Receptivity analysis in under-expanded supersonic impinging jets
S Karami, P Stegeman, A Ooi, V Theofilis, J Soria
Journal of Fluid Mechanics | Australasian Fluid Mechanics Society | Published : 2020
This paper presents the receptivity process at the nozzle-lip to an external forcing in the configuration of under-expanded supersonic impinging jets. The nozzle-lip is considered as a linear transformer. Therefore, the linearised three-dimensional Navier Stokes equations in cylindrical coordinate are considered. The mean flow fields are obtained from large-eddy simulations. An impulse response analysis of the linearised system is performed which allows a wide range of frequencies to be excited. The transfer function at the nozzle-lip is used to characterise the receptivity process. The sensitivity of the transfer function to the pulse location and the azimuthal wave number is performed. It ..View full abstract
This work was supported by the Australian Research Council. The research benefited from computational resources provided through the National Computational Merit Allocation Scheme, supported by the Australian Government. The computational facilities supporting this project included the Australian NCI Facility, the partner share of the NCI facility provided by Monash University through an ARC LIEF grant, Pawsey Supercomputing Centre and the Multi-modal Australian ScienceS Imaging and Visualisation Environment (MASSIVE).