On Local Existence and Blowup Criterion of Strong Solutions to Cauthy Problem of 2D Full Compressible Navier-Stokes System with Vacuum

This paper investigates the Cauthy problem of two-dimensional full compressible Navier-Stokes system with density and temperature vanishing at infinity. For the strong solutions, some a priori weighted $L^2(R^2)$-norm of the gradient of velocity is obtained by the techniques of $A_p$ weights and cancellation of singularity. Based on this key weighted estimate and some basic weighted analysis of velocity and temperature, we establish the local existence and uniqueness of strong solutions with initial vacuum by means of a two-level approximation scheme. Meanwhile, for $q_1$ and $q_2$ as in (1.8), the $L^\infty_tL^{q_1}_x$-norm of velocity and the $L^2_tL^{q_2}_x$-norm of temperature are derived originally. Moreover, we obtain a blowup criterion only in terms of the temporal integral of the maximum norm of divergence of velocity, which is independent of the temperature.

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