Search found 12 matches

by Rebecca.Sykes
Tue Jan 22, 2013 9:25 am
Forum: Structural Analysis
Topic: Tower Eigenfrequencies of NREL 5MW Turbine
Replies: 60
Views: 56247

Re: Tower Eigenfrequencies of NREL 5MW Turbine

Thanks for your reply Jason. You made me question myself but I downloaded a new copy of the DC version from the website http://wind.nrel.gov/designcodes/preprocessors/bmodes/ to be sure. The additional supports section including draft etc. is included in the design codes website version. Line 590 on...
by Rebecca.Sykes
Fri Jan 18, 2013 7:51 am
Forum: Structural Analysis
Topic: Tower Eigenfrequencies of NREL 5MW Turbine
Replies: 60
Views: 56247

Re: Tower Eigenfrequencies of NREL 5MW Turbine

Jason, Can you tell me what the difference between BModes hosted on your site at http://wind.nrel.gov/public/jjonkman/BModes/ (JJ) and on the design codes website http://wind.nrel.gov/designcodes/ (DC) is. Having looked at the source code for the design codes website and testing that hosted on JJ, i...
by Rebecca.Sykes
Thu Nov 29, 2012 11:18 am
Forum: Computer-Aided Engineering Software Tools
Topic: User defined shear profile
Replies: 3
Views: 2222

User defined shear profile

Hi, I have been working on incorporating user defined shear exponents in IECWIND and have found that turbsim already has this capability. It appears from the turbsim code that there is also the means to have a USR (user) defined shear profile type, which has a file read-in in the GetUSR subroutine. ...
by Rebecca.Sykes
Tue Sep 18, 2012 9:58 am
Forum: Computer-Aided Engineering Software Tools
Topic: IECWind EWS
Replies: 4
Views: 3604

Re: IECWind EWS

Thanks for the update Marshall :)

Its good to feedback into the software, to improve as well as use.
by Rebecca.Sykes
Thu Sep 13, 2012 6:40 am
Forum: Computer-Aided Engineering Software Tools
Topic: IECWind EWS
Replies: 4
Views: 3604

Re: IECWind EWS

HI Marshall, Thank you for your reply. I agree alpha is certainly different for 61400-3 to 61400-1. It is 0.14 rather than 0.2, and you are correct, it is outlined at the top of p22 in my copy of 61400-3 also. However what I am querying is the interpretation of the expression for EWS in 61400-1 p30 ...
by Rebecca.Sykes
Tue Sep 11, 2012 10:45 am
Forum: Computer-Aided Engineering Software Tools
Topic: IECWind EWS
Replies: 4
Views: 3604

IECWind EWS

Hi All - though I think this may be in Marshall's domain... Marshall, This is partly a question about IEC Wind and partly a question of standards. The GenEWS routine has a commented out value of alpha which was used in the determination of v(z,t) via ShrMax; now the params value of alpha is used, wh...
by Rebecca.Sykes
Fri Jul 27, 2012 9:55 am
Forum: Computer-Aided Engineering Software Tools
Topic: TurbSim memory requirements
Replies: 5
Views: 3048

Re: TurbSim memory requirements

The simulation completed at approximately 9 hours simulation time which seems rather extended. Perhaps it would be possible to speed up the generation of wind files, using a computer with sufficient memory, by storing all the data arrays simultaneously in memory without reading or writing from the f...
by Rebecca.Sykes
Thu Jul 26, 2012 11:38 am
Forum: Computer-Aided Engineering Software Tools
Topic: TurbSim memory requirements
Replies: 5
Views: 3048

Re: TurbSim memory requirements

Hi! Thanks for your quick replies Marshall and Bonnie. I am running the 64bit version with the same input file (3GHz 16Gb RAM) and so far (8 or so hours) it has not completed the simulation. Marshall, could you expand upon this... Future versions of TurbSim and InflowWind (used by FAST) will cycle t...
by Rebecca.Sykes
Wed Jul 25, 2012 5:12 am
Forum: Computer-Aided Engineering Software Tools
Topic: TurbSim memory requirements
Replies: 5
Views: 3048

TurbSim memory requirements

Hello, I am trying to create a 1 hour wind file using TurbSim with the following input file and am getting an error allocating 1396MB for the velocity array. Is this related to the allocation in the fortran code or the limits of a windows 32bit system with 3.16GB RAM? TurbSim managed a 30minute simu...
by Rebecca.Sykes
Mon Jul 09, 2012 12:08 pm
Forum: Structural Analysis
Topic: Tower Eigenfrequencies of NREL 5MW Turbine
Replies: 60
Views: 56247

Re: Tower Eigenfrequencies of NREL 5MW Turbine

I have been working on simulating the NREL 5MW turbine using the foundation models for IEA-ANNEX XXIII subtask 3. I have been attempting to recreate the natural frequencies which were reported in the document OC3-Soil-Pile-Interaction Models_ReadMe.pdf with the coupled springs but have been unable t...
by Rebecca.Sykes
Mon Jun 25, 2012 11:11 am
Forum: Computer-Aided Engineering Software Tools
Topic: Instructions for Compiling FAST
Replies: 246
Views: 128630

Re: Instructions for Compiling FAST

Hi Bonnie, To speed up batch processing I would like to have multiple FAST runs simultaneously on the same computer which has multiple cores. Are there any concerns associated with the storing of variables? Also what are the implications of the required compiler settings specified in your report: Be...
by Rebecca.Sykes
Tue Feb 07, 2012 2:25 am
Forum: Computer-Aided Engineering Software Tools
Topic: WAMIT origin and HydroDyn
Replies: 1
Views: 1403

WAMIT origin and HydroDyn

Can anyone confirm my understanding that the origin used in WAMIT to obtain the hydrodynamic coefficients should be the same location specified as the PtfmRef value in HydroDyn. And hence this is also the location at/about which the output parameters PtfmFxt etc. are defined.

Many thanks
Rebecca

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