TY - JOUR

T1 - Analysis of mean and fluctuating helicity measured by TomoPIV in swirling jet

AU - Stepanov, Rodion

AU - Frick, Peter

AU - Dulin, Vladimir

AU - Markovich, Dmitriy

N1 - Publisher Copyright: © The Authors, published by EDP Sciences, 2018.

PY - 2018/6/4

Y1 - 2018/6/4

N2 - Important role of helicity was theoretically predicted for the generation of large-scale magnetic fields and atmospheric vortices. Helicity can lead to a reduction of turbulent dissipation in the atmosphere or in a specific constrained flow, e.g. in pipe. We use the TomoPIV data (42 cube of grid points, resolution 0.84 mm) to measure 3D velocity field of turbulent swirling flows. We study spatial distribution of the mean and fluctuating components of energy and helicity. We find that helical turbulence excitation and decay along stream of the jet strongly depend on the inflow swirl. We observe spatial separation of turbulent flow with different sign of helicity while integrated values are conserves. It is shown that large scale swirling flow induces helicity at the small scales. Our results bring valuable materials for benchmark the modern numerical simulations with turbulent closure technique.

AB - Important role of helicity was theoretically predicted for the generation of large-scale magnetic fields and atmospheric vortices. Helicity can lead to a reduction of turbulent dissipation in the atmosphere or in a specific constrained flow, e.g. in pipe. We use the TomoPIV data (42 cube of grid points, resolution 0.84 mm) to measure 3D velocity field of turbulent swirling flows. We study spatial distribution of the mean and fluctuating components of energy and helicity. We find that helical turbulence excitation and decay along stream of the jet strongly depend on the inflow swirl. We observe spatial separation of turbulent flow with different sign of helicity while integrated values are conserves. It is shown that large scale swirling flow induces helicity at the small scales. Our results bring valuable materials for benchmark the modern numerical simulations with turbulent closure technique.

UR - http://www.scopus.com/inward/record.url?scp=85049390305&partnerID=8YFLogxK

U2 - 10.1051/epjconf/201817002097

DO - 10.1051/epjconf/201817002097

M3 - Conference article

AN - SCOPUS:85049390305

VL - 180

JO - EPJ Web of Conferences

JF - EPJ Web of Conferences

SN - 2101-6275

M1 - 02097

T2 - 12th International Conference on Experimental Fluid Mechanics, EFM 2017

Y2 - 21 November 2017 through 24 November 2017

ER -