<p>The vehicle will experience intense aerodynamic heating in the Martian atmosphere, and the forward-facing cavity can effectively provide aerothermal protection. In this paper, the non-equilibrium Navier–Stokes–Fourier equations are utilized to study the thermal protection of the forward-facing cavity on the hy2Foam platform. By introducing a forward-forward cavity, the shock standoff distance is increased, and the peak temperature, peak pressure, and wall heat flux at the axial position are reduced by 11%, 5.28%, and 60%, respectively. Furthermore, a double-rectangular forward-facing cavity is introduced. The study reveals that the shock standoff distance is positively correlated with the depth (<i>L</i>) of the forward-facing cavity, and inversely related to the width (<i>D</i>). The period of oscillation in the cavity becomes longer as the <i>D</i> and <i>L</i> increase. Moreover, the peak temperature and pressure along the axis are decreased by 17.14% and 12.72%, as the <i>L</i> increases.</p>