%0 Conference Paper %1 mellado2010investigation %A Mellado, Juan Pedro %A Wang, Lipo %A Peters, Norbert %B Progress in turbulence III: ITi Conference in Turbulence 2008 %D 2010 %K prev %P 21-24 %T Investigation of the Conditional Scalar Dissipation Rate Across a Shear Layer Using Gradient Trajectories %V 131 %X The dependence on the lateral distance y to the center-plane and on time t of the average of the scalar dissipation rate chi = 2D vertical bar del Z vertical bar(2) conditioned on the scalar Z has been investigated in a temporally-evolving shear layer using a direct numerical simulation. As the inviscid scaling of the unconditional mean dissipation rate is approached, the conditional mean (chi) over barz follows also an approximate self-similar behavior within the time interval considered in the simulations and (chi) over barz shows two strong peaks at a distance of about one vorticity thickness from the center-plane, with dissipation values about 3 times the one in the central region. It is showed that this spatial variation is introduced by the nonturbulent/turbulent transition regions, which are identified by means of gradient trajectories of the scalar field.

@inproceedings{mellado2010investigation, abstract = {The dependence on the lateral distance y to the center-plane and on time t of the average of the scalar dissipation rate chi = 2D vertical bar del Z vertical bar(2) conditioned on the scalar Z has been investigated in a temporally-evolving shear layer using a direct numerical simulation. As the inviscid scaling of the unconditional mean dissipation rate is approached, the conditional mean (chi) over barz follows also an approximate self-similar behavior within the time interval considered in the simulations and (chi) over barz shows two strong peaks at a distance of about one vorticity thickness from the center-plane, with dissipation values about 3 times the one in the central region. It is showed that this spatial variation is introduced by the nonturbulent/turbulent transition regions, which are identified by means of gradient trajectories of the scalar field.}, added-at = {2013-03-21T15:13:41.000+0100}, author = {Mellado, Juan Pedro and Wang, Lipo and Peters, Norbert}, biburl = {https://www.bibsonomy.org/bibtex/2debcb4747adc90131d96ceee8c05869f/itv}, booktitle = {Progress in turbulence III: ITi Conference in Turbulence 2008}, interhash = {fac993882befdd475a00ba29ff5dd077}, intrahash = {debcb4747adc90131d96ceee8c05869f}, keywords = {prev}, pages = {21-24}, series = {Springer Proceedings in Physics}, timestamp = {2014-07-31T07:46:38.000+0200}, title = {Investigation of the Conditional Scalar Dissipation Rate Across a Shear Layer Using Gradient Trajectories}, volume = 131, year = 2010 }