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Asymptotic profiles of solutions to the 2D viscous incompressible micropolar fluid flows. (English) Zbl 1170.35336

The paper deals with asymptotic behavior of solutions to the 2D viscous incompressible micropolar fluid flows in the whole space 2 . These flows described by the equations

v ¯ t-(ν+k 2)Δv ¯-k×w+p+(v ¯·)v ¯=f ¯,jw t-γΔw+2kw-k×v ¯+jv ¯·w=g,divv ¯=0,v ¯(x,0)=v ¯ 0 (x),w(x,0)=w 0 (x),

where v ¯=(v 1 ,v 2 ) is the velocity vector field, p is the pressure, w is the scalar gyration field, f ¯ is the given body force, g is the given scalar body moment, ν>0 is the Newtonian kinetic viscosity, j>0 is a gyration parameter, k0 and γ>0 are gyration viscosity coefficients. Here

×v ¯=v 2 x 1 -v 1 x 2 ,×w=w x 2 ,-w x 1 ·

It is proved that the problem has a unique solution. The time decay estimates of this solution in L 2 and L norms are obtained.

MSC:
35B40Asymptotic behavior of solutions of PDE
35Q35PDEs in connection with fluid mechanics
76A05Non-Newtonian fluids
35A05General existence and uniqueness theorems (PDE) (MSC2000)