
If you have experimentally determined surface pressures available for a model, you can apply them to a structural model in RFEM 6, process them in RWIND 2, and use them as wind loads in the structural analysis of RFEM 6.
You can find out how to apply the experimentally determined values in this Knowledge Base article: Static Analysis with Wind Loads from Experimentally Measured Pressures Using RWIND 2 and RFEM 6
![Feature 002649 | Displaying RWIND Results Directly in RFEM 6](/en/webimage/043004/3572831/2023-08-15-07-12-55.png?mw=512&hash=0b716b063ad4126a4590e42d13a7a1974c015cac)
You can display the RWIND results directly in the main program. In the Navigator - Results, select the Wind Simulation Analysis result type from the list above.
Currently, the following results are available, which refer to the RWIND computational mesh:
- Surface pressure
- Surface cp coefficient
- Wall distance y+ (steady flow)
![Feature 002551 | Freely Adjustable Wind Permeability for Surfaces](/en/webimage/035403/3435909/35403_EN.png?mw=512&hash=e357887a3f1c878d13b4cfc9eb821533b9c3bc05)
Use RWIND 2 Pro to easily apply a permeability to a surface. All you need is the definition of
- the Darcy coefficient D,
- the inertial coefficient I, and
- the length of the porous medium in the direction of flow L,
to define a pressure boundary condition between the front and back of a porous zone. Due to this setting, you obtain the flow through this zone with a two-part result display on both sides of the zone area.
But that's not all. Furthermore, the generation of a simplified model recognizes permeable zones and takes into account the corresponding openings in the model coating. Can you waive an elaborate geometric modeling of the porous element? Understandable – we have good news for you then! With a pure definition of the permeability parameters, you can avoid complex geometric modeling of the porous element. Use this feature to simulate permeable scaffolding, dust curtains, mesh structures, and so on.
More Information