103 粘性率が温度に強く依存する場合の熱対流 : 2次元極座標(セッションI)

概要

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The viscosity of the mantle is the strongly dependence of the temperature. We simulate the thermal convection with temperature dependent viscosity in the cylindrical polar coordiate. The model is considered basal-heating and time-dependent convection model of the Boussinesq approximation, infinite Prandtl number and Newtonian fluid. The viscosity of modelled mantle is the function of exponential to the temperature. The ratio across inner and outer boundary is used 0.5. The Rayleigh number is used 6×10^6. The viscosity contrast is used up to 10^5. The result of our calculation is similar to 2D box model: we find three styles of convection, which is Whole layer mode, Sluggish lid mode and Stagnant lid mode. Appearance of the Stagnant lid mode, cylindical annulus case is lower viscosity contrast compared with 2D box model. In this presentation, we discuss about temperature dependence of viscosity required the numerical modelling of mantle convection with geometry and dynamics of the lithosphere based on our simulation result.
日本惑星科学会の論文
1998-10-13