Blow-Up Criteria and Weak--Strong Uniqueness for Compressible Fluid--Viscoelastic Shell Interactions

TL;DR

This paper establishes a continuation criterion for strong solutions of a coupled compressible fluid-viscoelastic shell system, based on energy estimates and control assumptions, and proves a weak-strong uniqueness principle under these conditions.

Contribution

It derives a genuine continuation criterion for the system and proves weak-strong uniqueness under this conditional regularity framework.

Findings

A higher-order energy estimate prevents loss of regularity.

Solutions can be extended beyond blow-up time if control norms stay finite.

Weak-strong uniqueness holds under the derived regularity conditions.

Abstract

Existence and uniqueness of strong solutions to a barotropic compressible fluid--viscoelastic shell interaction system have recently been established on a finite time interval. A natural question is whether such solutions can be continued globally. In this work, we derive a continuation criterion for this coupled system. Our analysis is based on an energy estimate at the level of material acceleration, derived under Serrin-type and Beale--Kato--Majda-type control assumptions. While in the incompressible setting, such control is sufficient to prevent finite-time blow-up, in the compressible regime it does not by itself ensure propagation of the full regularity required for strong solutions. To obtain a genuine continuation criterion, we impose a Beale--Kato--Majda Lipschitz-type control on the density and velocity gradients with stronger time integrability. In combination with the control framework underlying the acceleration estimate, we close a higher-order energy estimate and thereby prevent loss of strong-solution regularity. Consequently, the solution can be extended beyond a potential blow-up time, provided that the corresponding control norms remain finite. We further establish a weak-strong uniqueness principle for the system under the above conditional regularity criterion.