Research output: Contribution to journal › Conference article › peer-review
Analysis of mean and fluctuating helicity measured by TomoPIV in swirling jet. / Stepanov, Rodion; Frick, Peter; Dulin, Vladimir et al.
In: EPJ Web of Conferences, Vol. 180, 02097, 04.06.2018.Research output: Contribution to journal › Conference article › peer-review
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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 -
ID: 14318405