Interacting passive advective scalars in an active medium
نویسندگان
چکیده
منابع مشابه
Passive Scalars in Stratified Turbulence
The statistics of a passive scalar in randomly forced and strongly stratified turbulence is investigated by numerical simulations including a horizontal passive scalar mean gradient. We observe that horizontal isotropy of the passive scalar spectrum is satisfied in the inertial range. The spectrum has the form Eθ(kh) = Cθεθε −1/3 K k −5/3 h , where εθ, εK are the dissipation of scalar variance ...
متن کاملDynamics of the orientation of active and passive scalars in two-dimensional turbulence
The active nature of vorticity is investigated in order to understand its difference with a passive scalar. The direct cascade down to small scales is examined through both classical and new diagnostics ~based on tracer gradient properties! in numerical simulations of freely decaying two-dimensional ~2D! turbulence. During the transient evolution of turbulence, the passive scalar possesses a st...
متن کاملPassive Scalars and Three-dimensional Liouvillian Maps *
Global aspects of the motion of passive scalars in time-dependent incompressible fluid flows are well described by volume-preserving (Liouvillian) three-dimensional maps. In this paper the possible invariant structures in Liouvillian maps and the two most interesting nearly-integrable cases are investigated. In addition, the fundamental role of invariant lines in organizing the dynamics of this...
متن کاملAn actuated elastic sheet interacting with passive and active structures in a viscoelastic fluid
Paramecium swimming in capillary tube Phys. Fluids 24, 041901 (2012) Orientational order in concentrated suspensions of spherical microswimmers Phys. Fluids 23, 111702 (2011) Microfluidic droplet encapsulation of highly motile single zoospores for phenotypic screening of an antioomycete chemical Biomicrofluidics 5, 044103 (2011) Measuring oscillatory velocity fields due to swimming algae Phys. ...
متن کاملStatistics and geometry of passive scalars in turbulence
We present direct numerical simulations of the mixing of the passive scalar at modest Taylor microscale 10 R 42 and Schmidt numbers larger than unity 2 Sc 32 . The simulations resolve below the Batchelor scale up to a factor of 4. The advecting turbulence is homogeneous and isotropic, and is maintained stationary by stochastic forcing at low wave numbers. The passive scalar is rendered stationa...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review E
سال: 2018
ISSN: 2470-0045,2470-0053
DOI: 10.1103/physreve.98.052608