Finite Amplitude Stability of Internal Steady Flows of the Giesekus Viscoelastic Rate-Type Fluid

Abstrakt

Using a Lyapunov type functional constructed on the basis of thermodynamical arguments, we investigate the finite amplitude stability of internal steady flows of viscoelastic fluids described by the Giesekus model. Using the functional, we derive bounds on the Reynolds and the Weissenberg number that guarantee the unconditional asymptotic stability of the corresponding steady internal flow, wherein the distance between the steady flow field and the perturbed flow field is measured with the help of the Bures-Wasserstein distance between positive definite matrices.

The application of the theoretical results is documented in the finite amplitude stability analysis of Taylor-Couette flow.

Klíčová slova

• viscoelastic rate-type fluids
• nonlinear stability
• Lyapunov functional
• thermodynamics
• thermodynamically open systems
• Bures distance
• Wasserstein metric