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This paper presents a boundary feedback control design to globally practically exponentially stabilize a viscous incompressible fluid governed by Navier-Stokes equations in a bounded domain in three dimensional space. The control is implemented on a part of the rigid boundary and requires only boundary measurements. The Rothe method and an elliptic approximation are used to handle the time-dependent domain due to the boundary control in the proof of global existence of a weak solution of the closed-loop system. Due to consideration of less regular initial values of the fluid velocity, the forces induced by the fluid on the part of the control boundary are not possible to be bounded. Thus, the paper derives the bound on “fluid work” in stability and convergence analysis of the closed-loop system. The advantage of considering the weak solution is its global existence and less regularity of the initial data.

Boundary feedback stabilisation of a viscous incompressible fluid in a bounded domain