Changes between Version 32 and Version 33 of Tutorial/CorrelationImageVelocimetryOptimisation


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Timestamp:
Feb 2, 2015, 11:44:34 AM (6 years ago)
Author:
vaillant1p
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  • Tutorial/CorrelationImageVelocimetryOptimisation

    v32 v33  
    6464
    6565== Example of an intense vortex ==
    66 With the GUI '''uvmat''' open an image in '/UVMAT_DEMO04_PIVchallenge_2001A/images' taken from PIV challenge ([http://www.pivchallenge.org/ see website]). A short description of the experimental conditions is given in the file 'readme.txt' in the folder of the images. It is said that the field of view is 170 x140 mm, so that, since the image size is 1280x1024 px, the scale is 7.4 px/cm. but there is no information about the time interval Dt.
     66With the GUI '''uvmat''' open an image in '/UVMAT_DEMO04_PIVchallenge_2001A/images' taken from PIV challenge ([http://www.pivchallenge.org/ see website]). A short description of the experimental conditions is given in the file 'readme.txt' in the folder of the images. It is said that the flow seen in the image is the vortex behind a airplane. In term of PIV features, it represents a case with poor particle seeding in the vortex core. It is said that the field of view is 170 x140 mm, so that, since the image size is 1280x1024 px, the scale is 7.4 px/cm. but there is no information about the time interval Dt.
    6767
    68 The flow is the vortex behind a wing with poor particle seeding in the core.
     68
    6969
    7070From '''uvmat''' select '''[Run/PIV]''' so the GUI '''civ_input''' pops up. With the option''' [!ImportParam]''', import the parameters from the file 'Images.ref.civ/0_XML/frame_1.xml', select the mask 'mask_1.png' for '''[CIV1]''' and ''''[CIV2]''' in 'Images.ref.mask' and '''[RUN]''' the civ calculation on 'frame_1.png' only. The result should look like the reference result 'Images.ref.civ/frame_1-2.nc'. As expected from the dark spot at the vortex centre, the core is not properly resolved in civ1. The result is improved in civ2.