A combined SHAP-guided MARL strategy using U-net predictions of skin-friction and wall pressure achieves 34.44% drag reduction and 34.01% net energy saving with 0.43% normalized input power in turbulent channel flow.
Coherent structures in wall-bounded turbulence , volume=
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At high Reynolds number, large-scale wavy structures in 2D channel flow are unstable to a subharmonic torsional mode with growth rate 0.18 that deforms and splits the waves.
DNS shows spanwise piezoelectric surface waves achieve up to 27.6% drag reduction in turbulent half-channel flow at Re_tau=200.
citing papers explorer
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Explainable deep reinforcement learning reveals energy-efficient control strategies for turbulent drag reduction
A combined SHAP-guided MARL strategy using U-net predictions of skin-friction and wall pressure achieves 34.44% drag reduction and 34.01% net energy saving with 0.43% normalized input power in turbulent channel flow.
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Subharmonic instability of large-scale wavy structures in two-dimensional channels
At high Reynolds number, large-scale wavy structures in 2D channel flow are unstable to a subharmonic torsional mode with growth rate 0.18 that deforms and splits the waves.
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Direct numerical simulations of turbulent drag reduction via piezoelectric actuation
DNS shows spanwise piezoelectric surface waves achieve up to 27.6% drag reduction in turbulent half-channel flow at Re_tau=200.