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The output of the wake
Dear all,
I want to know whether there are channels to output wake results, such as Y-Z wake plane velocity distributed along the X-axis, vorticity distribution, shedding vorticity, trailing vorticity and other similar parameters.
Thanks
Hi,
wake velocity data can be exported via “velocity cut planes”.
At first you need to activate the option in the dock – then you can create and export velocity cut planes for a completed simulation.
If you store the replay of a simulation you can export cut planes at each stored timestep. Cut planes can be exported to .txt files or .vtu files that can directly be inspected with Paraview.
BR,
David
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Thank you for your answer, this feature is really great, give you a thumbs up.
Dear David,
Hello, may I ask:
I divided the blade into 18 panels. Through calculation, I obtained the bound vorticity of 0 to 17 panels on the blade 1.
Through the simulation image, I found two trailing vortex lines pulled out from the blade tip. I would like to ask whether the bound vortexes in section 17 are located in the blue or yellow position of the image I drew.
In addition, I would like to know how these two trailing vortex lines are calculated through the bound vortexes. Is it the attachment vortex of panel 17 minus panel 16 that gives the trailing vortex between them? What is the trailing vortex at the blade tip?
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Hi,
I think I dont really understand your question, but please have a look at our documentation: https://docs.qblade.org/src/theory/aerodynamics/lifting_line/lifting_line.html to clarify this.
Best,
David
Hi David,
Through calculation, I find that the longer the simulation time is, the longer the distance of wake along x will be, but it will be truncated at a certain distance.
I want to get the wake field of 10 times the rotor diameter through simulation, and get the Y-Z plane at each time the impeller diameter. How to set it?
Dear David
Could you please help me to answer the above questions?
Thank you very much.
Best wishes,
Yinong
Hi Rob,
please check out the documentation on the vortex wake settings here: https://docs.qblade.org/src/user/turbine/aerodynamic.html#free-vortex-wake-parameters
There all parameters regarding the vortex wake settings (and how the cut-off length is affected) are explained. When running the sim you should store the replay of the simulation. After the simulation is finished you can then export the wake data at any location for all timesteps of the simulation.
BR,
David
