Search found 14 matches

by Feizbakhshi.Morteza
Tue Sep 15, 2015 6:13 am
Forum: Computer-Aided Engineering Software Tools
Topic: Consistency between Bmodes and MBC
Replies: 5
Views: 7734

Re: Consistency between Bmodes and MBC

Thank you so much for your helpful respond I am trying your first method of using FAST linearization in order to calculate BModes input parameters. I set the CalcStdy to False, all the DOFs except the platforms to False and change the TMassDen into a very small value (not zero). The "fast_inp.l...
by Feizbakhshi.Morteza
Sun Sep 13, 2015 11:25 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Consistency between Bmodes and MBC
Replies: 5
Views: 7734

Consistency between Bmodes and MBC

Hi everyone, I extracted Bmodes input file from an assumed tower geometry. By running Bmodes the first natural frequency of the tower resulted 0.365. Then, I built the tower FAST input file to run linearization mode of FAST and MBC. First, I disabled all the DOFs except the tower 4 DOFs to examine t...
by Feizbakhshi.Morteza
Wed Feb 18, 2015 1:39 am
Forum: Computer-Aided Engineering Software Tools
Topic: SOWFA Support
Replies: 52
Views: 48816

Make inflow data to use in windPlantSolver in SOWFA

Hi I am working SOWFA and I run precursorABL successfully. after running precursorABL Solver up to quasi equilibrium condition, I run that for extra 2000 sec to get inflow data needed for windPlant Solver. Now I want to take them to windPlant Solver. I read in this forum that in this step, I should ...
by Feizbakhshi.Morteza
Fri Dec 05, 2014 10:32 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Define tower properties
Replies: 3
Views: 2629

Re: Define tower properties

Thank you so much for your answer and support

It helped a lot, but I hope that the linear interpolation is applicable in fast version 7 and BModes too.

Best regards,
by Feizbakhshi.Morteza
Wed Dec 03, 2014 3:32 am
Forum: Computer-Aided Engineering Software Tools
Topic: Define tower properties
Replies: 3
Views: 2629

Define tower properties

Hi everyone, FAST uses two text files in order to acquire blade and tower properties. Both of them use fractional length as HtFract and BlFract which must be varied from 0 to 1. My question is regarding how to specify these sections. Here, it is an example of how specifying a tower segments in two w...
by Feizbakhshi.Morteza
Tue Nov 18, 2014 5:09 am
Forum: Computer-Aided Engineering Software Tools
Topic: Replacement for RunNTM?
Replies: 14
Views: 3086

Re: Replacement for RunNTM?

The FAST version is (v7.01.00a-bjj, 16-Feb-2012). I compiled the FAST by using 64-bit system, "Compile_FAST.bat" file (IVF_LOC=C:\Program Files (x86)\Intel\ComposerXE-2011\bin\ia32) and "Intel Parallel Studio XE2011" program. The interesting thing is that the differences is just ...
by Feizbakhshi.Morteza
Sun Nov 16, 2014 11:06 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Replacement for RunNTM?
Replies: 14
Views: 3086

Re: Replacement for RunNTM?

Anyone could help?

Even it's not related to the perl. By repeating a single fast run twice without closing command prompt, the results are different. Considering that this situation is just for large wind files like turbulent (NTM: normal turbulent model).
by Feizbakhshi.Morteza
Tue Nov 11, 2014 3:55 am
Forum: Computer-Aided Engineering Software Tools
Topic: Replacement for RunNTM?
Replies: 14
Views: 3086

Re: Replacement for RunNTM?

No, please forget about the error, because it causes misunderstandings. I have a perl script that runs completely and I readjust the perl in order to run just one load case to compare the perl and method. Exactly I run the same input file and the same FAST executable in the same directory, once by c...
by Feizbakhshi.Morteza
Sun Nov 09, 2014 6:43 am
Forum: Computer-Aided Engineering Software Tools
Topic: Replacement for RunNTM?
Replies: 14
Views: 3086

Re: Replacement for RunNTM?

Hi I am using Perl script too, for running FAST. I am not sure how correct my perl code is but it seems work well. I checked the parameters and all of them replaced the original parameters in FAST_inp.fst file. But the problem I encountered is that the result of simulation by using perl script is di...
by Feizbakhshi.Morteza
Wed Oct 29, 2014 12:09 am
Forum: Computer-Aided Engineering Software Tools
Topic: Compiling in double precision
Replies: 3
Views: 2112

Re: Compiling in double precision

Thanks a lot dear Jonkman I did the compile with double precision and it didn't solve my problem. Instead by reducing the time step from 0.0125 to 0.0025 and single precision, the error has gone. In past, DecFact was 10 (output every time step), now by reducing time step to 0.0025, is it necessary t...
by Feizbakhshi.Morteza
Tue Oct 28, 2014 6:29 am
Forum: Computer-Aided Engineering Software Tools
Topic: Compiling in double precision
Replies: 3
Views: 2112

Compiling in double precision

Hi, I have a problem with running FAST which is as below: WARNING: High VNB velocity encountered during induction factor calculation. Blade number 1, Element number 25 VNW = 17.794, VNB = -101.75 WARNING: Small angle assumption violated in SUBROUTINE SmllRotTrans() due to a large platform displaceme...
by Feizbakhshi.Morteza
Wed Oct 08, 2014 6:44 am
Forum: Computer-Aided Engineering Software Tools
Topic: natural frequency of tower and blades
Replies: 2
Views: 2333

Re: natural frequency of tower and blades

Thank you so much for your response My mistake was about blade frequencies. Because in catalog the stationary frequencies have been stated. In Modes software, I change the rotational speed to zero and got a good approximation of natural frequencies(with +-5% deviation) without changing the adjustmen...
by Feizbakhshi.Morteza
Wed Oct 08, 2014 6:17 am
Forum: Computer-Aided Engineering Software Tools
Topic: Gearbox efficiency
Replies: 3
Views: 2536

Gearbox efficiency

Hi everybody I am using FAST for modelling wind turbine. In my model, gearbox efficiency is less than 100%. Then, how can I consider gearbox efficiency in VS_Rgn2K (generator constant in region 2). From documents we know that VS_Rgn2K is calculated in HSS side as below VS_Rgn2K = 0.5 * (Air_density)...
by Feizbakhshi.Morteza
Sun Sep 21, 2014 2:05 am
Forum: Computer-Aided Engineering Software Tools
Topic: natural frequency of tower and blades
Replies: 2
Views: 2333

natural frequency of tower and blades

I am using FAST to simulate wind turbine loads. My question is regarding to the natural frequencies of the flexible parts such as tower and blades. By using finite elements software like ANSYS, the calculation of natural frequency results in different amount compare to the what Modes and BModes does...

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