Modeling Hypersonic Flow over a Spiked Blunt Body Using Adaptive Mesh Refinement on an Overset Grid

In comparison to conventional single-grid methods, grid-adaptive overset techniques offer a strong, flexible, and efficient solution approach for computational fluid dynamics in the modeling of flows with complex interactions. In this study, we investigate the applicability of the adaptive mesh refinement-capable overset grid approach, consisting of two separate grids, a body-aligned grid and a background Cartesian grid, in the modeling of hypersonic axisymmetric flow over a spiked blunt body. We use a finite-volume, in-house compressible Navier–Stokes solver to model the flow while considering spikes of different lengths and tip shapes. For comparison, we perform computations for the same problem using the single structured grid approach. In addition to qualitative and quantitative comparisons of the data obtained with the two approaches, the computational cost reduction and convergence characteristics of the grid-adaptive overset approach are presented. The obtained results show that the grid-adaptive overset approach is a strong candidate for modeling such flow fields, offering high computational cost reduction at a small loss in accuracy compared to the classical single-grid approach. This minor loss is revealed to be due to flux imbalance at the overset interface where flow discontinuities are intercepted.

کلیدواژه ها:

Adaptive mesh refinemen ، t Chimera ، Hypersonic ، Compressible ، Finite volume method