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The short wave-long wave interactions for viscous compressible heat conductive fluids is modeled,following Dias \& Frid(2011),by a Benney-type system coupling Navier-Stokes equations with a nonlinear Schr\"odinger equation along particle paths.We study the global existence of smooth solutions to the Cauchy problem in ${\mathbb R}^3$ when the initial data are small smooth perturbations of an equilibrium state.We also consider the case where the long waves represent the magnetohydrodynamics flow.The talk is based on two joint works with \textsc{Ronghua Pan and Weizhe Zhang} and \textsc{Junxiong Jia and Ronghua Pan}.