Abstract
Fluid compressibility effects arising from thermal rather than dynamical aspects are theoretically investigated in the framework of turbulent flows. The Mach number is considered low and not to induce significant compressibility effects which here occur due to a very high thermal gradient within the flowfield. With the use of the Two-Scale Direct Interaction Approximation approach, essential turbulent correlations are derived in a one-point one-time framework. In the low velocity gradient limit, they are shown to directly depend on the temperature gradient, assumed large. The impact of thermal effects onto the transport equations of the turbulent kinetic energy and dissipation rate is also investigated, together with the transport equation for both the density and the internal energy variance.
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Communicated by S. Sarkar
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Mathelin, L., Bataille, F. & Zhou, Y. Theoretical investigation of some thermal effects in turbulence modeling. Theor. Comput. Fluid Dyn. 22, 471–483 (2008). https://doi.org/10.1007/s00162-008-0087-0
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DOI: https://doi.org/10.1007/s00162-008-0087-0