Physics – Fluid Dynamics
Scientific paper
2003-01-29
Physics
Fluid Dynamics
12 pages, 2 figures, RevTeX, and accepted for publication in Phys. Rev. E
Scientific paper
10.1103/PhysRevE.67.026304
Large scale features of a randomly isotropically forced incompressible and unbounded rotating fluid are examined in perturbation theory. At first order in both the random force amplitude and the angular velocity we find two types of modifications to the fluid equation of motion. The first correction transforms the molecular shear viscosity into a (rotation independent) effective viscosity. The second perturbative correction leads to a new large scale non-dissipative force proportional to the fluid angular velocity in the slow rotation regime. This effective force does no net work and alters the dispersion relation of inertial waves propagating in the fluid. Both dynamically generated corrections can be identified with certain components of the most general axisymmetric ``viscosity tensor'' for a Newtonian fluid.
Gaite Jose
Hochberg David
Molina--Paris Carmen
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