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• ### Which load direction should I selected for members and surfaces in the case of a wind load?

For the load direction from a wind load, you should select "Local z." This assumption is based on the fact that the wind load is usually shown perpendicular to the load plane in all standards.
• ### Where can I define a wind velocity diagram according to a specific wind standard for the numerical wind tunnel analysis in RWIND Simulation?

In RWIND Simulation, the wind velocity is organized by means of the height of the wind tunnel inlet in a table, depending on the height coordinates and wind speeds. You can enter the data in this table manually in RWIND, or by using specific function generators.

If you do not create the model directly in RWIND Simulation, but transfer it from RFEM or RSTAB to RWIND Simulation, you can also define the wind velocity diagram in the interface window according to one of the available wind standards:
• EN 1991-1-4
• ASCE/SEI 7-16
• NBC 2015
The wind velocity diagram then results from the respective standard parameters (zone, terrain category, and so on).

• ### Which formula is used in the RF‑/TOWER Loading add-on module to calculate the first natural frequency for the determination of the structure coefficient?

The first natural frequency is required to determine the structure coefficient. It is not determined by using a generalized formula, but the integrated eigenvalue solver RF‑/DYNAM, taking into account the real mass distribution and displaying the results in Column A of Table 2.3.

• ### I have manually defined a snow load of 5 kN/m² in the RX‑TIMBER program. However, the calculation uses a load of 4 kN/m². Why is the defined snow load not applied?

According to EN 1991‑1‑3, the snow load must be multiplied by the factor of 0.8 for the snow load on a roof. Therefore, the following load results:

sk = 5 kN/m² × 0.8 = 4 kN/m²

If the load has already been calculated for the roof, you can enter the load completely under the user-defined loads. This is shown in Figure 01 and in the video.

• ### How can I extend an active license of RWIND Simulation based on a software key online before the activation period expires?

The RWIND Simulation program is protected against unauthorized use. If the software key is authorized, the program is only authorized for a specific activation period, which must be defined by the user. After this period, the program automatically switches to the demo mode; the previously used license is freely availablea gain for a new activation. To avoid the reactivation on the same single‑user computer, it is possible to renew the license online (a computer is connected to the Internet) by specifying a new activation period before the activation period expires. Proceed as follows:

1. Run RWIND Simulation "As Administrator." To do this, right-click the RWIND Simulation icon and select "Run As Administrator."

2. Select the "RWIND Simulation - License and Authorization" function in the "Help" menu.

This opens the "RWIND Simulation 1.xx Authorization Status" dialog box.

3. Check in the "RWIND Simulation 1.xx Authorization Status" dialog box if an active software key authorization is available. This is the case if the "Software Key" option is selected in the "Authorization Method" section, and an active authorization is indicated by a green dot in the "Authorization Status" section.

If the check is negative, and a red dot is displayed, no RWIND Simulation license based on a software key is activated on the single-user computer. As a result, the activation period for a license cannot be extended.

If the requirements mentioned above are met, click the "Extend Activation Online" button. The "Extend Activation Online" dialog box appears.

4. The "Extend Activation Online" dialog box shows the license specification to be extended.

Enter your online activation key based on your contract documents and define the new activation period in the date field.

Then, click the "Extend Activation Now" function to run the online extension.

This opens the "RWIND Simulation 1.xx" dialog box.

5. In the "RWIND Simulation 1.xx" dialog with the confirmation prompt about the planned modification, click "OK" to finally change the activation period.

After successfully changing the activation period, you receive a confirmation message and can use the program without restrictions.
Thus, your purchased license is used in our system for the newly defined activation period. During this time, it is not possible to activate the RWIND Simulation program with the activation key on any other computer. The assignment of the license in our system ends with a proper deactivation or after the defined activation period has expired.

To avoid unnecessary license assignments in our system due to unexpected computer problems on your part (defect, loss, hardware replacement, employee change, and so on), we recommend you to keep the activation period as short as possible.

• ### How can I authorize the RWIND Simulation program offline with a software key on a single‑user computer via e‑mail?

The program RWIND Simulation is protected against unauthorized use. The program can be authorized offline (a computer is not connected to the Internet) with the activation by e‑mail. Proceed as follows:

1. Run RWIND Simulation "As Administrator." To do this, right-click the RWIND Simulation icon and select "Run As Administrator."

2. Confirm the authorization check with the "Activate Now" function.

This opens the "RWIND Simulation 1.xx Demo Authorization Status" dialog box.

3. In the "RWIND Simulation 1.xx Demo Authorization Status" dialog box, select the "Software Key" option in the Authorization Method area and click the "Activation via E-Mail" function in the lower part.

This opens the "Activation by E-Mail" dialog box.

Furthermore, enter a user-defined description of the workstation to be activated under "Description of Workspace" and the RWIND Simulation level with an expiry date of the activation to be carried out under "Required Authorization."

Then, click the "Generate Request Code" function to confirm your entries.

This opens the "RWIND Simulation 1.xx Demo" dialog box.

5. Check the data entered in the "RWIND Simulation 1.xx Demo" dialog box. If they comply, click "OK" to confirm the dialog box.

This opens the "Activation by E-Mail" dialog box.

6. The "Activation by E-Mail" dialog box consists of three parts. In the "Step 2" tab, the required request code is displayed on the left. Copy this text block to the Windows clipboard with the "Copy Request Code" function and then paste the code into a blank e‑mail with [Ctrl]+[V] or the Windows paste function. Send this e‑mail to support@dlubal.com for further processing.

7. You will receive an activation code from us. In the dialog box, go to the "Step 3" tab and enter this code in the "Activation Code" text box.

Then, click the "Activate Now" function to run the activation process.

After the successful authorization, you will receive a confirmation message and it is possible to use the program without any restrictions.
This offline e‑mail activation uses your purchased license for the defined activation period in our system. During this time, it is not possible to activate the RWIND Simulation program with the license on any other computer. The assignment of the license in our system ends with a proper deactivation or after the defined activation period has expired.

Then, the activation process can be carried out again on the same or a different computer. Please note that the e‑mail request codes can only be used once for the activation. To reactivate, a new request code must always be sent to us.

To avoid unnecessary license assignments in our system due to unexpected computer problems on your part (defect, loss, hardware replacement, employee change, and so on), we recommend you to keep the activation period as short as possible.

• ### Where can I get the hash code based on my e-mail address for using the web service function in the background of the Geo-zone tool "Snow, Wind, and Seismic Zone Maps"?

In addition to the components for describing the load type, location, and language, the request URL address also includes the components for describing the user's identity. The "login" component describes the user's e-mail address and the "hash" component describes a hidden password. To ensure the login works, it is necessary to save the e-mail address in a valid Dlubal account.

If you do not have a Dlubal account yet, you can create it on this page:

https://www.dlubal.com/en-US/extranet/create-new-account

After having successfully logged onto your Dlubal Account in the top left corner of our website,

https://www.dlubal.com/en-US

the "My Account" page opens. At the bottom of the "User Data" section, you can find the identity components "login" and "hash" for using the Geo-Zone Tool web service function.

• ### Is it possible to design a "Kármán vortex street" behind an object in the numerical wind tunnel of RWIND Simulation?

In the RWIND Simulation program, a stationary flow analysis of incompressible gases is implemented. The principles and formulations used for this do not change over time. Thus, the calculation gives a result set without temporal variation.

[1] The effect of a "Kármán vortex street," in which counter-rotating vortices develop behind a body around which flows, results in a temporal change of the flow effect. Therefore, this fluid-mechanical effect cannot be simulated in RWIND Simulation.

• ### How do I determine wind loads on structures of any shape?

The new stand-alone program RWIND Simulation provides you with the options for wind simulation and for generating wind loads. The options can be optimally utilized in conjunction with the FEM structural analysis software RFEM or the structural frame analysis software RSTAB.

###### Input
The direct import of models from RFEM or RSTAB allows you to determine the relevant parameters of the wind directions to be analyzed with height-dependent wind profiles on the basis of a wind standard. This results in the corresponding load cases with globally defined parameters.

You can also run RWIND Simulation manually without RFEM or RSTAB. Furthermore, it is possible to import the data from STL vector graphics.

The import of terrain and buildings of the environment into the simulation is also possible from STL files.

By exchanging the data between RFEM or RSTAB and RWIND Simulation, you can easily use the wind analysis results as load cases in the usual RFEM or RSTAB work environment.

###### Features of RWIND Simulation
• 3D incompressible wind flow analysis with OpenFoam solvers
• Direct model import of RFEM or RSTAB or STL files
• Simple model changes using Drag and Drop and graphical adjustment assistance
• Automatic corrections of the model topology with shrink wrap networks
• 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 mesh generating adjusted to the selected depth of detail
• Parallel calculation with optimal utilization of the capacity 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 display of streamlines and streamline animation

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If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

#### 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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