News and Updates

Materials from 20-Nov-2013 workshop available

Modeling Workshops - Mon, 11/25/2013 - 14:22
Dear Wind Turbine Modeling Enthusiast,

On November 20, 2013 I led a Wind Turbine Modeling Workshop in Frankfurt, Germany held in conjunction with EWEA Offshore. The presentations and sample simulations that were presented at this workshop are now available from: http://wind.nrel.gov/public/jjonkman/Pr ... rtGermany/. The presentations and sample simulations provide an overview of the NREL-developed CAE tools, with a focus on FAST v8.

Enjoy!

Best regards,

Statistics: Posted by Jason.Jonkman — Mon Nov 25, 2013 2:22 pm

Categories: News and Updates

First Version of FAST Under the New Framework is Available

Software Releases - Fri, 10/04/2013 - 01:21
We have recently released the first development version of FAST, and its various modules, under the new modularization framework to our website:

FAST v8.03.02b-bjj (http://wind.nrel.gov/designcodes/simulators/fast/alpha/)

Modules:
ElastoDyn v1.01.02b-bjj (included in link above)
ServoDyn v1.01.01b-bjj (included in link above)
AeroDyn v14.02.00c-mlb (http://wind.nrel.gov/designcodes/simula ... dyn/alpha/)
InflowWind v2.00.00b-adp (http://wind.nrel.gov/designcodes/simula ... ind/alpha/)
HydroDyn v2.00.10a-gjh (http://wind.nrel.gov/designcodes/simula ... ind/alpha/)
SubDyn v0.04.00a-rrd (http://wind.nrel.gov/designcodes/simulators/subdyn/)
MAP v0.87.06a-mdm (http://wind.nrel.gov/designcodes/simulators/map/)

Other Components:
NWTC Subroutine Library v2.03.00b-bjj (http://wind.nrel.gov/designcodes/miscel ... C_Library/)
FAST Registry v2.01.00 (included in link above)
SS_Fitting v1.00.01 (http://wind.nrel.gov/designcodes/prepro ... S_Fitting/)

While we are very excited about this release and the new capability it brings to FAST, please be aware that this is the initial release. As with anything new, we encourage users to take appropriate precautions. We have tested many features, but not all. Please interpret the results carefully and report back any confirmed errors to the NREL developer(s). Further development, verification, and validation work is ongoing at NREL. Check back regularly to obtain the latest version of the code.

Happy Modeling!

Statistics: Posted by Jason.Jonkman — Fri Oct 04, 2013 12:21 am

Categories: News and Updates

Modeling workshop to be held on 20-Nov-2013

Modeling Workshops - Thu, 10/03/2013 - 22:54
Dear Wind Turbine Modeling Enthusiast,

In partnership with the Endowed Chair of Wind Energy (SWE) at the University of Stuttgart and the National Renewable Energy Laboratory (NREL), a workshop on the FAST wind turbine computer-aided engineering (CAE) software tool developed by NREL will be held on November 20, 2013 in Frankfurt, Germany. More information, including a registration form, is available from: http://wind.nrel.gov/public/jjonkman/Pr ... rtGermany/.

Best regards,

Statistics: Posted by Jason.Jonkman — Thu Oct 03, 2013 9:54 pm

Categories: News and Updates

Materials from 9-Aug-2013 workshop available

Modeling Workshops - Wed, 08/14/2013 - 06:39
Dear Wind Turbine Modeling Enthusiast,

On August 9, 2013 I led a Wind Turbine Modeling Workshop at the University of Colorado in Boulder, Colorado (USA) held in conjunction with the 2013 North American Wind Energy Academy (NAWEA) Symposium. The presentations and sample simulations that were presented at this workshop are now available from: http://wind.nrel.gov/public/jjonkman/Pr ... BoulderCO/. The presentations and sample simulations provide an overview of the NREL-developed CAE tools, with a focus on the capabilities of FAST, AeroDyn, and HydroDyn.

Enjoy!

Best regards,

Statistics: Posted by Jason.Jonkman — Wed Aug 14, 2013 5:39 am

Categories: News and Updates

Modeling workshop to be held on 9-Aug-2013

Modeling Workshops - Mon, 06/24/2013 - 14:54
Dear Wind Turbine Modeling Enthusiast,

A workshop on the FAST wind turbine computer-aided engineering (CAE) tool developed by the National Renewable Energy Laboratory (NREL) will be held on August 9 at the University of Colorado Boulder. This workshop is being held in conjunction with the 2013 North American Wind Energy Academy (NAWEA) Symposium taking place August 6-8.

To attend the FAST workshop, you must register for the NAWEA Symposium and indicate your desire to attend the workshop on the registration form. Please note that the FAST workshop will be limited to the first 50 registrants. More information, including a registration form, is available here: http://www.nawea.org/2013-symposium/.

Best regards,

Statistics: Posted by Jason.Jonkman — Mon Jun 24, 2013 1:54 pm

Categories: News and Updates

Materials from 17-April-2013 workshop available

Modeling Workshops - Wed, 04/24/2013 - 10:52
Dear Wind Turbine Modeling Enthusiast,

On April 17, 2013 I led a Wind Turbine Modeling Workshop at JEMA in Tokyo, Japan. The presentations and sample simulations that were presented at this workshop are now available from: http://wind.nrel.gov/public/jjonkman/Pr ... okyoJapan/. The presentations and sample simulations provide an overview of the NREL-developed CAE tools, with a focus on the capabilities of FAST, AeroDyn, and HydroDyn.

Enjoy!

Best regards,

Statistics: Posted by Jason.Jonkman — Wed Apr 24, 2013 9:52 am

Categories: News and Updates

Modeling workshop to be held on 17-April-2013

Modeling Workshops - Thu, 03/07/2013 - 13:53
Dear Wind Turbine Modeling Enthusiast,

In conjunction with the Wind Energy Institute of Tokyo, the Japan Electrical Manufacturer’s Association (JEMA), and the National Renewable Energy Laboratory (NREL), a workshop on the FAST wind turbine computer-aided engineering (CAE) tool developed by the NREL will be held on April 17, 2013 at the JEMA headquarters in Tokyo, Japan. More information, including a registration form, is available from here:

http://www.jema-net.or.jp/Japanese/info ... 30417.html (in Japanese)
http://translate.google.com/translate?s ... 30417.html (in English)

Best regards,

Statistics: Posted by Jason.Jonkman — Thu Mar 07, 2013 1:53 pm

Categories: News and Updates

New versions of FAST, A2AD, and AeroDyn are available

Software Releases - Mon, 02/25/2013 - 10:48
We have recently uploaded new versions of several of our NWTC CAE tools to our Web site:

FAST v7.02.00d-bjj (http://wind.nrel.gov/designcodes/simulators/fast/),
ADAMS2AD (A2AD) v13.01.00b-bjj (http://wind.nrel.gov/designcodes/simulators/adams2ad/),
AeroDyn v13.00.02a-bjj (http://wind.nrel.gov/designcodes/simulators/aerodyn/), and


Some of the most notable changes include:
  • A new option for creating FAST binary output files has been added. You will have to modify your primary FAST input files.
  • The FAST archive now contains a "Labview" folder. This folder contains a DLL that has been designed to run FAST in LabVIEW Real-Time 2012 SP1. We assume anyone who uses this DLL is proficient with using LabVIEW software.
  • FAST, A2AD, and AeroDyn have been updated to compile with NWTC Subroutine Library v1.07.00.
  • The InflowWind module has been removed from AeroDyn and is now a separately distributed archive.
  • We have fixed the minor bugs from FAST v7.01.00 that were reported on the forum.
  • We added a makefile to compile FAST with gfortran 4.6.2. (The executable code generated by this makefile runs approximately four times slower than the code generated by IVF 12.1.)
For a full list of changes included in these codes, please see the "ChangeLog.txt" files in their respective archives.
Changes to these tools should result in only negligible (if any) differences with previous simulation results.

Because we have not had the time to update these code's respective user's guides, we have left them as alpha versions. We have, however, documented the changes in the updated Addendum to the User's Guides. We encourage you to read it.

Please note that these updated tools are NOT in the new FAST modularization framework. Progress on converting to the new framework is taking place, and we anticipate releasing the first versions of these tools in the framework in the coming months. Because the process of converting all of the current features of the CAE tools will take some time, we plan to make FAST v7.02.00 available concurrently with FAST 8.* (the version in the new framework).

Please use our forums to leave questions or comments.

Happy Modeling!

Statistics: Posted by Bonnie.Jonkman — Mon Feb 25, 2013 10:48 am

Categories: News and Updates

Announcing minor update to Crunch (v3.02.00b-mlb)

Software Releases - Fri, 01/18/2013 - 15:49
Hi,

I made some minor changes to fix bugs related to user interaction (no computations changed) and cleaned up the code some. I also created a new Python-based regression test to replace CertTest.bat. The new test will run on virtually any operating system that supports a Python interpreter.

Here are the additions to the change log:

Code:
v3.02.00a-mlb, 10-Jan-2013,  M. Buhl
o  I created Crunch_RegTest.py so we could have a system-independent certification test.  I removed
   CertTest.bat and associated files from the archive and Subversion.
o  I made a few mods to the .cru files and the python regression test to make them Linux compatible.
o  I removed the logic for testing the validity of RealFmt in Crunch_IO.f90\GetParams() and put it
   in ChkRealFmtStr in the Library's NWTC_IO.f90\ChkRealFmtStr().
o  I modified Crunch_IO to allow one to enter 0 for NumInCols and NumCols when using FAST binary
   files and use the information in the binary files to provide the column information.
o  I eliminated a bug that occurred when TEnd was zero.

v3.02.00b-mlb, 18-Jan-2013,  M. Buhl
o  I added error handling for having no readable input files or asking for the time in the
   peak/valley listing if no time column was specified.

You can download this latest version of Crunch here: http://wind.nrel.gov/designcodes/postprocessors/crunch

Enjoy!


Marshall

Statistics: Posted by Marshall.Buhl — Fri Jan 18, 2013 3:49 pm

Categories: News and Updates

Updated Crunch Postprocessor (v3.01.00d-mlb, 18-Dec-2012)

Software Releases - Wed, 12/19/2012 - 16:47
Hi,

I've uploaded the latest alpha version of Crunch. Some of the changes are:

  • I added the ability to read the new FAST binary files in preparation for a future release of FAST.
  • I fixed a bug related to limiting what records are read based upon time.
  • I made changes to modernize the code and to get it to work with the latest version (not released yet) of the NWTC Library.
  • I increased the string length for path and file names to 1024 characters.
  • I fixed peak listing so time did not have to be in column 1.
  • I changed it so there is no longer a default input file and added a pause when it is left off the command line for all you who try to run the program by double-clicking on the executable in Windows Explorer.
  • I created a makefile for people using the gfortran compiler and fixed some bugs that showed up with that compiler.
  • I now supply both 32-bit and 64-bit Windows executables.
  • The web site now allows downloading a tar.gz archive of the software.
In general, we have switched to MATLAB-based postprocessors, but Crunch has some features we needed for a project here that MCrunch does not have and we needed it to read the new binary files. To be honest, I prefer Crunch to MCrunch because of the speed and I am a much better Fortran programmer than a MATLAB programmer. The advantage of MATLAB is the plotting capability and the ability to generate Excel spreadsheets.

I hope to upload the latest version of the NWTC Library this week in case there are people who want to use this on Linux.

Statistics: Posted by Marshall.Buhl — Wed Dec 19, 2012 4:47 pm

Categories: News and Updates

Updated version of WT_Perf (v3.05.00a-adp)

Software Releases - Mon, 11/12/2012 - 12:43
We are happy to announce a new release of WT_Perf (v3.05.00a-adp), a wind turbine perfomance evaluator based on using BEM theory.

New features and changes included in this release:

- Modification of the solver for better convergence
- Improved control of the solver through the addition of the NSplit parameter in the input file
- Included a makefile for compilation on Linux systems with gfortran (requires gcc 4.6 and later and the NWTC Library v1.05.00 and later)
- New flag in the output .oup and .bed files to indicate full convergence
- The OutNines input parameter has been replaced with ConvFlag for controlling how non-convergent cases are reported. This has options of:
  • 0 -> for reporting the calculated values as is (old OutNines=false behaviour)
  • 1 -> to report "9's" in place of non-converged values (old OutNines = true behaviour)
  • 2 -> to report NaN in place of non-converged values.
- Revised counting of cases that fail to fully converge
- Newly revised and updated users guide
- Removed the DAWT feature since that was never fully implimented
- Numerous bug fixes

This latest version of the software and documention is available for download on the WT_Perf webpage:

http://wind.nrel.gov/designcodes/simulators/WTPerf

You can post your comments in the Computer-Aided Engineering Software Tools forum or email them to Andrew Platt (andrew.platt@nrel.gov) or Marshall Buhl (marshall.buhl@nrel.gov).

Happy modeling,
Andy

Statistics: Posted by Andy.Platt — Mon Nov 12, 2012 12:43 pm

Categories: News and Updates

Updated version of MLife software (v1.00.00f-gjh)

Software Releases - Mon, 10/22/2012 - 13:05
We are happy to announce an updated alpha-version release of MLife (v1.00.00f-gjh), a MatLab-based tool that can efficiently process statistical and fatigue-related output needed for wind turbine certification. MLife's calculations follow the method required by the IEC in their 61400-1 Edition 3, Annex G, design standard, and the recommendations of Germanischer Lloyd (GL) in their Guideline for Certification of Wind Turbines, 2010 edition.

New functionality of this release includes:

- Use of Design Load Cases (DLCs)
- Use of Partial Safety Factors (PSFs)
- Fatigue calculations with and without using the Goodman correction
- Short-term aggregate calculations
- Short-term damage-rate calculations
- Support for binary FAST output files
- Faster rainflow counting using a MEX-file (requires installation of Visual Studio 2010 SP1 run-time libraries, which are included in the distribution archive)
- New wind speed binning scheme
- Use of turbine availability factor
- Many bug fixes
- Updated settings file format to accommodate the new features (this version is NOT backwards compatible with previous MLife releases)
- updated user and theory manuals

The input data for MLife are typically obtained from a large series of aero-elastic simulations (FAST, for example). The software functionality of version 1.0 -- including calculations of general statistics, lifetime damage, and damage-equivalent loads -- has been implemented and the project is now focused on verification and validation of the tool.

Engineers at the National Wind Technology Center (NWTC) at the National Renewable Energy Laboratory had created a program called MCrunch that included these features and many more, but MCrunch must store the entire dataset concurrently in memory. For such a large number of simulations, the memory requirements would exceed the amount available in an engineer's typical computer. Staff at the NWTC recently addressed this problem by creating MExtremes for the extreme-event tables and MLife for fatigue-life predictions. These specialized tools process files sequentially, so only one data file is stored in memory at a time.

Feel free to download the software and associated documentation from the MLife webpage:

http://wind.nrel.gov/designcodes/postprocessors/MLife

Feedback during alpha testing will be used to identify any problems which prevent analysis and results generation in accordance to the IEC and GL recommendations mentioned previously.

You can post your comments in the Computer-Aided Engineering Software Tools forum or email them to Greg Hayman, greg.hayman@nrel.gov.

Kindest Regards,

Greg Hayman
NREL subcontractor
greg.hayman@nrel.gov

Statistics: Posted by Greg.Hayman — Mon Oct 22, 2012 12:05 pm

Categories: News and Updates

Materials from 8-Oct-2012 workshop available

Modeling Workshops - Fri, 10/12/2012 - 14:04
Dear Wind Turbine Modeling Enthusiast,

On October 8, 2012, we held an NREL/DOE Workshop on the new modularization framework for the FAST wind turbine CAE tool. The presentations given at the workshop are now available from: http://wind.nrel.gov/public/jjonkman/Pr ... iaBeachVA/.

Enjoy!

Best regards,

Statistics: Posted by Jason.Jonkman — Fri Oct 12, 2012 1:04 pm

Categories: News and Updates

Workshop for FAST developers to be held 8-Oct-2012

Modeling Workshops - Fri, 08/24/2012 - 22:31
Dear Wind Turbine Modeling Enthusiast,

The National Renewable Energy Laboratory (NREL) in conjunction with the U.S. Department of Energy (DOE) Wind and Water Power Program will be hosting a workshop on the new modularization framework for the FAST wind turbine computer-aided engineering (CAE) tool. This workshop is specifically targeted at participants of the projects funded through DE-FOA-0000415 who are developing new offshore-related features for FAST, but other users of FAST who contribute (or are planning to contribute) to its development are encouraged to attend. This half-day workshop is free and will be held in conjunction with the AWEA OFFSHORE WINDPOWER Conference & Exhibition in Virginia Beach, VA (USA) on October 8, 2012.

More information, including the workshop invitation, agenda, and registration form are attached. Registration will be limited to approximately 50 people, and preference will first be given to DE-FOA-0000415 project participants. We will open up a net-meeting for those who cannot attend in person. Those interested in attending (either in person or by net-meeting) should submit their registration form by September 21.

Best regards,

Statistics: Posted by Jason.Jonkman — Fri Aug 24, 2012 9:31 pm

Categories: News and Updates

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