Vortical motion contributions to stress transport in turbulent boundary layers

@article{klewicki94, abstract = {Four-wire hot-wire probe measurements are used to examine the relationships between the motions bearing spanwise vorticity, z, and the mechanisms responsible for turbulent stress transport. The measurements were carried out in thick zero pressure gradient turbulent boundary layers over the Reynolds number range, 1010<R<4850. Because of the scale of the flow, the spatial resolution of the probe was, in general, very good. The capabilities of the probe allowed all of the terms in the balance equation for u2" align="middle">, except the pressure strain correlation, to be directly measured. Regarding wall region vorticity dynamics, velocity–vorticity correlation measurements are used to investigate z motion contributions to the gradients of the turbulent stresses. In particular, the measured positive correlation between v and z for y + <15 is shown to be consistent with the large –uv" align="middle">/y gradient in this region, and physically, with the outward motion of sublayer streaks. Relationships between the motions bearing z and the sweep and ejection bursting events are examined, and the results are discussed in connection with the turbulent diffusion term in the budget for u2" align="middle">. The present results indicate that in the near-wall region (but outside the sublayer) approximately two-thirds of the contributions to the turbulent diffusion term come from the correlation between the uv shear product and z fluctuations. The overall results are discussed relative to coherent motion interactions and the known properties of the inner region vorticity field. Physics of Fluids is copyrighted by The American Institute of Physics.}, author = {Klewicki, J. C. and Murray, J. A. and Falco, R. E. }, citeulike-article-id = {841737}, doi = {http://dx.doi.org/10.1063/1.868082}, journal = {Physics of Fluids}, keywords = {boundary-layer, coherent-structures, experimental-methods}, number = {1}, pages = {277--286}, posted-at = {2006-09-13 11:01:21}, priority = {2}, publisher = {AIP}, title = {Vortical motion contributions to stress transport in turbulent boundary layers}, url = {http://dx.doi.org/10.1063/1.868082}, volume = {6}, year = {1994} }

TY - JOUR ID - klewicki94 L3 - citeulike-article-id:841737 TI - Vortical motion contributions to stress transport in turbulent boundary layers JF - Physics of Fluids VL - 6 IS - 1 SP - 277 EP - 286 PB - AIP N2 - Four-wire hot-wire probe measurements are used to examine the relationships between the motions bearing spanwise vorticity, z, and the mechanisms responsible for turbulent stress transport. The measurements were carried out in thick zero pressure gradient turbulent boundary layers over the Reynolds number range, 1010<R<4850. Because of the scale of the flow, the spatial resolution of the probe was, in general, very good. The capabilities of the probe allowed all of the terms in the balance equation for u2" align="middle">, except the pressure strain correlation, to be directly measured. Regarding wall region vorticity dynamics, velocity–vorticity correlation measurements are used to investigate z motion contributions to the gradients of the turbulent stresses. In particular, the measured positive correlation between v and z for y + <15 is shown to be consistent with the large –uv" align="middle">/y gradient in this region, and physically, with the outward motion of sublayer streaks. Relationships between the motions bearing z and the sweep and ejection bursting events are examined, and the results are discussed in connection with the turbulent diffusion term in the budget for u2" align="middle">. The present results indicate that in the near-wall region (but outside the sublayer) approximately two-thirds of the contributions to the turbulent diffusion term come from the correlation between the uv shear product and z fluctuations. The overall results are discussed relative to coherent motion interactions and the known properties of the inner region vorticity field. Physics of Fluids is copyrighted by The American Institute of Physics. KW - boundary-layer KW - coherent-structures KW - experimental-methods AU - Klewicki, JC AU - Murray, JA AU - Falco, RE PY - 1994/// UR - http://dx.doi.org/10.1063/1.868082 ER -