Cyclic convection in a zone bounded by stable layers

Details Cyclic convection in a zone bounded by stable layers Cyclic convection in a zone bounded by stable layers

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phrve..55.2769h&link_type=abstract

Physical Review E (Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics), Volume 55, Issue 3, March 1997,

Physics

2

Scientific paper

We have simulated compressible convection in two distinct but related cases: (i) a single layer of unstable material is in contact with impenetrable boundaries and (ii) a layer of unstable material that is identical to that of case (i) except that it is now 'sandwiched' between two thick stable layers. The convection is driven equally strongly in both cases. We find that convection in the single layer is steady, whereas in the 'sandwich' case, the convection exhibits nonsteady behavior of a particular kind: the convection is cyclic. During one part of the cycle, the convective flux FC falls to levels that are too small for energy balance. During the second part of the cycle, conduction increases in an attempt to restore energy, but this eventually drives the fluid back to convective instability, with a subsequent increase in FC . In the course of the cycle, the fluctuations in FC are large (factors of 2-3). We comment on the applicability of our results to convection in the sun.

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