TY - GEN
T1 - Assessment of synthetic inflow generation for simulating injection into a supersonic crossflow
AU - Peterson, David M.
AU - Subbareddy, Prarnod K.
AU - Candler, Graham V.
PY - 2006
Y1 - 2006
N2 - Detached eddy simulation is used to simulate the flow field around gaseous jets injected into supersonic crossflows. The simulations are done with and without the use of synthetic inflow generation, a method used to provide a realistic, time-varying boundary layer for the inflow condition of the simulations. The goal is to assess the ability of DES to simulate the complicated flow field around the injection location, and to assess the ability of synthetic inflow generation to capture the contribution of the preinjection boundary layer to the flow field. Reynolds stresses and turbulent kinetic energy predicted by the simulations are compared to experimentally measured values in one test case of normal injection of air into a Mach 1.6 freestream. A second test case compares predicted mean injectant mole fractions with measured values for a pair of staged injectors that inject air into a Mach 2 freestream. Unlike previous simulations of jets in supersonic crossflows done by the authors, the DES provides highly unsteady jet plumes, even without the synthetic inflow boundary layer. This is due partially to improved mesh resolution, but is mostly due to large and highly energetic separation regions upstream of the normal injectors, compared to smaller, less energetic regions upstream of the angled injectors simulated previously. As a result of the natural instability of these configurations, the role of the boundary layer structures is found to be small. However, the results show that DES reproduces the mean and fluctuating quantities very well compared to the measured values.
AB - Detached eddy simulation is used to simulate the flow field around gaseous jets injected into supersonic crossflows. The simulations are done with and without the use of synthetic inflow generation, a method used to provide a realistic, time-varying boundary layer for the inflow condition of the simulations. The goal is to assess the ability of DES to simulate the complicated flow field around the injection location, and to assess the ability of synthetic inflow generation to capture the contribution of the preinjection boundary layer to the flow field. Reynolds stresses and turbulent kinetic energy predicted by the simulations are compared to experimentally measured values in one test case of normal injection of air into a Mach 1.6 freestream. A second test case compares predicted mean injectant mole fractions with measured values for a pair of staged injectors that inject air into a Mach 2 freestream. Unlike previous simulations of jets in supersonic crossflows done by the authors, the DES provides highly unsteady jet plumes, even without the synthetic inflow boundary layer. This is due partially to improved mesh resolution, but is mostly due to large and highly energetic separation regions upstream of the normal injectors, compared to smaller, less energetic regions upstream of the angled injectors simulated previously. As a result of the natural instability of these configurations, the role of the boundary layer structures is found to be small. However, the results show that DES reproduces the mean and fluctuating quantities very well compared to the measured values.
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M3 - Conference contribution
AN - SCOPUS:33947267518
SN - 1563478269
SN - 9781563478260
T3 - A Collection of Technical Papers - 14th AIAA/AHI International Space Planes and Hypersonic Systems and Technologies Conference
SP - 2195
EP - 2208
BT - A Collection of Technical Papers - 14th AIAA/AHI International Space Planes and Hypersonics Systems Technologies Conference
T2 - 14th AIAA/AHI International Space Planes and Hypersonics Systems Technologies Conference
Y2 - 6 November 2006 through 9 November 2006
ER -