Coherent structures in turbulent mixed convection flows through channels with differentially heated walls

The occurrence and shape of turbulent structures in mixed convection flows through a differently heated vertical channel are investigated terms thermally induced attenuation amplification velocity, pressure, temperature fluctuations using direct numerical simulations. It is shown that the wall-normal momentum transport decreased increased near cooled wall, respectively, this leads to reduced elevated production velocity streamwise component aiding opposing flow, respectively. corresponding flow smoother, faster warmer aligned along main while colder more frayed less directed. overall stable than flow. Besides, study reveals position maximum moves toward so sweeps produced at two walls affected by former. As consequence, distance time period over which develop shorter further vortex oriented direction usually arise with an offset right or left above sweep ejection, whereby decreasing values correlation coefficients increasing Grashof number indicate weakening structures. Since none evaluated criteria, is, distributions vorticity, λ 2 - value Rortex-value correlate well minima pressure fluctuations, they do not allow clear identification Finally, analyzing budget kinetic energy it confirmed only indirectly influenced buoyancy force. Thus, reflected reduction exaggeration Reynolds shear stresses