Rigid Turbine - NREL5MW

[teocar]

Hello,
I would like to use the BEM method for a rigid wind turbine without structural deflections and active control systems. While reviewing topics in the Q&A section, I came across the "stand-alone AeroDyn" application, which requires compilers to be set up in Fortran if we want to use it. Unfortunately, I am not familiar with Fortran, and I would like to know if there are other applications you could recommend for a rigid turbine BEM simulation (without structural deflection and control systems). Is there an alternative to "stand-alone AeroDyn," or is it possible to create a rigid turbine within FAST? If there is such an example in Fast, can you share it?

I came across the CCBlade application, but I am not sure if it can meet my requirements, and I think I need an expert opinion on this.

Thank you for your time. Best regards.

[jjonkman]

Dear @teocar,

Regarding AeroDyn, some releases of OpenFAST, including the newest v3.5.4, include a precompiled Windows executable of the standalone AeroDyn driver, so, a Fortran compiler may not be needed. Regardless, Fortran compilers and freely available and NREL has provided the scripts needed to compile the standalone AeroDyn driver, as documented here: https://openfast.readthedocs.io/en/main/source/install/index.html.

You can also run rigid wind turbine simulations within OpenFAST, but this will not be as efficient and will be harder to set-up than the standalone AeroDyn driver. To model a fully rigid wind turbine in OpenFAST, disable ServoDyn, BeamDyn, SubDyn, as well as all structural degrees of freedom within ElastoDyn.

CCBlade is a simplified model compared to the standalone AeroDyn driver. If steady aerodynamic-only performance under uniform inflow is what you are after, the standalone AeroDyn driver and CCBlade should yield similar results, but the standard AeroDyn driver is better for skewed inflow, turbulence, and transient events.

Best regards,

[teocar]

Dear @jjonkman ;

As you mentioned, the Aerodyn driver has been helpful, and I am grateful for that. Additionally, I am comparing my results with the literature, particularly with some BEM and CFD solutions that I have found in articles so far. Is there any report available where I can compare my results?

Thank you for your support.

Burmester at all: https://iopscience.iop.org/article/10.1088/1742-6596/753/8/082003/pdf
Pinto at all https://doi.org/10.1007/s40722-020-00162-y
H.Martin at all https://doi.org/10.1115/OMAE2012-83627

Kim at all https://doi.org/10.1016/j.renene.2012.08.029

[teocar]

Dear @jjonkman ,

Thanks for reply,
I would like to conduct a fatigue analysis on the NREL 5MW blade and have come across a couple of approaches. One involves using NuMAD to export a shell file compatible with ANSYS APDL, and another involves using MLife.

Do you know if there is any data in NuMAD for the NREL 5MW turbine, or if a CAD model with the material specifications for the 5MW turbine is available? I have extensively searched the forums but couldn’t find a conclusive result.

I would greatly appreciate your assistance on this matter.
Thank you in advance.

[jjonkman]

Dear @teocar,

Brian Resor of Sandia National Laboratory reversed-engineering the composite layup and internal structural details for the blade of the NREL 5-MW baseline wind turbine. See the following forum post for more information: https://forums.nrel.gov/t/structural-design-of-the-wind-turbine-blade/271.

Best regards,

[teocar]

Dear @jjonkman,

Yes, I have reviewed this page, but unfortunately, I cannot access the links shared under the forum topic. Would it be possible for you to share a copy with me if available?
[email protected]

Best Regards.

[jjonkman]

Dear @teocar,

I’ve sent you the files via e-mail.

Best regards,

[teocar]

Dear @jjonkman ,
The mail has arrived. I am grateful for the mail.
Best Regards.

[teocar]

Dear @jjonkman;

Is there a forum that can help me with the problem I encountered with Numad or should I open it here again under a different tag?

[jjonkman]

I would suggest posting your NuMAD-related questions on our forum: https://forums.nrel.gov/. I'm not aware of a separate forum dedicated to NuMAD or other Sandia National Laboratory wind software.

[BAbaka626]

Dear @jjonkman

I am currently conducting simulations of wind farms arranged in series. When the wind turbines are configured as "Semi Semi Fixed" or "Spar Semi Semi," the power generation of the two downstream turbines shows negative values. In contrast, configurations such as "Semi Fixed Fixed" and "Spar Spar Fixed" yield positive power generation values. Have you encountered this situation before? It appears that when the second turbine is a floating wind turbine, its power generation becomes negative. Below are the average power generation values and the parameter settings. Please help analyze this phenomenon.

[jjonkman]

Dear @BAbaka626,

I would not expect the power of the downstream turbines to be negative under these conditions.

I would guessing the controller of the downstream turbines is not behaving properly or there is some other problem in the response of the downstream turbines. Presumably you are using the NREL 5-MW baseline wind turbine atop various support structures such as the OC4-DeepCwind semisubmersible, OC3-Hywind spar, and OC3-monopile; is that correct? What hub-height mean wind speed are you simulating? Are you using the correct DISCON controllers for each turbine? Are you initializing the rotor speed and blade-pitch angles properly for the mean hub-height wind speed you are simulating? What are the rotor speeds and blade-pitch angles of turbines doing?

Best regards,

[BAbaka626]

***@***.*** Thank you for your reply. I will try to copy the controller of the upstream fan with normal power for the downstream fan. The fan type is correct. In this experiment, the constant wind of 11.4 is used, the rotor speed of the fan is rated at 12.1rpm, and other settings are initial, and when the Semi fan is upstream, the power will not be negative. In summary, I will copy the controller and observe the change of power generation. Best regrads

…

----------Reply to Message---------- On Wed, Jan 8, 2025 23:40 PM ***@***.***> wrote: Dear @BAbaka626, I would not expect the power of the downstream turbines to be negative under these conditions. I would guessing the controller of the downstream turbines is not behaving properly or there is some other problem in the response of the downstream turbines. Presumably you are using the NREL 5-MW baseline wind turbine atop various support structures such as the OC4-DeepCwind semisubmersible, OC3-Hywind spar, and OC3-monopile; is that correct? What hub-height mean wind speed are you simulating? Are you using the correct DISCON controllers for each turbine? Are you initializing the rotor speed and blade-pitch angles properly for the mean hub-height wind speed you are simulating? What are the rotor speeds and blade-pitch angles of turbines doing? Best regards, — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you were mentioned.Message ID: ***@***.***>