The interaction of vorticity and rate-of-strain in homogeneous sheared turbulence

@article{citeulike:700452, abstract = {The coupled interaction of vorticity and rate-of-strain in homogeneous sheared turbulence is investigated using direct numerical simulation. Conditional sampling and comparison with linear simulations reveal various aspects of the structure and dynamics. Due to the influence of the imposed and , distinct directional features develop. Initial stretching of fluctuating by mean extensional strain and the presence of mean vorticity establish a predominant misalignment of with respect to the principal axes of . The associated locally induced rotation of the axes results in preferred orientations in and . In high amplitude rotation-dominated regions of the flow, distinct characteristics are exhibited by the pressure Hessian due to the presence of small-scale spatial structure. Nonlocally induced axes rotation through tends to counteract locally induced rotation in these regions. These features are absent in the linear flow which suggests a lack of spatial coherence in the corresponding intense 2 regions. High amplitude strain-dominated and comparable rotation-strain regions are also considered. In general, the high amplitude conditional samples capture the main features of the flow. The underlying behavior of and is essentially the same as in isotropic turbulence; the directional preferences observed in shear flow demonstrate the physical implications of the associated mechanisms. Although there is greater directional variation in flows with high Re/Sh, results indicate the significance of the persistence of mean shear. \©2000 American Institute of Physics.}, author = {Nomura, K. K. and Diamessis, P. J. }, citeulike-article-id = {700452}, doi = {10.1063/1.870340}, journal = {Physics of Fluids}, keywords = {homogeneous, mean-shear, small-scale, strain, vorticity}, number = {4}, pages = {846--864}, posted-at = {2006-06-19 08:12:34}, priority = {3}, publisher = {AIP}, title = {The interaction of vorticity and rate-of-strain in homogeneous sheared turbulence}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PHFLE6000012000004000846000001\&idtype=cvips\&gifs=yes}, volume = {12}, year = {2000} }

TY - JOUR ID - citeulike:700452 L3 - citeulike-article-id:700452 TI - The interaction of vorticity and rate-of-strain in homogeneous sheared turbulence JF - Physics of Fluids VL - 12 IS - 4 SP - 846 EP - 864 PB - AIP N2 - The coupled interaction of vorticity and rate-of-strain in homogeneous sheared turbulence is investigated using direct numerical simulation. Conditional sampling and comparison with linear simulations reveal various aspects of the structure and dynamics. Due to the influence of the imposed and , distinct directional features develop. Initial stretching of fluctuating by mean extensional strain and the presence of mean vorticity establish a predominant misalignment of with respect to the principal axes of . The associated locally induced rotation of the axes results in preferred orientations in and . In high amplitude rotation-dominated regions of the flow, distinct characteristics are exhibited by the pressure Hessian due to the presence of small-scale spatial structure. Nonlocally induced axes rotation through tends to counteract locally induced rotation in these regions. These features are absent in the linear flow which suggests a lack of spatial coherence in the corresponding intense 2 regions. High amplitude strain-dominated and comparable rotation-strain regions are also considered. In general, the high amplitude conditional samples capture the main features of the flow. The underlying behavior of and is essentially the same as in isotropic turbulence; the directional preferences observed in shear flow demonstrate the physical implications of the associated mechanisms. Although there is greater directional variation in flows with high Re/Sh, results indicate the significance of the persistence of mean shear. ©2000 American Institute of Physics. KW - homogeneous KW - mean-shear KW - small-scale KW - strain KW - vorticity AU - Nomura, KK AU - Diamessis, PJ PY - 2000/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PHFLE6000012000004000846000001&idtype=cvips&gifs=yes ER -