Abstract
In this work, we investigate the interaction between a planar normal shock wave and prescribed upstream monochromatic vortical and entropic perturbations in a controlled inviscid framework using Direct Numerical Simulations (DNS). The analysis focuses on the transmission and amplification of vorticity, entropy, and pressure fluctuations across the shock wave, with the aim of isolating the effects induced exclusively by nonideal-gas thermodynamics. The working fluid is a heavy hydrocarbon operated in a thermodynamic regime accurately described by the Peng–Robinson equation of state, representative of dense-gas and supercritical applications. DNS results are systematically compared with predictions from Linear Interaction Analysis (LIA). The comparison provides an assessment of the accuracy of this reduced-order model and identifies the nonlinear mechanisms governing perturbation amplification and mode coupling across shock waves.
