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Heat transfer and the onset of chaos in a spherical, axisymmetric, anelastic model of whole mantle convection |
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Geophysical & Astrophysical Fluid Dynamics,
Volume 53,
Issue 4,
1990,
Page 205-255
L.P. Solheim,
W.R. Peltier,
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摘要:
An isochemical uni-phase model of whole mantle convection has been developed in terms of which factors influencing the onset of time dependent chaotic behavior may be assessed. The model is spherical but restricted in generality to the analysis of axisymmetric solutions. In this paper we have employed it to examine the impact of compressibility and sphericity on the nature and onset of time dependence. Particular attention has been given to an examination of the impact that the onset of time dependence has upon the power law relation that connects the heat transfer (represented by the Nusselt number) to the strength of the thermal forcing (represented by the Rayleigh number). In order to obtain these results very extensive numerical simulations were required and the results themselves should be rather useful in the context of models of the thermal history of the planet.
ISSN:0309-1929
DOI:10.1080/03091929008208928
出版商:Taylor & Francis Group
年代:1990
数据来源: Taylor
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2. |
The behavior of magneto-acoustic-gravity waves near the cusp resonance in a lossless, compressible, isothermal, stratified, electrically conducting and uniformly magnetized atmosphere. II: The valve effect |
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Geophysical & Astrophysical Fluid Dynamics,
Volume 53,
Issue 4,
1990,
Page 257-271
LeonP. J. Kamp,
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PDF (748KB)
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摘要:
In the present paper the behavior of (internal) magneto-acoustic-gravity waves near the cusp resonance in a lossless, compressible, isothermal, stratified, electrically conducting atmosphere that is permeated by a uniform, nearly horizontal magnetic field is re-addressed (Kamp, 1989). The previously analyzed linear conversion of long acoustic-gravity waves into short magneto-acoustic waves that carry off the energy from the resonance region along the magnetic field, is re-analyzed with boundary layer techniques that are based on the smallness of the vertical component of the magnetic field. More specifically the existence of the so-called valve effect for the generated magneto-acoustic mode near the critical level is explicitly demonstrated and shown to be governed by two rivalling effects.
ISSN:0309-1929
DOI:10.1080/03091929008208929
出版商:Taylor & Francis Group
年代:1990
数据来源: Taylor
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