Project Description

Purdue University has recently acquired the HyPulse reflected shock/expansion tunnel, which is a short-duration, free-jet wind tunnel in which the test gas is heated by adiabatic compression using shock waves, capable of producing flows at realistic temperatures up to Mach 25 and above. This is a uniquely versatile facility which, through the fabrication of relatively inexpensive nozzles contained within the facility’s test section, is more capable of varying Mach number and flow conditions than comparable high-enthalpy wind tunnels.

High-enthalpy flows pose numerous numerical challenges due to the very steep thermodynamic gradients at the wall. A good trade-off between artificial dissipation, needed to stabilize the calculations, and accuracy is hard to achieve. Commonly used numerical scheme such as WENO guarantee robust results at the expense of loss of accuracy near the cut-off wavenumber and lack a mathematical foundation for compressible subgrid-scale turbulence modeling.

Recent breakthrough in compressible LES modeling in Scalo’s group allows the simulation of transitional and turbulent hypersonic flow, with and without shocks, with a common numerical approach. The current proposal aims to extend this approach to incorporate aerothermochemistry effects and seek validation against experiments carried out by Prof. Jewell in HyPulse, as well as to extend and improve the performance envelope of the HyPulse facility via the design, transient simulation, and development of new nozzles for new hypervelocity flow conditions.

Start Date

Spring/Summer 2022

Postdoctoral Qualifications

PhD in Aerospace or Mechanical Engineering, Applied Physics, Applied Mathematics, or another field closely related to fluid dynamics. Interest and experience in hypersonics desirable--computational modeling or experimental investigation

Co-Advisors

Dr. Joseph Jewell
Assistant Professor of Aeronautics and Astronautics
jsjewell@purdue.edu
https://engineering.purdue.edu/AAE/people/ptProfile?resource_id=221718

Dr. Carlo Scalo
Associate Professor of Mechanical Engineering
cscalo@purdue.edu
https://engineering.purdue.edu/~scalo/

Bibliography

Y Chen, C Scalo, "Trapped waves in supersonic and hypersonic turbulent channel flow over porous walls," Journal of Fluid Mechanics 920 (2021)

R. Oddo, J.L. Hill, M.F. Reeder, D. Chin, J. Embrador, J. Komives, M. Tufts, M. Borg and J.S. Jewell. "Effect of surface cooling on second-mode dominated hypersonic boundary layer transition." Experiments in Fluids, Vol. 62:144 (2021). DOI: 10.1007/s00348-021-03237-0

J.S. Jewell, I.A. Leyva and J.E. Shepherd. "Turbulent spots in hypervelocity flow." Experiments in Fluids, Vol. 58:32, April 2017. DOI: 10.1007/s00348-017-2317-y

J.S. Jewell and R.L. Kimmel. "Boundary Layer Stability Analysis for Stetson's Mach 6 Blunt Cone Experiments." Journal of Spacecraft and Rockets, Vol. 54, No. 1 (2017), pp. 258-265.

J.S. Jewell, N.J. Parziale, I.A. Leyva and J.E. Shepherd. "Effects of Shock-Tube Cleanliness on Hypersonic Boundary Layer Transition at High Enthalpy." AIAA Journal, Vol. 55, No. (2017), pp. 332-338.