Research of Vortex Identification Algorithm and Its Application to Aircraft Wake Flow Vortices

R. Zhu, Z. Y. Chen, S. Li, Y. Q. Tan, Y. R. Mo, F. Bao, Z. R. Liu

2018

Abstract

Vortex identification is very critical for PIV (Particle Image Velocimetry) post-processing to obtain the precise vortex formation. The research focuses on studying & comparing several popular vortex identification methods which are based on velocity gradient tensor derived the second invariant Q , the characteristic equation discriminant , the complex eigenvalue imaginary part λci and the pressure second eigenvalue λ2. By comparing and analyzing different vortex identification algorithms to detect the vortex region, the criteria with the best display effect is applied to the aircraft vortex data of the four vortices system to study the influence of the initial vortex and the initial position of the vortex on the dissipation of the main vortex. The research results indicate that the higher small-vortex initial circulation will speed up primary vortex dissipation and the wake vortex strength may reach weakest as the small-vortex initial circulation is of an appropriate value. The closer the initial position of small-vortex to primary vortex will also speed up vortices interactions but non-linearly related to primary vortex dissipation, and if the distance is too close, it will cause the small vortex to be thrown off by the main vortex.

Paper Citation

in Harvard Style

Zhu R., Chen Z., Li S., Tan Y., Mo Y., Bao F. and Liu Z. (2018). Research of Vortex Identification Algorithm and Its Application to Aircraft Wake Flow Vortices.In Proceedings of the International Workshop on Materials, Chemistry and Engineering - Volume 1: IWMCE, ISBN 978-989-758-346-9, pages 143-151. DOI: 10.5220/0007435701430151

in Bibtex Style

@conference{iwmce18,
author={R. Zhu and Z. Y. Chen and S. Li and Y. Q. Tan and Y. R. Mo and F. Bao and Z. R. Liu},
title={Research of Vortex Identification Algorithm and Its Application to Aircraft Wake Flow Vortices},
booktitle={Proceedings of the International Workshop on Materials, Chemistry and Engineering - Volume 1: IWMCE,},
year={2018},
pages={143-151},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0007435701430151},
isbn={978-989-758-346-9},
}

in EndNote Style

TY - CONF

JO - Proceedings of the International Workshop on Materials, Chemistry and Engineering - Volume 1: IWMCE,
TI - Research of Vortex Identification Algorithm and Its Application to Aircraft Wake Flow Vortices
SN - 978-989-758-346-9
AU - Zhu R.
AU - Chen Z.
AU - Li S.
AU - Tan Y.
AU - Mo Y.
AU - Bao F.
AU - Liu Z.
PY - 2018
SP - 143
EP - 151
DO - 10.5220/0007435701430151