Comments (3)
Good catch, probably the yaml airfoil data at 10-13% span has a bit of a reversed lift curve and then the linear interpolation between airfoils does that. I'm curious to know what Pietro finds out :)
from r-test.
hello, I looked into this and I have some thoughts:
-
BAR0 is an older iteration of the rotor designs developed within the Big Adaptive Rotor project. BAR0 evolved into BAR-USC, which is available here https://github.com/NREL/BAR_Designs
-
Both BAR0 and BAR-USC use the thick airfoil SNL-FFA-W3-500, whose coordinates are listed here https://github.com/NREL/BAR_Designs/blob/10e11353208520a052622490693099e1e5404be0/BAR_USC/BAR_USC.yaml#L520
-
The BAR-USC design is described in this journal article https://doi.org/10.5194/wes-6-1277-2021. At the time of publishing, the polars of BAR-USC were computed with XFoil
-
Later on, we used the 2D CFD solver HAMD2D, which is described in this journal article https://doi.org/10.5194/wes-7-603-2022, to recompute the polars. These new polars are the ones listed here https://github.com/NREL/BAR_Designs/blob/10e11353208520a052622490693099e1e5404be0/BAR_USC/BAR_USC.yaml#L525
-
This is not the first thick airfoil where I see funky Cl
-
The interpolation between this lift curve and the lift of the cylinder at blade root creates funkier lift curves. Here it might be best to simply turn off the unsteady airfoil aero models
-
In the RAAW project we struggled with poor performance of some of the UAMod models https://openfast.readthedocs.io/en/main/source/user/aerodyn/theory_ua.html. We ended up toggling between UAMod 3 and 4, more details available here https://doi.org/10.5194/wes-2023-166
-
NREL and UMass have just submitted a proposal for a new research project named STABLE to the Wind Energy Technologies Office of DOE. Among other things, STABLE will review, verify, and validate the various models behind the UAMod flags. @ebranlard and his students will lead this work
from r-test.
Thanks Pietro. I think an important question is how much should we trust the lift curve of these thick airfoils, and is the spanwise interpolation a decent method (most people use it even though we know it's not ideal, but often preferred to jumps of polars like in the NREL 5 MW) or should we come up with another method to avoid interpolating polars (might be hard).
from r-test.
Related Issues (20)
- OpenFAST v4.0 deprecates AD 14 HOT 1
- The dynamic library ./../5MW_Baseline/ServoData/DISCON.dll could not be loaded. HOT 3
- Is there a detail description of the wind turbine models? HOT 2
- AeroAcoustic files HOT 2
- r test download issue
- aerodyne.dat file is missing HOT 1
- Error in r-test/glue-codes/openfast/5MW_Land_ModeShapes HOT 9
- Many case folders are missing HOT 2
- issue with running MD V2 farm branch HOT 3
- invalid logical input to read SumPrint HOT 5
- Grid too small in Y direction. HOT 10
- fast on mpi HOT 6
- DISCON.dll HOT 1
- Aerodynamic calculation using AeroDyn standalone HOT 3
- FAST Error: invalid logical input when I use Turbsim file for the wind flow HOT 1
- FAST: How can I get the force and moments in an exact location of the tower? HOT 1
- TurbSim manual HOT 2
- `Tailfin_FreeYaw1DOF_PolarBased` airfoil has linear cl curve HOT 1
- SWRT tests cases with tail fin do not match FAST7 results HOT 1
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from r-test.