Assessment of Engineering Turbulence Models in Buoyant Diabatic Turbulent Flow

Turbulent heat transfer in buoyancy-dominated flows is a challenging problem for computational fluid dynamics (CFD). Many authors attribute model error these conditions to the Reynolds analogy. We leverage brand-new direct numerical simulation database evaluate performance of several popular turbulence models buoyant diabatic channel flow. find that results are relatively accurate, with Nusselt number less than 20%. However, turbulent flow solution very inaccurate, wall shear overpredicted by up 100%. This indicates significant such flows. determined dominant sources missing physics algebraic stress framework and simple buoyancy production term used industrial CFD. suggest future modeling efforts focus on two error. demonstrate analogy not source