Asymptotic profiles and large-time behavior for 3D micropolar fluid equations with possibly vanishing spin viscosity

We consider 3D micropolar flows with possible vanishing spin viscosity and investigate the decay of the energy for large times. We compute first the exact L²-asymptotic profile, as t→+∞, for solutions to the linear 3D micropolar equations, up to the second order. For the nonlinear micropolar system, we first establish the existence of restricted Leray solutions. This new notion of solutions is required because it is not known whether the weak finite energy solutions verify a strong energy inequality. Next, we study the large-time behavior of restricted Leray solutions, and prove that they behave asymptotically in L² like their linear counterpart, up to the critical algebraic decay rate O(t-5/2) for the energy. Applying a remarkable linear enstrophy identity, we show that the microrotation field exhibits faster decay in L² than the velocity field, allowing us to impose our hypothesis on the velocity field only and not on the angular velocity.