OpenFAST
FAST.Farm Wake Visualization Display Issue
During the process of handling visualization in simulation animation, I noticed that the wake would suddenly disappear or be cut off in a plane during certain periods of time, as shown in the red box in the figure. Why does this phenomenon occur? Is this phenomenon reasonable?Looking forward to the valuable guidance from the experts. Thank you!
This is related to #2757
Thank you very much. Another question, still about this simulation (3 wind turbines arranged in a straight line). The simulation results output RtCtAvgT1, RtCtAvgT2, RtCtAvgT3, but i found that their values are all 0. I guess there is an error in my simulation settings? Please guide me! Thank you!
What you are observing in your slices through the flowfield is expected under the current FAST.Farm implementation. One of the parameters you set on your FAST.Farm input is the number of planes NumPlanes where the wake will be propaged to. Once it reaches the number of planes, the wake stops. It is important that the user picks the appropriate number of planes for the case at hand. The linked issue above outlines ways to mitigate this inherent approach used by FAST.Farm.
Regarding your second question, you will have to give more details of your setup for us to help. How does the rotor c_t (and not the average one) look? How does the power output look? Is the turbine seeing the correct flowfield? Are you using any controller?
What you are observing in your slices through the flowfield is expected under the current FAST.Farm implementation. One of the parameters you set on your FAST.Farm input is the number of planes
NumPlaneswhere the wake will be propaged to. Once it reaches the number of planes, the wake stops. It is important that the user picks the appropriate number of planes for the case at hand. The linked issue above outlines ways to mitigate this inherent approach used by FAST.Farm.Regarding your second question, you will have to give more details of your setup for us to help. How does the rotor c_t (and not the average one) look? How does the power output look? Is the turbine seeing the correct flowfield? Are you using any controller?
Thanks for your reply.
As shown in the figure, they are the FAST. Farm configuration file and a wind turbine's configuration file (the three wind turbines have the same settings).
The controller remains unchanged and is the official one provided. The simulation scenario is three wind turbines arranged in a straight line in turbulent wind to observe wakes.
Please help me check if my simulation settings are reasonable. Thank you so much!
Dear @chendiandian421.
Based on my quick skim of your input files, I don't see any reason why the rotor-disk averaged thrust would be reported as zero. Are you sure you are accessing the correct output column from the FAST.Farm output file? Are there other outputs that are not what you expect them to be?
Best regards,
