On the use of full particle trajectories and vorticity transport for dense velocity field reconstruction

On the use of full particle trajectories and vorticity transport for dense velocity field reconstruction

Schneiders, J.F.G. (TU Delft Aerodynamics)
Scarano, F. (TU Delft Flow Physics and Technology; TU Delft Aerodynamics)

Flow Physics and Technology

2018

A procedure is proposed to reconstruct the instantaneous velocity field from full particle trajectories in a data assimilation framework that includes the vorticity transport equation. The technique is christened as time-segment assimilation (TSA). The work addresses the common problem of low seeding concentration in 3D experiments, usually leading to limited spatial resolution. In the present study the measurement fidelity and spatial resolution are increased by considering finite time-segments as a whole for instantaneous velocity reconstruction. The use of a time-segment for velocity field reconstruction from measurement data extends previously proposed data assimilation techniques that consider only instantaneous measurement data (e.g. VIC+ and FlowFit), to use finite measurement time-segments. The assessment with sinusoids indicates lower errors due to modulation. However, the appearance of a range of amplified peaks is not fully understood. In the case of a simulated turbulent boundary layer measurement more vortical structures are recovered when a longer time-segment is used for the velocity field reconstruction.

Large-scale PIV
HFSB
on-site
sports aerodynamics

http://resolver.tudelft.nl/uuid:68684fcb-7995-44f5-b4e7-f684860ac75f

Proceedings of the 19th international symposium on application of laser and imaging techniques to fluid mechanics

LXLASER2018: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics, 2018-07-16 → 2018-07-19, Lisbon, Portugal

Institutional Repository

conference paper

© 2018 J.F.G. Schneiders, F. Scarano