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Exawind / amr-wind

AMReX-based structured wind solver
https://exawind.github.io/amr-wind
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Error (Tower strike) #1001

Closed AsimUdel closed 5 months ago

AsimUdel commented 6 months ago

Hello, I am trying to run @rybchuk tutorial (https://github.com/rybchuk/amr-wind-tutorial/blob/main/03_turbines.md) by using 4 different actuator methods i.e., (FastDisk, Uniform ct disk, Joukowsky disk and FastLine). In the FastLine actuator method (my simulation terminates after ~9 mins of run) giving me the error about the "Tower Strike" (I am attaching screen shot of the error and output file too). tower_strike error_log_output_file.txt Did someone get this error in past? and how to remove this ? and also I have not find any relation of different level of grid refinement (like grid point in the most refined level in AMR-Wind documentation), if someone knows please guide me to that. Thank you

lawrenceccheung commented 6 months ago

Hi @AsimUdel, Did you change any of the input parameters from the original tutorial file by @rybchuk, other than switching TurbineFastDisk to TurbineFastLine?

One thing that might be an issue is that you are using a larger timestep than recommended for ALM simulations. Typically the dt for actuator line runs might be 0.01 to 0.02 seconds, and the current dt=0.125 seconds might be more suited for actuator disk runs. This is not because of a CFL limitation, but more related to how fast each blade is moving per timestep.

Lawrence

AsimUdel commented 6 months ago

Hi @lawrenceccheung , great question, I did not change any other input parameter, just switched from TurbineFastDisk to TurbineFastLine, and thank you for the valuable information regarding the dt for FastLine (ALM) case, I will keep that in mind.