A cavity refers to a concave indentation or space, and the flow passing over this geometry is called cavity flow. Despite its simple geometric shape, the flow field becomes complex due to the self-sustained oscillations of separated shear layers. Cavity flows are commonly found in industrial applications, such as the inter-car gaps of trains and the wheel wells of aircraft. Moreover, cavity flows can cause noise and structural damage to piping systems, making their study particularly important.
TANAKA et al. (Wed,) studied this question.