GS12 Influence of Adiabatic-Wall Arrangement on Compressible Turbulent Flows through a Square Duct

In this study, the direct numerical simulation (DNS) of compressible turbulent flows through the square duct with several arrangement patterns of the adiabatic walls is performed and the flow fields are investigated. The friction of the adiabatic wall decreases and the flow near the adiabatic wall is stabilized. The drastic change of the secondary flow in comparison with the incompressible one occurs only in the case of one adiabatic wall. The arrangement patterns of the adiabatic walls have an influence on the distribution of mean quantities. From the results of instantaneous fields, the vortex structures are inactivated in the case of three adiabatic walls.