Development of a Hybrid DSMC/Navier-Stokes Solver with Application to the STS-119 Boundary Layer Transition Flight Experiments

Abstract

The effects of rarefaction on hypersonic boundary layer flow over a discrete surface roughness element are examined in the context of the STS-119 flight experiment. The purpose of this flight experiment was to acquire data regarding the onset of roughnessinduced boundary layer transition during atmospheric entry of the Orbiter. Transition onset was confirmed at a freestream Mach number M∞ = 15. 1

Development and validation of a coupled Navier–Stokes/DSMC simulation for rarefied gas flow in the production process for OLEDs

“…Rocket mode lightcraft flow is analysed with a hybrid NS/DSMC simulation in [8] and in [9] an NS/DSMC simulation is applied to study the flow in the head-disk interface gap. Another hybrid simulation with application to the STS-119 boundary layer transition flight experiment is presented in [10].…”

Parametric Study of Hypersonic Boundary Layer Flow over Discrete Surface Roughness Using a Hybrid DSMC/Navier-Stokes Solver

“…16 In this work we employ a nonequilibrium surface reservoir approach for particle generation within a boundary layer. 17 The particles are generated from a nonequilibrium surface distribution specified by:…”

“…It is possible, however to compute the collision integrals Ω 1 st (1) and Ω 2 st (2) in terms of the VHS parameters in DAC, thereby allowing for the VHS parameters to be used to 'tune' the DAC solver in order to achieve consistency between the DAC and DPLR transport properties. The details of this process may be found in Stephani et al 17 The resulting fitted VHS parameters employed in this work are listed in Table 2, and the corresponding transport coefficients are plotted as a function of temperature in Figures 2 and 3. Vibrational relaxation times in both DPLR and DAC are determined using the Landau-Teller model for simple harmonic oscillators, along with empirical correlations of the vibrational relaxation times from Millikan and White and Park's high-temperature correction.…”

“…Near the wall, the computational cells were refined to achieve mean free path resolution, and an increased particle density was imposed in these near-wall cells to ensure convergence in the surface quantities. 17 Nearest neighbor collision pairing was used throughout the entire domain to further enhance the computational resolution. Two DPLR solutions were generated for comparison to the hybrid solution; the first solution employs a no-slip isothermal wall condition at the surface, while the second solution uses a slip wall condition.…”