Recirculation regions in wakes with base bleed

TL;DR

This paper presents an analytical model for recirculation regions in wakes with base bleed, explaining their emergence, behavior, and disappearance, with validation against experimental and simulation data.

Contribution

Introduces a new analytical model that captures key features of recirculation regions in wakes with base bleed, explaining their dynamics and existence conditions.

Findings

Model accurately predicts recirculation region behavior.

Recirculation regions disappear at a critical bleed rate.

Model shows insensitivity to Reynolds number variations.

Abstract

The appearance of detached recirculation regions in wakes with base bleed determines the aerodynamic properties of many natural organisms and technological applications. In this work we introduce an analytical model which captures certain key dimensions of the recirculation region in the wake of porous plates of infinite aspect ratio, along with the porosity range \ks{over which} it exists, when vortex shedding is absent or suppressed. The model is used to interpret why the recirculation region (i) emerges, (ii) migrates away from the body with increasing base bleed, (iii) disappears at a critical bleed and (iv) is partially insensitive to variations in the Reynolds number. The model predictions show considerable agreement with data from laboratory experiments and numerical simulations. exists. The predictions show considerable agreement with data from laboratory experiments and numerical simulations.