Static Anlysis

Discuss theory and modeling of wind-turbine structures.

Moderator: Bonnie.Jonkman

Krishnaveni.Balakrishnan
Posts: 20
Joined: Mon Feb 11, 2019 10:31 am
Organization: University of Massachusetts
Location: United States

Static Anlysis

Postby Krishnaveni.Balakrishnan » Sat Nov 02, 2019 1:18 pm

Greetings to everyone in the forum.
I have a quick question in FAST. can we run a static analysis in it, that is with zero wind ,wave and currents?

Jason.Jonkman
Posts: 4338
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: Static Anlysis

Postby Jason.Jonkman » Sun Nov 03, 2019 12:47 pm

Dear Krishnaveni,

There is no way in FAST to solve for the static-equilibrium position directly (without a time-domain simulation), but you can certainly set the wind speed and sea current to zero, set still water, and run a time-domain simulation to find the static-equilibrium position.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Krishnaveni.Balakrishnan
Posts: 20
Joined: Mon Feb 11, 2019 10:31 am
Organization: University of Massachusetts
Location: United States

Re: Static Anlysis

Postby Krishnaveni.Balakrishnan » Sun Nov 03, 2019 2:21 pm

Dear Dr.Jonkman

Thank you for your response and continued support as always.I tried to simulate default OC3 Hywind model with Uref =0m/s ,current velocity CurrNSV0 = 0m/s and still water with 0 Tp and Hs. I got the following error message. But when I set all these parameters to a very minimal value of about 0.0001 , I could able to run the simulation. I would like to get your advice on this.


Error message:
Running InflowWind (v3.03.00, 26-Jul-2016).
Opening InflowWind input file: .\test_case__static_V0_Seed1_inflow.dat

FAST_InitializeAll:InflowWind_Init:Steady_ValidateInput: Horizontal wind speed (HWindSpeed) for
steady winds must be greater than zero.

 FAST encountered an error during module initialization.
Simulation error level: FATAL ERROR

Aborting FAST.


Thanks
Krishnaveni

Jason.Jonkman
Posts: 4338
Joined: Thu Nov 03, 2005 4:38 pm
Location: Boulder, CO
Contact:

Re: Static Anlysis

Postby Jason.Jonkman » Sun Nov 03, 2019 11:45 pm

Dear Krishnaveni,

I'm not sure why InflowWind doesn't like HWindSpeed set to exactly zero, but it sounds like you found a suitable workaround. You can also disable InflowWInd altogether (which forces the wind speed to zero) by setting CompInflow = 0. If you wish to eliminate aerodynamic loads altogether (instead of using still-air aerodynamics, which still includes aerodynamic loads associated with structural velocities), you can disable AeroDyn by setting CompAero = 0.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
15013 Denver West Parkway | Golden, CO 80401
+1 (303) 384 – 7026 | Fax: +1 (303) 384 – 6901
nwtc.nrel.gov

Krishnaveni.Balakrishnan
Posts: 20
Joined: Mon Feb 11, 2019 10:31 am
Organization: University of Massachusetts
Location: United States

Re: Static Anlysis

Postby Krishnaveni.Balakrishnan » Mon Nov 04, 2019 5:19 am

Thank you so much for your guidance Dr.Jonkman. Highly appreciate it.


Return to “Structural Analysis”

Who is online

Users browsing this forum: No registered users and 1 guest