标题： 双扩散对流在带有锥形顶盖的旋转圆柱形环域中 显示英文标题

标题： Double-diffusive convection in a rotating cylindrical annulus with conical caps

摘要： 双扩散对流在旋转圆柱形环隙中由热和组分浮力共同驱动，其目的是确定在热浮力中添加少量组分浮力（或反之）是否能显著降低临界雷诺数并增强行星核心中的对流。 结果表明，描述双浮力情况下对流开始的中性面与广泛研究的纯热情况下的中性面有本质的不同，并确实允许低雷诺数对流的可能性。 特别是，在参数空间的某些区域，通过额外的“双扩散”特征模式形成了孤立的不稳定区域。 然而，这种低雷诺数对流的振幅相对较弱。 在相似的流动振幅下，纯组分情况和双扩散情况相比纯热情况表现出更强的时间依赖性，并且在内圆柱表面附近呈现出顺行的平均纬向流动。 对行星核心对流结果的含义进行了简要讨论。 显示英文摘要

摘要： Double-diffusive convection driven by both thermal and compositional buoyancy in a rotating cylindrical annulus with conical caps is considered with the aim to establish whether a small fraction of compositional buoyancy added to the thermal buoyancy (or vice versa) can significantly reduce the critical Rayleigh number and amplify convection in planetary cores. It is shown that the neutral surface describing the onset of convection in the double-buoyancy case is essentially different from that of the well-studied purely thermal case, and does indeed allow the possibility of low-Rayleigh number convection. In particular, isolated islands of instability are formed by an additional "double-diffusive" eigenmode in certain regions of the parameter space. However, the amplitude of such low-Rayleigh number convection is relatively weak. At similar flow amplitudes purely compositional and double-diffusive cases are characterized by a stronger time dependence compared to purely thermal cases, and by a prograde mean zonal flow near the inner cylindrical surface. Implications of the results for planetary core convection are briefly discussed.