Abstract
The effect of oscillatory shear flows on turbulent transport of passive scalar fields is studied by numerical computations based on the results provided by E. Kim [Physics of Plasmas 13, 022308 (2006)]. Turbulent diffusion is found to depend crucially on the competition between suppression due to shearing and enhancement due to resonances, depending on the characteristic time and length scales of shear flow and turbulence. Enhancements in transport occur for turbulence with finite memory time either due to Doppler or parametric resonances. Scalings of turbulence amplitude and transport are provided in different parameter spaces. The results suggest that oscillatory shear flows are not only less efficient in regulating turbulence, but also can enhance the value of turbulent diffusion, accelerating turbulent transport.
| Original language | English |
|---|---|
| Article number | 122306 |
| Journal | Physics of Plasmas |
| Volume | 14 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 27 Dec 2007 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Condensed Matter Physics
Cite this
Resonance enhanced turbulent transport. / Newton, Andrew P.L.; Kim, Eun Jin.
In: Physics of Plasmas, Vol. 14, No. 12, 122306, 27.12.2007.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Resonance enhanced turbulent transport
AU - Newton, Andrew P.L.
AU - Kim, Eun Jin
PY - 2007/12/27
Y1 - 2007/12/27
N2 - The effect of oscillatory shear flows on turbulent transport of passive scalar fields is studied by numerical computations based on the results provided by E. Kim [Physics of Plasmas 13, 022308 (2006)]. Turbulent diffusion is found to depend crucially on the competition between suppression due to shearing and enhancement due to resonances, depending on the characteristic time and length scales of shear flow and turbulence. Enhancements in transport occur for turbulence with finite memory time either due to Doppler or parametric resonances. Scalings of turbulence amplitude and transport are provided in different parameter spaces. The results suggest that oscillatory shear flows are not only less efficient in regulating turbulence, but also can enhance the value of turbulent diffusion, accelerating turbulent transport.
AB - The effect of oscillatory shear flows on turbulent transport of passive scalar fields is studied by numerical computations based on the results provided by E. Kim [Physics of Plasmas 13, 022308 (2006)]. Turbulent diffusion is found to depend crucially on the competition between suppression due to shearing and enhancement due to resonances, depending on the characteristic time and length scales of shear flow and turbulence. Enhancements in transport occur for turbulence with finite memory time either due to Doppler or parametric resonances. Scalings of turbulence amplitude and transport are provided in different parameter spaces. The results suggest that oscillatory shear flows are not only less efficient in regulating turbulence, but also can enhance the value of turbulent diffusion, accelerating turbulent transport.
UR - http://www.scopus.com/inward/record.url?scp=37549001677&partnerID=8YFLogxK
U2 - 10.1063/1.2821246
DO - 10.1063/1.2821246
M3 - Article
VL - 14
JO - Physics of Plasmas
JF - Physics of Plasmas
SN - 1070-664X
IS - 12
M1 - 122306
ER -