Search found 4 matches

by Haoyu.Wu
Sat Dec 14, 2019 11:03 pm
Forum: Rotor Aerodynamics
Topic: How to simulate turbine shutdown correctly
Replies: 4
Views: 1000

Re: How to simulate turbine shutdown correctly

Dear Haoyu.Wu, Getting warnings regarding a "small angle assumption violated" or "NaNs" in the output are suggestive of a physical or numerical instability in your simulation. Changing the source code is likely not the solution. Changing the input settings will likely solve the ...
by Haoyu.Wu
Sat Dec 14, 2019 6:40 am
Forum: Rotor Aerodynamics
Topic: How to simulate turbine shutdown correctly
Replies: 4
Views: 1000

Re: How to simulate turbine shutdown correctly

Dear Haoyu, You should set WakeMod = 1 (or 2 for DBEMT) when simulating a shutdown case because the WakeMod = 0 option is not valid when the turbine is operating. The error regarding "no valid value of phi" was fixed in versions of AeroDyn v15 newer than from FAST v8.16. I suggest that yo...
by Haoyu.Wu
Fri Dec 13, 2019 5:06 am
Forum: Rotor Aerodynamics
Topic: How to simulate turbine shutdown correctly
Replies: 4
Views: 1000

How to simulate turbine shutdown correctly

Hello everyone. I want to simulate turbine shutdown at a given time by pitching the blades. When I set the value of 'WakeMod' to '1', FAST aborted after the simulated time of turbine shutdown and warned 'There is no valid value of phi for these operating conditions'. So I have to set the value of 'W...
by Haoyu.Wu
Sat Sep 21, 2019 11:17 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Simulation in HydroDyn of the wave with heading direction in range (180,360)
Replies: 1
Views: 518

Simulation in HydroDyn of the wave with heading direction in range (180,360)

Hello everyone. I am simulating the response of TLP FOWT in FAST. HydroDyn requires that WaveDir must be in the range (-180,180]. However, the .3, .12d, .12s file calculated by Wadam is in the wave direction of range [0,360]. So I came across an error when simulating the WaveDir of 210. Then I chang...

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