Large-scale motions and self-similar structures in compressible turbulent channel flows
Cheng Cheng, Lin Fu
Abstract
The present study investigates the scale characteristics of the log- and outer-region motions and structures in subsonic and supersonic wall turbulence. The energy distribution among the multiscale structures in the outer region is found to be dominated by the semilocal friction-Reynolds-number effects rather than the Mach-number effects. The geometrical characteristics of the self-similar structures populating the logarithmic region are also revealed by adopting a linear coherence spectrum.
Topics & Concepts
TurbulenceSupersonic speedReynolds numberPhysicsMach numberMechanicsScale (ratio)CompressibilityClassical mechanicsLogarithmScalingStatistical physicsGeometryMathematicsMathematical analysisQuantum mechanicsFluid Dynamics and Turbulent FlowsComputational Fluid Dynamics and AerodynamicsParticle Dynamics in Fluid Flows