Geodesic
Numerical investigation of the viscous two-dimensional fluid flow in a closed cell
Sibirskij žurnal industrialʹnoj matematiki, Tome 26 (2023) no. 1, pp. 65-73.

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A two-dimensional flow of a viscous fluid in a cell of finite size is studied numerically. The flow arises as a result of an inverse cascade, supported by a constant pumping. Several different states are observed. One of them is dominated by a large eddy with a well-defined average velocity profile. In the other state, strong chaotic large-scale fluctuations predominate. Laminar flow is observed in the third state. The nature of the definite state depends on the coefficient of the fluid kinematic viscosity, the magnitude of the external pumping force wave vector of the, and the value of the bottom friction factor. When the values of the kinematic viscosity and wave vector are fixed, a small value of the bottom friction factor leads to the appearance of the first state. As the coefficient of bottom friction factor increases, there is a transition from a flow with one large vortex to a laminar flow through a series of states with several unstable vortices, which we call chaotic motion. The paper presents the results of numerical simulation of the of a weakly compressible viscous fluid flow in a closed cell with no-slip boundary conditions on the walls. Pumping is carried out by a static force, periodic in space in two directions. The simulation is carried out for different values of the bottom friction factor.
Mots-clés : 2D turbulence
Keywords: coherent vortex, bottom friction. . 
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A. N. Doludenko; I. V. Kolokolov; V. V. Lebedev; S. V. Fortova. Numerical investigation of the viscous two-dimensional fluid flow in a closed cell. Sibirskij žurnal industrialʹnoj matematiki, Tome 26 (2023) no. 1, pp. 65-73. http://geodesic.mathdoc.fr/item/SJIM_2023_26_1_a5/

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