########### Description ###########
The data in this directory is intended to serve as an input for others dealing with unsteady boundary-layer transition and has been discussed in the following papers:

EXIF paper (thorough discussion of Test Case V, Test Case II is also included but not focused on):
Weiss, A.; Wolf, C.C.; Kaufmann, K.; Braukmann, J.N.; Heineck, J.T. & Raffel,M. "Unsteady boundary-layer transition measurements and computations on a rotating blade under cyclic pitch conditions", Experiments in Fluids (2020)61:61, available under https://doi.org/10.1007/s00348-020-2899-7

ODAS paper (thorough discussion of Test Case II)
Weiss, A.; Braukmann, J.N.; Kaufmann, K. "EXPERIMENTAL AND NUMERICAL INVESTIGATIONS OF UNSTEADY BOUNDARY-LAYER TRANSITION ON A DYNAMICALLY PITCHING SUBSCALE HELICOPTER ROTOR BLADE", 19th ONERA-DLR Aerospace Symposium, Meudon, France, June 3-5, 2019, available under https://elib.dlr.de/127485/1/ELIB-Eintrag-2019-WeissA-127485-Paper.pdf

########### Content for both Test Cases ########### 
RTG_blades_without_roots.igs
- CAD geometry of rotor blade not including the rotor root part (blade only), which can be used for computational grid construction
- The “theta_0, deg” parameter in the "boundary_conditions_TestCase_?.txt" files is the value to adjust the provided geometry with and states the installed angle of incidence with respect to the rotor plane

########### Content Test Case V ###########
boundary_conditions_TestCase_V.txt
- Ascii file containing test conditions for the data set presented (TestCase V, see in paper)

DIT_results_TestCase_V.dat
- Ascii file with experimental results presented in Fig. 17 of the publication
- data structure is explained in file, explanations are commented using #

Transmap_DIT_TestCase_V.png
- Figure showing the data contained in DIT_results_TestCase_V.dat and essentially being the left part of Fig. 17 in the publication

TAU_results_TestCase_V.dat
- Ascii file with numerical results presented in Fig. 17 of the publication
- data structure is explained in file, explanations are commented using #

Transmap_TAU_onset_plus_Delta50pc_TestCase_V.png
- Figure showing the data contained in TAU_results_TestCase_V.dat and essentially being the right part of Fig. 17 in the publication

########### Content Test Case II ###########
boundary_conditions_TestCase_II.txt
- Ascii file containing test conditions for the data set presented (TestCase II, see in both, EXIF and ODAS paper)

DIT_results_TestCase_II.dat
- Ascii file with experimental results presented in Fig. 12 of the ODAS paper
- data structure is explained in file, explanations are commented using #

Transmap_DIT_TestCase_II.png
- Figure showing the data contained in DIT_results_TestCase_II.dat and essentially being the left part of Fig. 12 in the ODAS paper

TAU_results_TestCase_II.dat
- Ascii file with numerical results presented in Fig. 12 of the ODAS paper
- data structure is explained in file, explanations are commented using #

Transmap_TAU_onset_TestCase_II.png
- Figure showing the data contained in TAU_results_TestCase_II.dat and essentially being the right part of Fig. 12 in the ODAS paper

Transmap_TAU_onset_plus_Delta50pc_TestCase_II.png
- Figure showing the data contained in TAU_results_TestCase_II.dat and being corrected by the intermittency function Delta50percent as described in the EXIF paper, the correction was not yet available in the the ODAS paper.

############### Note on setting the correct pitch angle ###############
The xy-plane in the .igs file of the blade geometry corresponds to the plane of rotation.
The blade geometry in the .igs file is provided in the setting theta_0 = 0 deg.
The angle of incidence of the first section at r=0.16 m (r/R = 0.25) is inclined by -2/3 deg with respect to the xy-plane.
The twist between r = 0.16 m (r/R = 0.25) and r = 0.65 m (r/R=1) corresponds to 9.33 deg.
In order to apply the correct pitch setting, the blade needs to be twisted with respect to the xy-plane in the .igs file by the respective pitch angle.

########## Legal statement #############
Except where otherwise noted, this item's license is described as Creative Commons Attribution 4.0, see http://creativecommons.org/licenses/by/4.0/

According to the license the material can be used under the following terms:
Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. 

Whenever the material is used in any way the original authors of the publication, i.e. the copyright holders and the original publication in Experiments in Fluids, available under https://doi.org/10.1007/s00348-020-2899-7, or the original publication at the ODAS Symposium, available under https://elib.dlr.de/127485/1/ELIB-Eintrag-2019-WeissA-127485-Paper.pdf, need to be mentioned.