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COBEM 2021
26th International Congress of Mechanical Engineering
Axisymmetric Rarefied Flow around a Blunted Body: Numerical and Experimental Comparison
Submission Author:
Ruan Ramon Penha dos Passos Pereira , SP
Co-Authors:
Ruan Ramon Penha dos Passos Pereira, Vinicius Daher, Cayo Prado Fernandes Francisco
Presenter: Ruan Ramon Penha dos Passos Pereira
doi://10.26678/ABCM.COBEM2021.COB2021-1639
Abstract
The current paradigm of space exploration includes the growing demand for missions to other planets and the utilization of reusable vehicles. To achieve these goals, numerical simulation tools are needed to predict aerodynamic and aerothermodynamic parameters in different flight regimes. Although, some care must be taken because, specifically under rarefied atmosphere conditions, the continuum hypothesis is not valid. Under these rarefied conditions, traditional Computational Fluid Dynamics (CFD) models are not physically accurate and predictions must be made using tools capable to account the discrete nature of the gas. The widely used of these tools in engineering applications is the Direct Simulation Monte Carlo (DSMC). However, despite their accurate results, DSMC simulations require large computational resources. To decrease the computational cost for DSMC simulations an axisymmetric version of the DSMC method implemented in the OpenFOAM software was recently developed. Here, the axisymmetric DSMC was applied to the simulation of rarefied hypersonic flow conditions around a blunt body. The simulation results were compared with 3D dsmcFoam calculations and wind tunnel data available. The results showed a good agreement between the 3D and the axisymmetric DSMC calculations, with both numerical simulations having good agreement with the experimental data. In the axisymmetric code, there was a decrease in the processing time of results during numerical simulations. The axisymmetric formulation is roughly 127 times faster compared to the 3D DSMC code.
Keywords
DSMC, Aerothermodynamics, Rarefied flows, Axisymmetric flows
