Existence, stability and long time behaviour of weak solutions of the three-dimensional compressible Navier-Stokes equations with potential force

Abstract We address the global-in-time existence, stability and long time behaviour of weak solutions of the three-dimensional compressible Navier-Stokes equations with potential force. We show the details of the α-dependence of different smoothing rates for weak solutions near t = 0 under the assumption on the initial velocity u 0 that u 0 ∈ H α for α ∈ ( 1 2 , 1 ] and obtain long time convergence of weak solutions in various norms. We then make use of the Lagrangian framework in comparing the instantaneous states of corresponding fluid particles in two different solutions. The present work provides qualitative results on the long time behaviour of weak solutions and how the weak solutions depend continuously on initial data and steady states.

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