Identification method for vortex sheet structures in turbulent flows

@article{horiuti05, abstract = {A new identification method was proposed for an eduction of vortex sheet structures in turbulent flows. This method took advantage of a prominent feature of a sheet, i.e., comparable dominance of both strain rate and vorticity and their strong correlation. The effectiveness of the proposed method was presented in the assessment using direct numerical simulation data for homogeneous isotropic turbulence. Both strain rate and vorticity were indeed large and correlated in the region identified using the proposed method. As a result, intense dissipation took place in the educed region. The relationship between the eigenvalue solution used in the present method and the invariants of fourth-order moments of velocity gradients was discussed. It was shown that the proposed method performed better than other invariants and previous identification methods for educing the vortex sheets. {\copyright}2005 American Institute of Physics}, author = {Horiuti, Kiyosi and Takagi, Youhei }, citeulike-article-id = {840891}, comment = {vortex coherent-structures identification invariants gradient-tensor}, doi = {http://dx.doi.org/10.1063/1.2147610}, journal = {Physics of Fluids}, keywords = {coherent-structures, gradient-tensor, identification, invariants, vortex}, number = {12}, posted-at = {2006-09-12 12:51:12}, priority = {3}, publisher = {AIP}, title = {Identification method for vortex sheet structures in turbulent flows}, url = {http://dx.doi.org/10.1063/1.2147610}, volume = {17}, year = {2005} }

TY - JOUR ID - horiuti05 L3 - citeulike-article-id:840891 TI - Identification method for vortex sheet structures in turbulent flows JF - Physics of Fluids VL - 17 IS - 12 PB - AIP N2 - A new identification method was proposed for an eduction of vortex sheet structures in turbulent flows. This method took advantage of a prominent feature of a sheet, i.e., comparable dominance of both strain rate and vorticity and their strong correlation. The effectiveness of the proposed method was presented in the assessment using direct numerical simulation data for homogeneous isotropic turbulence. Both strain rate and vorticity were indeed large and correlated in the region identified using the proposed method. As a result, intense dissipation took place in the educed region. The relationship between the eigenvalue solution used in the present method and the invariants of fourth-order moments of velocity gradients was discussed. It was shown that the proposed method performed better than other invariants and previous identification methods for educing the vortex sheets. ©2005 American Institute of Physics KW - coherent-structures KW - gradient-tensor KW - identification KW - invariants KW - vortex N1 - vortex coherent-structures identification invariants gradient-tensor AU - Horiuti, Kiyosi AU - Takagi, Youhei PY - 2005/// UR - http://dx.doi.org/10.1063/1.2147610 ER -