Instructions for the analysis of case A : Loss of seeding in the core of a tip vortex 26.10.2000 christian.kaehler@dlr.de Image A001_1.tif and A001_2.tif were recorded at the DNW-LLF in order to study experimentally the wake vortex formation behind a transport aircraft (DLR ALVAST half model) in landing configuration (U=60 m/s, main flow direction is perpendicular to the light-sheet plane). The measurement position was 1.64 m behind the wing tip and the field of view is 170 mm by 140 mm. The images were selected as strong gradients, loss of image density, and varying particle image sizes are common problems for many PIV applications in large wind tunnels. Camera characteristics: Type PCO SensiCam, see http://www.pco.de Sensor technology Progressive Scan Resolution 1280 pixel x1024 pixel. Pixel size 6.7 micrometer x 6.7 micrometer Dynamic range 12 bits (Peltier cooled) Quantum efficiency typ 40 % Full well capacity 25000 e Readout noise @ 12.5MHz 7 ... 8 e The reference analysis for this case is : :ev_IS_size_x = 32; :ev_IS_size_y = 32; :ev_IS_size_unit = "pixel"; :ev_IS_grid_distance_x = 16; :ev_IS_grid_distance_y = 16; :ev_IS_grid_distance_unit = "pixel"; :ev_origin_of_evaluation = 16, 16; :ev_origin_of_evaluation_units = "pixel"; :ev_IS_offset = 0, 0; :ev_IS_offset_units = "pixel"; The mandatory data to be provided are : Raw data : A001_team_ref_raw.nc - the raw displacement field corresponding to the highest correlation peak - the value of the highest correlation peak for all interrogation positions - the correlation values used for the sub-pixel interpolation at the following locations (see table) ; eg. 3 x 3 neighbourhood - the whole correlation plane (extra file in tecplot format!) calculated at the following locations (see table) x (pixels) y (pixels) 512 640 528 528 800 512 ----------------------------------------------------------------------------