Figure 1.

Schematic of the reference cell, ${\mathcal{Y}}^{}$, decomposed into the fluid domain ${\mathcal{Y}}^{\mathcal{F}}$, the solid domain ${\mathcal{Y}}^{\mathcal{S}}$ and the interface ${\mathcal{Y}}^{\mathit{\Gamma }}$. (Adapted from [39], fig. 1.)