The presence of dust in the Mars atmosphere can adversely affect heat shields of entry vehicles by enhancing erosion and increasing surface heat fluxes. However, the accuracy of numerical simulations investigating these effects is limited due to a lack of well-validated physical models of the particle phase. To address this issue, the sensitivities of computational predictions of dust-induced heating augmentation to different parameters and components of the disperse-phase model are evaluated. In particular, the drag correlation, the Nusselt-number correlation, various contributions to momentum and energy transfer, and particle diameter are examined. Numerical simulations are performed using an Euler–Lagrange methodology, in which the carrier gas is solved with a discontinuous Galerkin method. Very strong sensitivity to the drag correlation, moderate sensitivity to the Nusselt-number correlation, and strong sensitivity to the particle diameter are found. In addition, the quasi-steady drag force and heating rate are the most significant contributors to interphase momentum and energy transfer, respectively. These results can contribute to improving models and identifying knowledge gaps and uncertainties in the appropriate dust conditions.
Sensitivity of Hypersonic Dusty Flows to Physical Modeling of the Particle Phase
Journal of Spacecraft and Rockets ; 58 , 3 ; 653-667
2021-03-24
15 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch