Development of Fast Deterministic Physically Accurate Solvers for Kinetic Collision Integral for Applications of Near Space Flight and Control Devices
Technical Report,01 Sep 2014,31 Aug 2015
High Performance Technologies Innovations LLC Chantilly United States
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This document is the Final Technical Report for the PETTT Pre-planned Project, PP-SAS-KY06-001-P3, Development of Fast Deterministic Physically Accurate Solvers for Kinetic Collision Integral for Applications of Near Space Flight and Control Devices. The development of predictive capabilities for modeling spacecraft environments in the near-space regime for reentry applications and for satellite trajectories presents significant challenges due to the multi-physics, multi-scale nature of the flows of interest. A challenge directly related to the multi-scale flows over space vehicles is accurate numerical prediction of flows that contain most or all gas dynamic regimes from continuum to rarefied to free molecular. To address this problem, the goal of this project is the improvement of gas dynamics solvers that are currently used across several DoD applications. Significant steps were taken toward the goal by achieving the following objectives The implementation of a new BGK-type model with velocity-dependent collision frequency and an increased fidelity in relaxation of moment a The development of methods for fast evaluation of the Boltzmann collision integral based on the stochastic integration and The validation of the improved physical accuracy of the new modules.