Comptes Rendus
Automatic dynamic mask extraction for PIV images containing an unsteady interface, bubbles, and a moving structure
Comptes Rendus. Mécanique, Volume 344 (2016) no. 7, pp. 464-478.

When performing Particle Image Velocimetry (PIV) measurements in complex fluid flows with moving interfaces and a two-phase flow, it is necessary to develop a mask to remove non-physical measurements. This is the case when studying, for example, the complex bubble sweep-down phenomenon observed in oceanographic research vessels. Indeed, in such a configuration, the presence of an unsteady free surface, of a solid–liquid interface and of bubbles in the PIV frame, leads to generate numerous laser reflections and therefore spurious velocity vectors. In this note, an image masking process is developed to successively identify the boundaries of the ship and the free surface interface. As the presence of the solid hull surface induces laser reflections, the hull edge contours are simply detected in the first PIV frame and dynamically estimated for consecutive ones. As for the unsteady surface determination, a specific process is implemented like the following: i) the edge detection of the gradient magnitude in the PIV frame, ii) the extraction of the particles by filtering high-intensity large areas related to the bubbles and/or hull reflections, iii) the extraction of the rough region containing these particles and their reflections, iv) the removal of these reflections. The unsteady surface is finally obtained with a fifth-order polynomial interpolation. The resulted free surface is successfully validated from the Fourier analysis and by visualizing selected PIV images containing numerous spurious high intensity areas. This paper demonstrates how this data analysis process leads to PIV images database without reflections and an automatic detection of both the free surface and the rigid body. An application of this new mask is finally detailed, allowing a preliminary analysis of the hydrodynamic flow.

Published online:
DOI: 10.1016/j.crme.2016.03.005
Keywords: Particle image velocimetry, Unsteady free interface, Edge detection method, Morphological analysis

David Dussol 1; Philippe Druault 1; Bachar Mallat 2; Sylvain Delacroix 2; Grégory Germain 2

1 Sorbonne Universités, UPMC Université Paris-6, CNRS, UMR 7190, Institut Jean-Le-Rond-d'Alembert, 75005 Paris, France
2 IFREMER, Marine Structures Laboratory, 150 quai Gambetta, 62321 Boulogne-sur-Mer, France
     author = {David Dussol and Philippe Druault and Bachar Mallat and Sylvain Delacroix and Gr\'egory Germain},
     title = {Automatic dynamic mask extraction for {PIV} images containing an unsteady interface, bubbles, and a moving structure},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {464--478},
     publisher = {Elsevier},
     volume = {344},
     number = {7},
     year = {2016},
     doi = {10.1016/j.crme.2016.03.005},
     language = {en},
AU  - David Dussol
AU  - Philippe Druault
AU  - Bachar Mallat
AU  - Sylvain Delacroix
AU  - Grégory Germain
TI  - Automatic dynamic mask extraction for PIV images containing an unsteady interface, bubbles, and a moving structure
JO  - Comptes Rendus. Mécanique
PY  - 2016
SP  - 464
EP  - 478
VL  - 344
IS  - 7
PB  - Elsevier
DO  - 10.1016/j.crme.2016.03.005
LA  - en
ID  - CRMECA_2016__344_7_464_0
ER  - 
%0 Journal Article
%A David Dussol
%A Philippe Druault
%A Bachar Mallat
%A Sylvain Delacroix
%A Grégory Germain
%T Automatic dynamic mask extraction for PIV images containing an unsteady interface, bubbles, and a moving structure
%J Comptes Rendus. Mécanique
%D 2016
%P 464-478
%V 344
%N 7
%I Elsevier
%R 10.1016/j.crme.2016.03.005
%G en
%F CRMECA_2016__344_7_464_0
David Dussol; Philippe Druault; Bachar Mallat; Sylvain Delacroix; Grégory Germain. Automatic dynamic mask extraction for PIV images containing an unsteady interface, bubbles, and a moving structure. Comptes Rendus. Mécanique, Volume 344 (2016) no. 7, pp. 464-478. doi : 10.1016/j.crme.2016.03.005.

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