Abstract
The downburst outflow that triggers thunderstorms and sandstorms can be regarded as a cooling source gravity current (CSGC), which may be quite different from the lock-release gravity current (LRGC). We propose a unified integral model incorporating a continuous velocity transition across the density interface for both CSGC and LRGC. The integral model for CSGC correlates the front characteristics with the thermodynamic and geometric properties of the cooling source, verified by direct numerical simulations. Results also demonstrate that the influence of the shear layer in the dense fluids tends to vanish in LRGC and could be predominant in CSGC.
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