The generation and modeling of freestream disturbances from hypersonic boundary layers: A resolvent perspective

Turbulent boundary layers (TBL) formed on the walls of hypersonic experimental facilities generate acoustic disturbances which radiate into the freestream (i.e. the test section) and disrupt the measurements conducted within the test section and in the near-wall region (Duan et. al.; Journal of Spacecraft and Rockets 56.2 (2019): 357-368). Hence, accurate theoretical models for the acoustic disturbances generated by TBLs are necessary to account for the impact of the freestream disturbance field on transition studies and experimental designs. In this work, we model the connection between the freestream disturbance field and near-wall generation mechanisms using the resolvent analysis applied to a hypersonic TBL.