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Frequently Asked Questions (FAQ)
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AnswerProject Navigator - Results provides a special option to evaluate the results of the RWIND Simulation loads: Activate the results of "Distribution of load" and then select the "Wind load using RWIND Simulation" option.
When importing a model of the *.stl file type, you can specify the length unit used in the file.
During the first import, insufficient attention was paid to the STL file that has been scaled too large by a factor of 1000. The import works without any errors, but a look at the dimensions of the wind tunnel already shows that it is significantly larger than you would expect. Also, you can display the dimensions of the model by right-clicking Model - Edit - Info.
To import the file in the desired scale, it will help you to import this file in the length unit mm. The dimensions of the wind tunnel and the dimensions of the model are in line with expectations.
AnswerDlubal Software has a modular structure. You can compile the software as required. For this, you always need a main program. It is either RSTAB for frame & beam structures, or RFEM for general finite element calculations (beam structures, surfaces, and solid elements). For this, you can configure the required add-on modules depending on your task.
We can give you general recommendations as to which program combination is possible, but it is better to take some time and select the add-on modules according to the specific needs. The add-on modules that are not required can be simply omitted or quickly reordered if necessary. Therefore, you can only buy the product service that you really need. The programs are also available for purchase without any running costs - an advantage in the eyes of many users.
We will be happy to advise you in detail and without obligation. A first step is often to familiarize yourself with the trial version or watch some short videos. You can send us a short e-mail or give a phone call and we will show you where to find what.
If you want to take a look around, you can find the individual solution-related product combinations on our website.In order to get an idea of the price, the webshop provides you with a wide range of package composition options, including online ordering and payment. Before the final order, you always have the option to download the product compilation as a non-binding offer. The short video attached shows you how to do it.
The default path for the RWIND Simulation projects created by RFEM/RSTAB is C:\Users\Public\Documents\Dlubal\RWIND Simulation 1.x\ProjectsRX.
You can adjust this path in the "Program Options" dialog box.
This setting can be found in the menu "Options" → "Program Options," tab "Files and Directories," category "RWIND Simulation projects created by RFEM/RSTAB."
If the model is not placed correctly in the wind tunnel, you can use the "Adjust to Model" function in the wind tunnel properties to place the wind tunnel around the model properly.
In this step, the function arranges the wind tunnel floor at the bottom of the model and places the remaining wind tunnel sides next to the model with a usual distance depending on the model dimension.
AnswerWith the release of the program version RFEM 5.23.01, there is a new option "Simulate and Generate Wind Load" available in the settings of RWIND Simulation. This allows you to export 3ds files inserted in RFEM as a terrain model or a surrounding model to RWIND Simulation. It is also possible to consider an IFC or STEP file imported as CAD/BIM model in RWIND Simulation.
AnswerIf you want to consider the load cases again, please perform a new RWIND Simulation calculation. If you want to perform the calculation of the existing combinations, please remove the RWIND Simulation load cases from the Wind action before deleting the FE mesh, then the combinations are created again and it is possible to perform the calculation.
The activated model simplification allows for RWIND Simulation to generate a "shrink-wrapping" mesh similar to a shrink wrap around the model geometry before the actual finite solid meshing. The program uses the target mesh size of this wrapping mesh from the respectively assigned detail level of the model. This minimum mesh size specifies the finite volume element size in surroundings to the wrapping mesh and additionally specifies the finite volume mesh size distribution between the wrapping mesh on the model and the wind tunnel boundary surfaces in cooperation with the globally defined mesh density. The fine meshing in the model surroundings is necessary for a good determination of the turbulence effect and a real boundary layer distribution.
However, since the resulting pressures on the model geometry are adjusted by transformation at the transition points between the finite volume mesh and the wrapping mesh, the wrapping mesh does not necessarily have to have the same mesh geometry as the enclosing finite volume mesh. This fact allows for an optimization of the wrapping mesh geometry with regard to the number of elements with a variable size distribution to determine the correct geometry.
Such an optimization of the simplified "shrink-wrapping" mesh geometry can be activated in RWIND Simulation by using the optimization option in the model properties. To control the number of elements on the wrapping mesh geometry, you can specify an expected number of elements with the minimum and the maximum limit value in the option properties.
The RWIND Simulation program is a cooperation product of the companies Dlubal Software, PC-Progress, and CFD Support.
RWIND Simulation uses an alternative licensing concept. The following options are available:
- Single-station license with online licensing
- Single-station license with USB dongle (surcharge EUR 150 + VAT)
- Network license with USB network dongle (surcharge 25% on product plus EUR 150 + VAT for USB dongle)
The RWIND Simulation program displays the size of the wind speeds around the model bodies under the Velocity Field result. By displaying this result type, the program automatically switches to the "slicer" display. This display type shows the scalar result, which is spatially available at all positions between the model bodies, only in the area of a plane (slicer).Figure 01 - Wind Comfort AnalysisFor a wind comfort analysis, the wind velocity result at a certain distance to the traffic area is usually required. For this, proceed as follows:
- Activate the Velocity Field result.
- Rotate the slicer planes into a plane parallel to the traffic area to be analyzed.
- In the settings, define the desired distance of the slicer plane to the traffic area by entering a height.
- Activate the Velocity Field result.
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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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