2026-08-22T19:39:34Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/444022024-09-06T17:12:37Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Ortiz De Zárate Leira, José María author Sengers, Jan V. author 2009-04 In this paper we investigate intrinsic thermally excited nonequilibrium velocity fluctuations in laminar planar Couette flow. For this purpose we have complemented the solution of the stochastic Orr-Sommerfeld equation for the intensity of the fluctuations of the wall-normal velocity, presented in a previous publication, with a solution of the stochastic Squire equation for the intensity of the fluctuations of the wall-normal vorticity. We have obtained exact solutions of these equations without boundary conditions and solutions in a Galerkin approximation when appropriate boundary conditions are included. These results enable us to make a quantitative assessment of the intensity of these nonequilibrium fluctuations, as well as of the related energy amplification, which are always present, even in the absence of any externally imposed noise. 1539-3755 10.1103/PhysRevE.79.046308 https://hdl.handle.net/20.500.14352/44402 http://dx.doi.org/10.1103/PhysRevE.79.046308 http://journals.aps.org/ Nonequilibrium velocity fluctuations and energy amplification in planar Couette flow