Search found 28 matches

by Pat.Moriarty
Thu Jan 31, 2019 4:32 pm
Forum: UAE Phase VI Data
Topic: UAE Phase VI data now easily downloadable
Replies: 0
Views: 2466

UAE Phase VI data now easily downloadable

Hello all,

We are pleased to announce that the entirety of the UAE Phase VI data set is now available for download at the DOE A2e Data Archive and Portal.

cheers,
Pat
by Pat.Moriarty
Tue Oct 30, 2018 9:26 am
Forum: SWiFT Benchmarks
Topic: SWiFT benchmark kickoff meeting
Replies: 0
Views: 3079

SWiFT benchmark kickoff meeting

Hello all, The SWiFT benchmark was released this morning via webinar. Slides can be found here . Detailed information on the benchmark and timeline can be found here . Two questions arose during the webinar: 1. Deadline to sign up for benchmark? We would prefer people would sign up before the next m...
by Pat.Moriarty
Tue Jun 07, 2011 3:29 pm
Forum: General
Topic: Access to the LE3 data set
Replies: 2
Views: 38131

Re: Access to the LE3 data set

Hi Youngjun, It depends on how much of the data you would like - the entitre databse is approximately 1.5TB, and if you send me a hard drive I can fill it and mail it back to you. If you'd like some small subset, we may be able to set up transfer via ftp or web. Please email me patrick.moriarty@nrel...
by Pat.Moriarty
Wed Nov 17, 2010 5:43 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Airfoilprep questions
Replies: 3
Views: 4406

Re: Airfoilprep questions

Hi Streamkite, There is no physical basis for picking the value of Alpha End and for most airfoils we have found a value of 30 works best. If this leads to unrealistic results for your particular airfoil, I'd recommend using the tool to find a better value via trial and error. In the TableExtrap col...
by Pat.Moriarty
Wed Nov 17, 2010 5:25 pm
Forum: Rotor Aerodynamics
Topic: Induced flow estimation in BEM
Replies: 16
Views: 10054

Re: Induced flow estimation in BEM

Marshall and Marco, Reading through your posts, I agree with everything you have said. The state with the induction factor is between 0.5 and 1 is known as the turbulent wake state, where so much momentum is extracted by the rotor that there is some reversed flow in the wake and perhaps some through...
by Pat.Moriarty
Tue Sep 23, 2008 11:38 am
Forum: AeroDyn Development
Topic: Generalized Dynamic Wake Theory and Implementation
Replies: 13
Views: 90507

GDW velocity cutoff

Hi Scott, You're welcome to do this yourself in line 5442 in AeroSubs.f90 IF (DYNINFL .AND. UBar / ConvFact <= 8.0) THEN by changing 8.0 to 9.0 or any number you prefer. This essentially forces it to run in BEM mode, which you are doing manually now. So it may be easier to just do it manually if you...
by Pat.Moriarty
Tue Sep 02, 2008 4:34 pm
Forum: Computer-Aided Engineering Software Tools
Topic: FAST question about noise
Replies: 1
Views: 1882

FAST Noise module

Stefano, The code uses an empirical relationship developed by Brooks, Pope, and Marcolini (1989) to produce the amplitudes of noise levels in third octave bands, but doesn't directly calculate the sound waves. So, the calculation is independent of the time step used in the simulation. cheers, Pat
by Pat.Moriarty
Mon Feb 11, 2008 12:25 pm
Forum: Airfoils
Topic: the vitrna's model
Replies: 1
Views: 37872

Hi M. The Viterna method is at least partially explained in the AeroDyn theory manual - http://wind/designcodes/simulators/aerodyn/AD_Theory.pdf The rule of thumb is not firm, but depends on what data you have available. If you have data available above stall, you may want to use all the data you ha...
by Pat.Moriarty
Fri Jun 08, 2007 9:13 am
Forum: General
Topic: Estimation of extreme 10 minute average wind speed
Replies: 1
Views: 24120

Extreme distribution

Claudio,

The asymptotically correct distribution for wind maxima is the Gumbel (sometimes referred to as the type I GEV), although you should always check the goodness of the fit against the data before extrapolating, another distribution may prove to be better.

-Pat
by Pat.Moriarty
Thu May 17, 2007 11:08 am
Forum: Computer-Aided Engineering Software Tools
Topic: To MatLab, or not to MatLab
Replies: 10
Views: 12264

Matlab

In post-processing my data in Crunch, I've often come across memory issues so I'm not sure that writing it in Matlab will improve things. Also, in order to get people to use our codes, having a DOS executable is preferable than requiring people to get a Matlab license (although there is that open so...
by Pat.Moriarty
Mon Jan 29, 2007 11:09 am
Forum: Rotor Aerodynamics
Topic: Re variation over span
Replies: 9
Views: 14842

Rieuk

I'd start here... Simms, D. A.; Fingersh, L. J.; Butterfield, C. P. (1995). NREL Unsteady Aerodynamics Experiment Phase III Test Objectives and Preliminary Results. Musial, W. D.; Hock, S. M.; Berg, D. E., eds. Wind Energy 1995: Proceedings of the Energy and Environmental Expo '95, the Energy-Source...
by Pat.Moriarty
Fri Jan 26, 2007 4:37 pm
Forum: Rotor Aerodynamics
Topic: Re variation over span
Replies: 9
Views: 14842

Multi-Re airfoil data

Rieuk, I looks like you have two separate issues - the effect of turbulence and the effect of Reynolds number. Your Reynolds number range is in the transition region for many airfoils and likely for the NACA 4421 as well. This means that there will likely be variation in lift and drag with Re. Howev...
by Pat.Moriarty
Tue Jan 23, 2007 12:03 pm
Forum: Airfoils
Topic: Airfoilprep extrapolation of CM
Replies: 8
Views: 13915

AirfoilPrep CMs

Hi Claudio, I think that the large jump you are seeing between the low values and high values at the angles is not physical. This is highly dependent on the airfoil shape, but for a smoothly varying airfoil (not a lot of camber) I would expect that Cm would also smoothly vary. As Marshall suggests I...
by Pat.Moriarty
Mon Jan 22, 2007 4:46 pm
Forum: Airfoils
Topic: Airfoilprep extrapolation of CM
Replies: 8
Views: 13915

AirfoilPrep CMs

Hi Claudio, Your correct, these numbers are a little suspect. The explanation of where these come from can be found in Appendix D of the AeroDyn User's manual (AirfoilPrep used to be known as FoilCheck, just to make things even more confusing) http://wind/designcodes/simulators/aerodyn/AeroDyn.pdf I...
by Pat.Moriarty
Tue Apr 18, 2006 2:04 pm
Forum: Airfoils
Topic: equation of the medium chord SG6040
Replies: 1
Views: 8445

Airfoils coords

You can find it here, along with many other airfoils...

http://www.ae.uiuc.edu/m-selig/ads/coord_database.html

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