Abstract
SummaryWe consider the coupling between the equations of motion of a compressible fluid in two and three space dimensions with Christov’s equation for the heat flux. Christov’s equation is a frame indifferent formulation of the classical model of Cattaneo that allows for the heat flux to be eliminated to obtain a single hyperbolic equation for the temperature. The obtained system is written in quasilinear form for the state variables density, velocity, temperature and heat flux. It is then shown that this system is not of hyperbolic type as a consequence of the presence of the Lie–Oldroyd upper-convected material derivative involved in Christov’s formulation.
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