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The optimal convergence rates of non‐isentropic subsonic Euler flows through the infinitely long three‐dimensional axisymmetric nozzles

This paper is concerned about the optimal convergence rates of non‐isentropic subsonic flows at far fields in three‐dimensional infinitely long axisymmetric nozzles. By using the stream function formulation for the compressible Euler equations, the subsonic Euler flows are equivalent to a quasilinear elliptic equation of the stream function. The key points to prove the convergence rates of subsonic flows at far fields are the choice of compared functions and the maximum principles.