Forum
Important Notice for New User Registrations
To combat an increasing number of spam and bot registrations, we now manually approve all new user registrations. While this may cause a delay until your account is approved, this step is essential to ensure the quality and security of this forum.
To help us verify your registration as legitimate, please use a clear name as user name or an official email address (such as a work, university, or similar address). If you’re concerned that we may not recognize your registration as non-spam, feel free to email us at with a request to approve your username.
Turbine Aerodynamic Visualization Output
Hello QBlade R&D team, I am using the NREL 5MW wind turbine qpr wind turbine model provided on the official website to study the impact of different wind shear factors on wind turbine performance. By using the FVW wake modeling method, this study investigates the effect of different wind shear exponents(WSE) on the wake shape behind the wind turbine nacelle. Among them, both the trailing vortex and the shedding vortex of the wind turbine are checked and opened, and the shape of the wind turbine’s wake is shown in the figure,
I would like to ask how to operate to obtain a result graph similar to other literature, as shown in the following figure:
- You need to login to have access to uploads.
Hello,
there is no default function to generate a plot similar to the one you have attached.
However, you can achieve a similar visualization by post-processing the wake data.
To do this, export velocity cut-planes for post-processing in ParaView or similar software. This approach allows you to visualize the wake vorticity, effectively highlighting the tip and root vortices.
BR,
David
Thank you very much for your reply! Since my knowledge of QBlade software is limited, I would like to clarify further, does the “export velocity cut-planes” in your reply refer to the operation in the picture below? In practice, I found that in QBlade, I can output the velocity vectors on a certain plane by checking the “Cut Plane” box, and then I can output the Turbine Simulation as a .cut file. The example data in the .cut file is shown in the figure below, and stores only the geometry and accuracy parameters of the flow field, but does not include the velocities of any vortex points. How can this be accomplished by Paraview post-processing software to schematize the tip vortices and root vortices? Can you please be more detailed, thank you very much for your reply!
Uploaded files:
- You need to login to have access to uploads.
Hello,
the .cut file you mentioned does not contain the velocity data of the cut-plane. Instead, it holds the geometric definition of the cut-plane itself. This .cut definition can be used to automate the generation of cut-planes across multiple simulations.
To export the velocity data from the cut-plane you have to click on the *Export Current Cut Plane* button in the Dock Window. You then have the option to export the cut-plane data either in a .txt format or in the .vtu (VTK unstructured XML) format, which can directly be imported by ParaView.
BR,
David
Uploaded files:- You need to login to have access to uploads.
Thanks again for your reply, I have successfully exported the cut-plane data of the XOY plane i.e. the plane along the streamwise direction to .vtu format by the method you have mentioned. The created plane data as well as the .vtu data are shown below respectively. The .vtu format file can indeed be recognized and read by the post-processing software Paraview. The results are shown below. The generated .vtu file contains a visualization of the blades and pylons, and should also contain other information about the planes such as speed or vortex structure. Unfortunately, I still have not been able to complete the visualization of the trailing edge behind the WTG in Paraview. So I will have to ask you again. I hope I am not disturbing you and look forward to your reply!
Uploaded files:- You need to login to have access to uploads.
Hello,
it looks like you are almost there!
The velocity data is included in the “XOY_Velocity_Field_data.vtu” object. When you select this object in ParaView, you can choose from a drop-down menu which quantity should be plotted. Additionally, ParaView allows you to apply various filters or post-processing methods to the velocity field to highlight vortex structures, among other features.
I suggest checking out ParaView’s documentation or watching some online video tutorials on how to perform these tasks in ParaView. There are quite a few excellent resources available.
Best,
David
Dear David,
I would like to know more on how to create the 3D velocity field in Paraview as shown in your report (attached jpeg picture)? when I clicked on the “Export Velocity Field” button in QBlade, it gives the “velocity.vtr” and vtu file of blade and tower. Is the file “velocity.vtr” supposed showing the 3D velocity information? Is the velocity field export from QBlade can be shown as vectors (with arrow) in Paraview? And may I know what is the difference of the button of Export cut plane vtr file and Export Velocity field vtr file? Is it possible to output all the time step velocity field at once?
thank you very much
Chris
Uploaded files:- You need to login to have access to uploads.
Hi Chris,
the velocity cut-plane export the velocity information in a user defined plane. The velocity field exports velocities in a 3D rectangular volume.
In ParaView the velocity information from QBlade can be post-processes in many ways, e.g. by computing Q-criterion, vorticity or other metrics and by generating streamlines, volumetric renderings etc. Please refer to the ParaView documentation on how to achieve this.
It is also possible to export cut-planes or velocity fields for every timestep of a simulation if the replay has been saved. To do this you need to tick the checkbox “+ all next”.
BR,
David
Uploaded files:
- You need to login to have access to uploads.
Thank you very much David.
Chris
