Taconis oscillation in a closed long tube is studied by the numerical simulation of two-dimensional compressible Navier-Stokes equations. Conditions are used where both end walls of the tube are hot (
T =
TH), and the central regions of the side walls are cold (
T =
TC). The oscillation can be spontaneously generated when the temperature ratio (
TH/
TC) is larger than 7.1, whereas it can be damped when the temperature ratio is smaller than 5.7. We obtained two different critical temperature ratios and observed the hysteresis phenomenon.
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