Zobrazeno 1 - 10
of 25
pro vyhledávání: '"sharma, Ati S."'
A family of compressible exact periodic solutions is reported for the first time in an open cavity flow setup. These are found using a novel framework which permits the computation of such solutions in an arbitrary complex geometry. The periodic orbi
Externí odkaz:
http://arxiv.org/abs/1710.03060
Publikováno v:
Phys. Rev. Fluids 1, 032402 (2016)
The relationship between Koopman mode decomposition, resolvent mode decomposition and exact invariant solutions of the Navier-Stokes equations is clarified. The correspondence rests upon the invariance of the system operators under symmetry operation
Externí odkaz:
http://arxiv.org/abs/1603.08378
A novel adjoint-based framework oriented to optimal flow control in compressible direct numerical simulations is presented. Also, a new formulation of the adjoint characteristic boundary conditions is introduced, which enhances the stability of the a
Externí odkaz:
http://arxiv.org/abs/1603.05887
This paper describes a robust linear time-invariant output-feedback control strategy to reduce turbulent fluctuations, and therefore skin-friction drag, in wall-bounded turbulent fluid flows, that nonetheless gives performance guarantees in the nonli
Externí odkaz:
http://arxiv.org/abs/1602.07149
Autor:
Sharma, Ati S., Moarref, Rashad, McKeon, Beverley J., Park, Jae Sung, Graham, Michael D., Willis, Ashley P.
Publikováno v:
Phys. Rev. E 93, 021102 (2016)
We report that many exact invariant solutions of the Navier-Stokes equations for both pipe and channel flows are well represented by just few modes of the model of McKeon & Sharma J. Fl. Mech. 658, 356 (2010). This model provides modes that act as a
Externí odkaz:
http://arxiv.org/abs/1503.01701
Publikováno v:
Journal of Fluid Mechanics, Vol. 769, 2015, pp. 687-722
This paper addresses the problem of obtaining low-order models of fluid flows for the purpose of designing robust feedback controllers. This is challenging since whilst many flows are governed by a set of nonlinear, partial differential-algebraic equ
Externí odkaz:
http://arxiv.org/abs/1502.02154
An analytical framework for studying the logarithmic region of turbulent channels is formulated. We build on recent findings (Moarref et al., J. Fluid Mech., 734, 2013) that the velocity fluctuations in the logarithmic region can be decomposed into a
Externí odkaz:
http://arxiv.org/abs/1409.6047
Publikováno v:
J. Fluid Mech. 734:275-316, 2013
We study the Reynolds number scaling and the geometric self-similarity of a gain-based, low-rank approximation to turbulent channel flows, determined by the resolvent formulation of McKeon & Sharma (2010), in order to obtain a description of the stre
Externí odkaz:
http://arxiv.org/abs/1302.1594
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Akademický článek
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