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1 Bulletin of the Polish Academy of Sciences. Earth Sciences

1 2000

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The dynamics of a square cavity vortex in the light of experiments

Cieślicki K., Lasowska A.

Bulletin of the Polish Academy of Sciences. Earth Sciences

2000

Vol. 48, nr 2

151-159

The problem of an axisymmetrical cavity vortex development after rapid pressure drop increase was treated experimentally. The cavity flow patterns obtained in flow visualisation were of a special interest. The conducted experiments show explicitly that for the small Re numbers the nature of the cavity flow evolution in models with different inlet velocity profiles is different, even though they tend towards the same final state. In the case of the parabolic profile, the flow separation can be observed already at the initial phases of the process. In the case of the flattened profile, the separation occurs much later and undergoes complicated transient phases. It was also demonstrated that linearisation of the Navier-Stokes equation for Re<1 acceptable in the steady state proves to be incorrect in the non-stationary states.