Strange step in my velocity profiles

[justhawk98]

Hi everyone,
Recently, I've been trying to recreate results given in this paper by @tonyinme since he uses LES and an actuator line model to represent the NREL 5MW, something I am also trying to do. I've gone through several iterations and am getting much better results than when I started but I am still seeing a strange step in my velocity profiles at around 0.25 rotor diameters. See below:

Has anyone else encountered this or know what could be causing it? Could it just be a function of my OpenFAST files? I've attached a .zip file containing my AMR-Wind input as well as my OpenFAST files. I use the freestream model so anyone should be able to run it without doing a precursor. Also shown below are a snapshot of the x-velocity after 720 seconds of runtime and a screenshot of my mesh. Any advice is appreciated.

step_report.zip

[marchdf]

@tonyinme any thoughts on the above?

[tonyinme]

Hi @justhawk98 , your input files look consistent with the simulation setup.

Your input files have epsilon = 4.2 m. So you should be comparing your data to the top plot in Figure 8.

Your velocity profiles (orange) look consistent with Figure 8 of that paper.
The blue line looks different. Where is the data for the blue line coming from?

Also, I think you should set the tower points in amr-wind to zero, or to the same number in the aerodyn input files.
Actuator.T0.num_points_tower = 10

Let me know if that helps.