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Coherent structures

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July 19, 2011, 18:53	Coherent structures	#1
mnabi New Member M. Nabi Join Date: Jun 2009 Posts: 16 Rep Power: 5	Hi all; In order to plot the coherent structure of turbulence, I use the formulation proposed by Hunt et al. (1988) as $Q=-\frac{1}{2} \frac{\partial u_i}{\partial x_j} \frac{\partial u_j}{\partial x_i} = -\frac{1}{2} \left( \|S\|^2 - \|\Omega\|^2 \right)$ Q will include positive and negative values. Can anybody explain it to me, what is different between positive Q and negative values of Q? Does it have a physical meaning? Thanks Nabi

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