On a Non-local Parameterisation for Shear Turbulence and the Uniqueness of its Solutions |
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Authors: | Benoit Cushman-Roisin Alastair D Jenkins |
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Institution: | (1) Thayer School of Engineering, Dartmouth College, Hanover, NH, 03755-8000, U.S.A;(2) Bjerknes Centre for Climate Research, Geophysical Institute, Allégaten 70, 5007 Bergen, Norway |
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Abstract: | A non-local parameterisation of shear turbulence is proposed, which includes a dimensionless multiplicative constant as the
sole tunable parameter. Analytical and numerical solutions in the case of plane Couette flow exhibit sheared velocity profiles
with logarithmic behaviour near the boundaries, and the classical logarithmic flow profile is reproduced for a semi-infinite
domain. We also prove that the families of analytical solutions obtained are locally unique: if the velocity is a strictly-increasing
function of the distance from the boundary, a small perturbation of the velocity profile must be of the same functional form
as the basic flow. |
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Keywords: | Logarithmic boundary layer Non-local turbulence closure Turbulent Couette flow Transilient turbulence Uniqueness of solution |
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