Search found 26 matches

by KumaraRaja.Eedara
Sat Oct 05, 2019 11:10 am
Forum: Inflow Turbulence
Topic: Rotationally sampled wind
Replies: 2
Views: 166

Re: Rotationally sampled wind

Dear Jason,

I was talking about "Wind1VelX". Thanks for the clarification.

Regards,
Kumara
by KumaraRaja.Eedara
Sat Oct 05, 2019 3:55 am
Forum: Inflow Turbulence
Topic: Rotationally sampled wind
Replies: 2
Views: 166

Rotationally sampled wind

Dear all, After performing simulation (with turbsim generated wind file *.bts as input) in FAST, I've extracted the wind velocities (Vx, Vy, Vz) from the .out file generated by FAST. Is this rotationally sampled wind ? or Eulerian wind measurement (i.e wind measured at an inertial location) ? My und...
by KumaraRaja.Eedara
Sat Jul 20, 2019 9:15 am
Forum: Rotor Aerodynamics
Topic: Difference in the torque value computed from tangential forces and RotTorque output from Elastodyn_BDoutputs file
Replies: 10
Views: 3584

Re: Difference in the torque value computed from tangential forces and RotTorque output from Elastodyn_BDoutputs file

Dear Jason, I have written Matlab code for calculating aerodynamic forces; I am comparing with the FAST results ( AeroDynV15 used). I have NOT accounted for induction factors in my code. For a uniform wind speed case, I see good correlation between my results and FAST results, in rotor speed, alpha,...
by KumaraRaja.Eedara
Fri Jul 19, 2019 11:21 pm
Forum: Computer-Aided Engineering Software Tools
Topic: AeroDyn error
Replies: 11
Views: 2944

Re: AeroDyn error

Thanks for pointing that out Jason. I forgot to set "CompAero" to 2.

Regards,
Kumara
by KumaraRaja.Eedara
Fri Jul 19, 2019 2:23 pm
Forum: Computer-Aided Engineering Software Tools
Topic: AeroDyn error
Replies: 11
Views: 2944

Re: AeroDyn error

Dear all, I am able to run a simulation without any errors using AeroDynV14, when i replace it with AeroDynV15 I see the following error. Attached AerodynV15 file I'm using. FAST_InitializeAll:ED_Init:ED_ReadInput:ReadBladeInputs:ReadBladeMeshFileAD:Invalid numerical input for file "E:\FAST\Wor...
by KumaraRaja.Eedara
Wed Jul 17, 2019 12:28 am
Forum: Computer-Aided Engineering Software Tools
Topic: Creating wind speed without turbulent
Replies: 5
Views: 1803

Re: Creating wind speed without turbulent

Thanks, Jason. The post mentioned below from https://wind.nrel.gov/forum/wind/viewtopic.php?f=4&t=908&p=4229 is really helpful. Dear Yiqing, For simple wind time histories, such as step changs in the wind speed, AeroDyn's simple "hub-height" format wind data file can be used in pla...
by KumaraRaja.Eedara
Tue Jul 16, 2019 2:29 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Creating wind speed without turbulent
Replies: 5
Views: 1803

Re: Creating wind speed without turbulent

Dear Jason, I want to create a uniform wind (i.e same wind speed across the disk) and also constant with respect to time. To create uniform wind file I've selected 2 for 'wind type' in "InflowWind.dat". This requires '***.hh' as input right? As per my understanding AeroDynV13 has this opti...
by KumaraRaja.Eedara
Tue Jul 16, 2019 8:28 am
Forum: Rotor Aerodynamics
Topic: AeroDyn v.14 (VT, CNN, CTT)
Replies: 8
Views: 4052

Re: AeroDyn v.14 (VT, CNN, CTT)

Thanks, Jason. That was oversight from my side. I've attached figure here for making it more easy to see. The output is written to a file "filename.AD.out".
AerodynV14_PrntOutput.JPG
AerodynV14_PrntOutput.JPG (175.18 KiB) Viewed 502 times


Regards,
Kumara
by KumaraRaja.Eedara
Tue Jul 16, 2019 5:46 am
Forum: Rotor Aerodynamics
Topic: AeroDyn v.14 (VT, CNN, CTT)
Replies: 8
Views: 4052

Re: AeroDyn v.14 (Output channels)

Dear all,

I'm using AeroDyn v.14.. Is it possible to print the outputs of aerodynamic quantities like angle of attack, lift coefficient etc at each airfoil section. It seems possible in AeroDyn v.15 . But is it possible using v.14? If yes, how? Thanks.

Regards,
Kumara
by KumaraRaja.Eedara
Mon Jul 15, 2019 1:14 am
Forum: Controls
Topic: questions about reference control input
Replies: 61
Views: 14306

Re: questions about reference control input

Thanks, Jason. That is helpful. Basically clock-wise rotations about -z axis of blade coordinate system (Fig 9, pg 10 FAST manual) are positive (for both pitch and twist). For an up-wind turbine such a rotation causes leading edge more into upwind.
by KumaraRaja.Eedara
Fri Jul 12, 2019 3:00 pm
Forum: Controls
Topic: questions about reference control input
Replies: 61
Views: 14306

Re: questions about reference control input

Dear Jason, One more question, rather would like to confirm my understanding. In the input file to FAST (AeroDynV14), for each blade, the 'AeroTwst' align with chord,structural twist etc,is specified at different blade sections. And I observed that 'AeroTwst' value decreases from root section to tip...
by KumaraRaja.Eedara
Fri Jul 12, 2019 2:23 pm
Forum: Controls
Topic: questions about reference control input
Replies: 61
Views: 14306

Re: questions about reference control input

Dear Jason, I understand this part of reply from you completely, but, I have one more question: Dear Kamineni, I would say that the angle (about minus z) from the rotor plane to the chord equals pitch + aerodynamic twist. Likewise, I would say that the angle (about minus z) from the rotor plane to t...
by KumaraRaja.Eedara
Tue Jan 02, 2018 6:44 am
Forum: Structural Analysis
Topic: Connection between tower and nacelle
Replies: 4
Views: 2620

Re: Connection between tower and nacelle

Ok, Thanks Jason.
by KumaraRaja.Eedara
Mon Jan 01, 2018 11:54 am
Forum: Structural Analysis
Topic: Connection between tower and nacelle
Replies: 4
Views: 2620

Re: Connection between tower and nacelle

Dear Jason, I'm assuming inner race of yaw-bearing is rigidly attached to the Nacelle and outer-race is rigidly attached to the tower nearly top (ref Fig 01). Strictly speaking, the inner race will have motion relative to the outer race (i.e in xy-plane) due to elasticity of the bearings. It might b...
by KumaraRaja.Eedara
Sun Dec 31, 2017 12:53 pm
Forum: Structural Analysis
Topic: Connection between tower and nacelle
Replies: 4
Views: 2620

Connection between tower and nacelle

Hi, Is it possible to model connection between tower and nacelle (base plate) connection shown in the figure attached herewith. I understand that its revolute joint with rotation about yaw axis. Suppose, wind turbine is locked in a particular position (i.e no yaw is allowed or required),I would like...

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