This title appears in the Scientific Report :
2017
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevE.96.062617 in citations.
Please use the identifier: http://hdl.handle.net/2128/16597 in citations.
Spatial correlations of hydrodynamic fluctuations in simple fluids under shear flow: A mesoscale simulation study
Spatial correlations of hydrodynamic fluctuations in simple fluids under shear flow: A mesoscale simulation study
Hydrodynamic fluctuations in simple fluids under shear flow are demonstrated to be spatially correlated, in contrast to the fluctuations at equilibrium, using mesoscopic hydrodynamic simulations. The simulation results for the equal-time hydrodynamic correlations in a multiparticle collision dynamic...
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Personal Name(s): | Varghese, Anoop |
---|---|
Gompper, Gerhard / Winkler, Roland G. (Corresponding author) | |
Contributing Institute: |
Theorie der Weichen Materie und Biophysik; IAS-2 Theorie der Weichen Materie und Biophysik; ICS-2 |
Published in: | Physical Review E Physical review / E, 96 96 (2017 2017) 6 6, S. 062617 062617 |
Imprint: |
Woodbury, NY
Inst.
2017
2017-12-28 2017-12-01 |
PubMed ID: |
29347341 |
DOI: |
10.1103/PhysRevE.96.062617 |
Document Type: |
Journal Article |
Research Program: |
Functional Macromolecules and Complexes |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/16597 in citations.
Hydrodynamic fluctuations in simple fluids under shear flow are demonstrated to be spatially correlated, in contrast to the fluctuations at equilibrium, using mesoscopic hydrodynamic simulations. The simulation results for the equal-time hydrodynamic correlations in a multiparticle collision dynamics (MPC) fluid in shear flow are compared with the explicit expressions obtained from fluctuating hydrodynamics calculations. For large wave vectors k, the nonequilibrium contributions to transverse and longitudinal velocity correlations decay as k−4 for wave vectors along the flow direction and as k−2 for the off-flow directions. For small wave vectors, a crossover to a slower decay occurs, indicating long-range correlations in real space. The coupling between the transverse velocity components, which vanishes at equilibrium, also exhibits a k−2 dependence on the wave vector. In addition, we observe a quadratic dependency on the shear rate of the nonequilibrium contribution to pressure. |