Energy and spectral dynamics in forced compressible turbulence
Abstract
Numerical simulations are used to study compressible turbulence with microscale Reynolds numbers up to 40 and rms Mach numbers M up to 0.9. The flows are randomly forced, with energy supplied to either the rotational or compressive components of kinetic energy, which is then transferred to internal energy through the pressuredilatation interaction and viscous dissipation terms. Coupling between the two components of kinetic energy by the advection term is relatively weak, and most energy introduced to either component by the external force is transferred, without passing through the other component, to internal energy. A statistically quasiequilibrium of kinetic energy is realized while internal energy increases steadily. The spectral form of the rotational component of velocity, which hardly depends on M, is very close to that for incompressible flow. On the other hand, the compressive component depends strongly on M, especially at large wave numbers.
 Publication:

Journal of Scientific Computing
 Pub Date:
 June 1990
 Bibcode:
 1990JSCom...5...85K
 Keywords:

 Compressible Flow;
 Computerized Simulation;
 Energy Transfer;
 Flow Characteristics;
 Turbulent Flow;
 Computational Fluid Dynamics;
 Energy Spectra;
 Flow Distribution;
 Incompressible Flow;
 Kinetic Energy;
 Fluid Mechanics and Heat Transfer