September 10, 2025Physics of Fluids

Large eddy simulation of inflow velocity effects on flow characteristics in a square-section diffuser

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Analysis demonstrates that inflow velocity enhances pressure recovery in square-section diffusers, suggesting potential for improved efficiency.

Increasing inflow velocity significantly enhances static pressure recovery and reduces total pressure loss.
Two types of separation are identified: centerline bubble at the diverging entrance and large-scale corner separations.
Turbulent kinetic energy and Reynolds stresses increase, indicating improved flow stability despite localized instabilities.
Findings provide insights into flow separation mechanisms, aiding the optimization of diffuser performance.

Zhou et al. (2025) studied this question.

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Analysis demonstrates that inflow velocity enhances pressure recovery in square-section diffusers, suggesting potential for improved efficiency.