2026/01/31 by Hridey Narula, Prasad Perlekar
Engineering · #Particle Dynamics in Fluid Flows #Fluid Dynamics and Mixing #Fluid Dynamics and Turbulent Flows
paper · pdf · doi:10.1209/0295-5075/ae8ea9
Abstract Energy transfer in turbulent flows is typically described either through correlation functions, via the Kármán–Howarth–Monin relation, or through a scale-by-scale budget of the filtered energy (Frisch 1995). For constant-density homogeneous and isotropic turbulence, the equivalence between these two descriptions is well understood.
In compressible turbulence, however, several definitions of filtered energy exist, and for most definitions the associated formulation in terms of correlation functions is unclear.
We develop a general empirical framework, supported by theoretical arguments and numerical simulations, to determine the multipoint correlation functions corresponding to any filtered energy.
We then show that the Favre filtered energy -- defined as the ratio of the squared filtered momentum to the filtered density -- corresponds to an infinite series of multipoint correlation functions.
This is achieved by expanding the Favre velocity as a power series in local density fluctuations.
The expansion reveals the contributions of the subgrid-scale fluctuations of velocity and density to the Favre velocity.
We verify the proposed expansion for the buoyancy and pressure contributions for three-dimensional buoyancy-driven bubbly flows with a large density contrast (102) between the liquid and the bubble phase.