Overturn density-driven

An analytical relation for estimating density-driven fluid overturning was dealt with in detail by England et al. (1995). The relation they used was (symbols as in Table 1)... 

Fig. 7. Model for mixing of fluids by density-driven overturning. As the interface rotates through time, its progress can be represented by the parameter Ixjh.

The model for density-driven fluid overturning discussed above (Fig. 7), and described in equation (10), is strictly designed to represent overturn and mixing of miscible fluids, such as oils of different density. However, reservoir... 

Next, we turn to the classic problem of Rayleigh-Taylor instability for the gravitationally driven overturning of a pair of immiscible superposed fluids in which the upper fluid has a higher density than the lower fluid. This is another example of a problem in which the viscosity of the fluid is not an essential factor in its instability. 

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