Wave-packet modulation in shock-containing jets
Petrônio A. S. Nogueira, Hamish W. A. Self, Aaron Towne, Daniel Edgington-Mitchell
Abstract
We propose a new reduced-order approach to predict the modulation of wavepackets in shock-containing jets, based on the Floquet ansatz. Good agreement is observed between the wavepackets predicted by the method and the most energetic modes extracted from a numerical simulation, suggesting that the method is able to capture the underlying physical mechanism associated with wavepacket modulation: the extraction of energy from the mean flow by the Kelvin-Helmholtz mode and a redistribution of energy to modulation wavenumbers due to the interaction of this mode with the shock-cell structure.
Topics & Concepts
Modulation (music)PhysicsAnsatzWave packetShock waveFloquet theoryMechanicsShock (circulatory)Computational physicsAcousticsAtomic physicsQuantum mechanicsInternal medicineNonlinear systemMedicineCombustion and flame dynamicsAerodynamics and Acoustics in Jet FlowsFluid Dynamics and Turbulent Flows