scholarly journals An upper bound for passive scalar diffusion in shear flows

2007 ◽  
Vol 19 (6) ◽  
pp. 068104 ◽  
Author(s):  
Chuong V. Tran
Keyword(s):  
Upper Bound ◽  
Shear Flows ◽  
Passive Scalar ◽  
Scalar Diffusion

A multi-relaxation lattice kinetic method for passive scalar diffusion

2005 ◽  
Vol 206 (2) ◽  
pp. 453-462 ◽  
Author(s):  
Igor Rasin ◽  
Sauro Succi ◽  
Wolfram Miller
Keyword(s):  
Kinetic Method ◽  
Passive Scalar ◽  
Scalar Diffusion

Passive-scalar diffusion in a fluid membrane

2002 ◽  
Vol 116 (18) ◽  
pp. 7787-7794 ◽  
Author(s):  
Youhei Fujitani
Keyword(s):  
Passive Scalar ◽  
Fluid Membrane ◽  
Scalar Diffusion

scholarly journals Passive Scalar Diffusion as a Damped Wave

2005 ◽  
pp. 3-6
Author(s):  
Axel Brandenburg ◽  
Petri J. Käpylä ◽  
Amjed Mohammed
Keyword(s):  
Passive Scalar ◽  
Scalar Diffusion

scholarly journals Modelling and Experimental Validation of a Passive Scalar Diffusion

2012 ◽  
Vol 7 (5) ◽  
pp. 363-371
Author(s):  
D. Tcheukam- Toko ◽  
C.A. Koueni-Tok ◽  
R. Mouangue ◽  
P. Paranthoen
Keyword(s):  
Experimental Validation ◽  
Passive Scalar ◽  
Scalar Diffusion

Fast scalar decay in a shear flow: modes and pseudomodes

2007 ◽  
Vol 572 ◽  
pp. 219-229 ◽  
Author(s):  
J. VANNESTE ◽  
J. G. BYATT-SMITH
Keyword(s):  
Shear Flow ◽  
Eigenvalue Problem ◽  
Decay Rate ◽  
Shear Flows ◽  
Passive Scalar ◽  
Decay Rates ◽  
Constant Speed ◽  
Fast Decay ◽  
Small Noise ◽  
Stream Direction

The decay of a passive scalar in a sinusoidal shear flow translating in the cross-stream direction at a constant speed u is studied in the limit of small diffusivity κ. The decay rate, obtained by solving an eigenvalue problem, is found to tend to a non-zero constant as κ→0 when u is of order κ1/2. This result, establishing that fast decay is possible in shear flows, is fragile however: because of the existence of pseudomodes, the addition of a small noise leads to decay rates that decrease to zero with κ as κ2/5.

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