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Stochastic solutions of Navier–Stokes equations: An experimental evidence (CROSBI ID 167490)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Đurek, Ivan ; Đurek, Danijel ; Petošić, Antonio Stochastic solutions of Navier–Stokes equations: An experimental evidence // Chaos, 20 (2010), 4; 43107-1-43107-7. doi: 10.1063/1.3495962

Podaci o odgovornosti

Đurek, Ivan ; Đurek, Danijel ; Petošić, Antonio

engleski

Stochastic solutions of Navier–Stokes equations: An experimental evidence

An electrodynamic loudspeaker has been operated in anharmonic regime indicated by the nonlinear ordinary differential equation when spring constant γ in restoring term, as well as, viscoelasticity of the membrane material, increases with displacement. For driving currents in the range of 2.8–3.3 A, doubling of the vibration period appears, while for currents in the range of 3.3–3.6 A, multiple sequences of subharmonic vibrations begin with f/4 and 3f/4. An application of currents higher than 3.6 A results in a spectrum, characteristic for the chaotic state. The loudspeaker was then operated in a closed chamber, and subharmonic vibrations disappeared by an evacuation. Subsequent injection of air revoked them again at ∼ 120 mbar (Re′ = 476) when air viscous forces dominate the Morse convection. At 430 mbar (Re = 538) single vibration state was restored, and the phenomenon is in an agreement with prediction of the five mode truncation procedure applied to the Navier–Stokes equations describing a two-dimensional incompressible fluid.

loudspeaker; chaos; navier-stokes

nije evidentirano

nije evidentirano

nije evidentirano

nije evidentirano

nije evidentirano

nije evidentirano

Podaci o izdanju

20 (4)

2010.

43107-1-43107-7

objavljeno

1054-1500

10.1063/1.3495962

Povezanost rada

Fizika, Elektrotehnika, Matematika

Poveznice
Indeksiranost