Reduction of the fluid resistance is always important with respect to the cost and environment. Transport of the scalar (such as heat and chemical species) should be enhanced or prohibited depending on the engineering application. Thus, several ways to control the momentum and scalar have been investigated.

• FENE-P model for the viscoelasticity

• Geometry effect on the drag reduction of the non-Newtonian fluid flows

• Related papers: Lee et al. (in preparation)

• The Reynolds number dependency on the drag reduction regarding the large-scale motion

• Longitudinal patterns of the superhydrophobic surface

• Related papers: Lee et al. (FTC 2015), Yoon et al. (IJHFF 2016)

• Mechanism of the drag reduction by decreasing the fluid viscosity

• Stabilized flows with enhanced dissipation and weakened outer turbulent structures

• Related papers: Lee et al. (JFM 2013)

• The effect of inhomogeneous Reynolds number due to the temperature-dependent viscosity

• Accelerated scalar transfer at the wall when the viscosity of liquid drops by wall heating

• Related papers: Lee et al. (IJHFF 2014)