Phase-Textured Complex Viscosity in Linear Viscous Flows: Non-Normality Without Advection, Corner Defects, and 3D Mode Coupling

Lillian St. Kleess

We consider time-harmonic incompressible flow with a spatially resolved complex viscosity field ${\mu }^{\ast }(\mathbf{x},\omega )$ and, at fixed forcing frequency $\omega >0$, its constitutive phase te…