Search found 17 matches

by Alvaro.Olcoz
Fri Apr 12, 2019 12:15 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Better understanding of TipClrnc and non-interference validation
Replies: 2
Views: 122

Re: Better understanding of TipClrnc and non-interference validation

Thank you, as always, for your answer and help Jason.
Best regards
by Alvaro.Olcoz
Wed Apr 10, 2019 3:10 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Better understanding of TipClrnc and non-interference validation
Replies: 2
Views: 122

Better understanding of TipClrnc and non-interference validation

Dear Jason, After understanding the physical significance of the channel Tip-tower clearance (TipClrnc) over the 360º azimuth angle, it is clear that the only interesting region for no interference validation is when the blade points down. My question is, does FAST v8 take into account the thickness...
by Alvaro.Olcoz
Fri Mar 22, 2019 1:26 pm
Forum: Computer-Aided Engineering Software Tools
Topic: From BModes output to FAST (Blade file)
Replies: 2
Views: 193

Re: From BModes output to FAST (Blade file)

Dear Jason,
Thank you very much for your rapid help one more time!
Best regards,
Alvaro
by Alvaro.Olcoz
Wed Mar 20, 2019 10:32 pm
Forum: Computer-Aided Engineering Software Tools
Topic: From BModes output to FAST (Blade file)
Replies: 2
Views: 193

From BModes output to FAST (Blade file)

Dear Jason, I am currently trying to reproduce in BModes the mode shapes available in FAST v8 CertTest of the SWRT machine in order to learn and be able to define my own baldes' in the future. As you stated in other posts, I have selected the blade sectional properties in order to obtain the uncoupl...
by Alvaro.Olcoz
Wed Mar 13, 2019 3:25 pm
Forum: Computer-Aided Engineering Software Tools
Topic: FAST theory manual
Replies: 198
Views: 21745

Re: FAST theory manual

Dear Jason,

I would be very pleased if I could have the unofficial copy of "FAST theory manual".
My e-mail is: alvaroolcoz94@gmail.com
Best regards,

Alvaro Olcoz
by Alvaro.Olcoz
Wed Mar 06, 2019 12:22 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Simple VS implementation into FAST v8
Replies: 4
Views: 348

Re: Simple VS implementation into FAST v8

Dear Jason,
Thank you very much for your help.
Very best regards
Alvaro Olcoz
by Alvaro.Olcoz
Mon Mar 04, 2019 9:17 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Simple VS implementation into FAST v8
Replies: 4
Views: 348

Re: Simple VS implementation into FAST v8

Dear Jason, Thank you again for your rapid answer. I definetely think that the VSContrl=1 will work for my implementation. Considering the region 2, I agree that I will need to set the constant value VS_Rgn2K to obtain a constant TSR and mantain Cp at its optimum value. I know that the transition re...
by Alvaro.Olcoz
Thu Feb 28, 2019 6:26 pm
Forum: Computer-Aided Engineering Software Tools
Topic: Simple VS implementation into FAST v8
Replies: 4
Views: 348

Simple VS implementation into FAST v8

Dear all, I have performed the aerodynamic design of a SSWT using the steady state BEMT equations stated in AeroDyn Theory Manual and I have then compared my own code results with WT_Perf ones obtaining a very good correlation. The turbine's power control system is VS-FP, so in the WT_Perf model inp...
by Alvaro.Olcoz
Fri Jan 18, 2019 2:01 pm
Forum: Airfoils
Topic: Viterna polar extrapolation method (alpha_s)
Replies: 6
Views: 795

Re: Viterna polar extrapolation method (alpha_s)

Dear Jason,
Thank you one more time for your response.
Best regards,
Alvaro Olcoz
by Alvaro.Olcoz
Mon Jan 14, 2019 7:04 pm
Forum: Airfoils
Topic: Viterna polar extrapolation method (alpha_s)
Replies: 6
Views: 795

Re: Viterna polar extrapolation method (alpha_s)

Dear Jason, Regarding the 3d correction for airfoil data I finally wrote an own MATLAB script in which I applied Snel et ali.'s correction model. Now I have also implemented an extrapolation to -180º +180º using the Viterna method and this has created me a doubt: Initially I only applied the 3d corr...
by Alvaro.Olcoz
Thu Dec 20, 2018 7:00 am
Forum: Rotor Aerodynamics
Topic: Cp-TSR curve in a VS-FP stall regulated small turbine
Replies: 2
Views: 545

Re: Cp-TSR curve in a VS-FP stall regulated small turbine

Dear Jason,
I would like to thank you for your always rapid and helpful replies.
Alvaro Olcoz
by Alvaro.Olcoz
Wed Dec 19, 2018 8:22 am
Forum: Rotor Aerodynamics
Topic: Cp-TSR curve in a VS-FP stall regulated small turbine
Replies: 2
Views: 545

Cp-TSR curve in a VS-FP stall regulated small turbine

Dear all, I feel a bit confused about the shape and meaning of the typical Cp-TSR curve in a turbine with the following characteristics: - 10 kW generator rated power - Fixed Pitch and Variable Speed ( range from U= 2m/s to 6 m/s) - Stall power regulation - Cut-in and cut-out velocities are 2 and 18...
by Alvaro.Olcoz
Tue Dec 04, 2018 7:49 pm
Forum: Airfoils
Topic: Viterna polar extrapolation method (alpha_s)
Replies: 6
Views: 795

Re: Viterna polar extrapolation method (alpha_s)

Dear Jason, Thank you for your rapid reply. Your help is more than welcome. I have another doubt thay you may be able to answer: I wanted to simulate in WT_Perf a rotor blade own design for which I want to apply Shen's 3D correction into the airfoil data lift coeffcients. As I have read in the forum...
by Alvaro.Olcoz
Mon Dec 03, 2018 9:19 pm
Forum: Airfoils
Topic: Viterna polar extrapolation method (alpha_s)
Replies: 6
Views: 795

Viterna polar extrapolation method (alpha_s)

Dear all, I have original S822 airfoil data (Cl,Cd)] in an aoa range of [-25,25]º (XFOIL) and I have implemented a MATLAB script to make a 360º extrapolation following the Viterna method. The method is described in the original paper that Viterna wrote in 1982 ( Theoretical and Experimental Power Fr...
by Alvaro.Olcoz
Tue Nov 20, 2018 10:30 pm
Forum: General
Topic: Variable Speed Fixed Pitch WT blade design
Replies: 3
Views: 977

Re: Variable Speed Fixed Pitch WT blade design

I answer myself, as I have found thar WT_Perf is able to perform what I want. I have just simulated my blades and got a very similar curve to those of my matlab script and QBlade.
Best regards,
Alvaro

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