TY - GEN
T1 - Hybrid particle-continuum simulations of Low Knudsen number hypersonic flows
AU - Schwartzentruber, Thomas E.
AU - Scalabrin, Leonardo C.
AU - Boyd, Iain D.
PY - 2007
Y1 - 2007
N2 - A modular particle-continuum (MPC) numerical method is used to simulate steady-state hypersonic flows which exhibit local regions of non-equilibrium embedded within mainly continuum flow fields. The MPC method loosely couples direct simulation Monte Carlo (DSMC) and Navier-Stokes (NS) methods which operate in different regions, use different mesh densities, and are updated using different sized timesteps. The MPC method is applied to both a hollow cylinder flare and planetary probe geometry and results are compared with full NS and DSMC simulations as well as with experimental data. MPC simulations are demonstrated to reproduce experimental and full DSMC simulation results for surface and flow field properties including velocity slip, temperature jump, thermal non-equilibrium, heating rates, and pressure distributions with high accuracy. The hollow cylinder flare problem provides an insightful test case for the MPC method, however, it is found un-suitable for practical hybrid simulation. Orders of magnitude variation in mean-free-path for the planetary probe problem make it an excellent candidate for hybrid simulation. For this case, MPC results are obtained approximately 12.5 times faster than a full DSMC simulation while requiring 20% of the memory.
AB - A modular particle-continuum (MPC) numerical method is used to simulate steady-state hypersonic flows which exhibit local regions of non-equilibrium embedded within mainly continuum flow fields. The MPC method loosely couples direct simulation Monte Carlo (DSMC) and Navier-Stokes (NS) methods which operate in different regions, use different mesh densities, and are updated using different sized timesteps. The MPC method is applied to both a hollow cylinder flare and planetary probe geometry and results are compared with full NS and DSMC simulations as well as with experimental data. MPC simulations are demonstrated to reproduce experimental and full DSMC simulation results for surface and flow field properties including velocity slip, temperature jump, thermal non-equilibrium, heating rates, and pressure distributions with high accuracy. The hollow cylinder flare problem provides an insightful test case for the MPC method, however, it is found un-suitable for practical hybrid simulation. Orders of magnitude variation in mean-free-path for the planetary probe problem make it an excellent candidate for hybrid simulation. For this case, MPC results are obtained approximately 12.5 times faster than a full DSMC simulation while requiring 20% of the memory.
UR - http://www.scopus.com/inward/record.url?scp=35748971788&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=35748971788&partnerID=8YFLogxK
U2 - 10.2514/6.2007-3892
DO - 10.2514/6.2007-3892
M3 - Conference contribution
AN - SCOPUS:35748971788
SN - 156347901X
SN - 9781563479014
T3 - Collection of Technical Papers - 39th AIAA Thermophysics Conference
SP - 16
EP - 32
BT - Collection of Technical Papers - 39th AIAA Thermophysics Conference
PB - American Institute of Aeronautics and Astronautics Inc.
T2 - 39th AIAA Thermophysics Conference
Y2 - 25 June 2007 through 28 June 2007
ER -