What question did this study set out to answer?

This research aims to clarify how rough grain morphology affects drag in low-Reynolds-number flows.

Drag coefficient of a rough grain submerged in low-Reynolds-number flow

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Numerical investigation of drag coefficients on rough grains, suggesting insights for fluid-particle interactions.

This research aims to clarify how rough grain morphology affects drag in low-Reynolds-number flows.
Numerical analysis of the drag on fractally rough grains represented by spherical harmonics.
Comparison of drag coefficients of rough grains and corresponding smooth spheres at various rotation angles.
Derivation of a power law relating drag coefficient and projected area in the flow direction.
Rough shapes lead to a reduction in drag, with the mean drag coefficient indicated to be lower than smooth counterparts.
A power law was established: drag coefficient (C_D) is proportional to projected area (A_p) raised to the power of -0.8 (C_D ∝ A_p^-0.8).
Microanalyses reveal that net drag reduction results primarily from frictional drag during fluid–grain interactions.

Suo et al. (2026) studied this question.

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