Instantaneous Flow Reconstruction from Particle Trajectories with Vortex-in-Cell

Jan Schneiders, P. Singh, Fulvio Scarano

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

The manuscripts presents the working principle of a novel technique to interpolate sparse and scattered particle tracking velocimetry (PTV) measurements onto a dense grid, by using the velocity measurements along a full particle trajectory. The method performs iteratively a vortex-in-cell simulation (Schneiders et al. 2014 in Exp Fluids 55:1692) to minimize the difference between the simulation and the scattered velocity measurements. The optimization is solved using the L-BFGS algorithm where gradients are evaluated efficiently using the adjoint of the vortex-in-cell code. In the numerical assessment, the case of a vortex is considered. At a given seeding concentration, the reconstruction quality of velocity was shown to improve by 50% when a full track is used in comparison to a divergence free reconstruction using only instantaneous velocity. The numerical assessment demonstrates the potential of the method to increase measurement quality and spatial resolution, in comparison to techniques that interpolate velocity using only instantaneous flow information and for example the divergence free constraint.
Original languageEnglish
Title of host publicationProceedings of the 18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
PublisherSpringer
Number of pages10
ISBN (Electronic)978-989-98777-8-8
Publication statusPublished - 2016
Event18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics - The Calouste Gulbenkian Foundation, Lisbon, Portugal
Duration: 4 Jul 20167 Jul 2016
Conference number: 18
http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2016/

Conference

Conference18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
CountryPortugal
CityLisbon
Period4/07/167/07/16
Internet address

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