Momentum and heat flux events in compressible turbulent channel flows
Cheng Cheng, Wei Shyy, Lin Fu
Abstract
The present study investigates the momentum and heat fluxes in subsonic/supersonic channel flows. By employing the spectral linear stochastic estimation, the near-wall fluxes are decomposed into large and small-scale components, and the logarithmic-region fluxes are decomposed into active and inactive parts, respectively. The findings of the present study demonstrate that the generation of the extreme events of the heat and momentum transfers in the near-wall region should be ascribed to the near-wall small-scale flow, and both the inactive and active components contribute to the mean fluxes in the logarithmic region.
Topics & Concepts
Momentum (technical analysis)TurbulenceSupersonic speedHeat fluxMechanicsPhysicsCompressibilityFlux (metallurgy)LogarithmChannel (broadcasting)Flow (mathematics)Open-channel flowScale (ratio)Heat transferMaterials scienceMathematicsMathematical analysisMetallurgyEconomicsQuantum mechanicsElectrical engineeringEngineeringFinanceFluid Dynamics and Turbulent FlowsComputational Fluid Dynamics and AerodynamicsCombustion and flame dynamics