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Based on the properties of large-scale plume currents, an injection/suctioncontrol strategy is introduced to enhance the strength of plume currents andthe turbulent transport of passive scalar in rotating plane Poiseuille flow.The control keeps the classical non-penetrative condition on the stable side,and prescribes spanwise varying wall-normal velocity on the unstable side.Direct numerical simulations show that at medium rotation numbers, very weakinjection/suction (the root-mean-square velocity on the controlled side isbelow $1\%$ of the bulk mean velocity) with properly distributed slots couldsignificantly enhance the large-scale plume currents which have the samespatial distribution as the injection slots. In addition, if the distancebetween plume currents are increased, the turbulent transport efficiency can bepromoted. Therefore, taking the strength and transport efficiency into account,the distance between injection slots should be slightly larger than theintrinsic distance between plume currents to achieve maximum enhancement ofturbulent transport. For comparison, the control with non-penetrative conditionon the unstable side and injection/suction on the stable side is also examinedwith simulations. It is found that the injection/suction on the stable side hasmuch weaker influence compared with that on the unstable side. This is becausethat plumes are generated on the unstable side, and that controlling the originof plumes is more effective.

Enhancing large-scale motions and turbulent transport in rotating plane Poiseuille flow