hi All,
I have been using the Simulink examples that come with FAST. I was wondering how I plot the wind velocity after the simulation is complete in MATLAB?
Thanks
Amit
hi All,
I have been using the Simulink examples that come with FAST. I was wondering how I plot the wind velocity after the simulation is complete in MATLAB?
Thanks
Amit
Dear Amit,
If you’ve added the wind speed (e.g., WindVxi) to the FAST OutList before running the simulation in Simulink, you can access the wind speed output from the MATLAB workspace just like with the other FAST outputs.
Best regards,
Thanks, Jason.
Best,
Amit
Hi Jason
If I need to use the Wind output from FAST to an external CFD program to calculate the time varying pressure on 5 MW blade, then should I use below output values exported by FAST?
WindVxi
WindVyi
WindVzi
If these are correct parameters then can you describe the xi-y-zi coordinate system orientation so that these values can be correctly applied in CFD tool?
Is there any diagram / paper where the FAST-CFD linkage is used?
-Thanks and Best Regards
Pravin Kulkarni
Hi Jason
Basically I want to know if I should be using FAST output values WindVxi, WindVyi, WindVzi OR TurbSim output wind speed U,V, W to calculate the pressure loads on the blade using CFD tool. My aim is to generate 10 min average wind speed, calculate pressure in CFD using these speed components as input and then find fatigue life of blade.
Also I found that neither of these sets of values (WindVxi, WindVyi, WindVzi or U,V,W) follow the Weibull distribution. As per TurbSim and FAST theory, should they be following this distribution?
Eagerly awaiting your reply.
-Best Regards
Pravin
Dear Pravin,
I’m not really sure I understand what you are trying to do. A few comments:
I hope that helps.
Best regards,
Thanks Jason as always for quick and clear answer !.
My purpose is to analyze a single blade and not go for wind farm or spatio-temporal scope. I want to calculate time varying loads or pressure on the 17 sections of NREL 5 MW land based blade and do fatigue analysis in Ansys. Based on the discussion so far with you, here is the summary of options
For option 2 I could calculate the equivalent loads for each section as per Yahya’s suggestion http://forums.nrel.gov/t/stress-analysis-of-blades-and-a-tower/489/1. However I was thinking of having a way to calculate pressure on airfoils instead of point loads. If there is no other option then should I go with option 2 above?
Secondly, if I want to use time-domain method (weibul wind—>rainflow counting—>stress range–>Fatigue life analysis process) instead of spectral density method then is there any way to calculate wind velocity components?. I believe TubSim is a spectral analysis tool
-Best Regards
Pravin
Dear Pravin,
Option 2 is the approach commonly employed in industry, although as I’ve said in prior posts, I don’t know all of the details.
I’m not sure I understand your second question, but the time-domain approach is the one commonly employed in industry.
Best regards,