Inflow turbulence generation using an equivalent boundary layer model

Eddy-resolved simulation of external flow usually requires inflow boundary conditions representing a turbulent layer (TBL) flow, and the quality fluctuation directly impact accuracy cost simulation. The present study proposes new method to generate TBL turbulence, i.e., equivalent (EBL) model. Based on open-channel model, EBL approximates at given Reynolds number by recovering mean momentum balance with driving force. It simulates streamwise homogeneous applying periodic and, thus, overcomes complexity artificiality incurred classic recycling–rescaling methods. current paper discusses difference between channel flows from equation point view designs force corresponding inertial layer. Also, total shear stress models for obtaining are validated both priori posteriori. Direct numerical simulations (DNS) carried out EBLs Reθ=1000,1420, 2000 (where Reθ is based thickness), showing that model well reflects statistical characteristics numbers. application generation turbulence also demonstrated DNS layers inlet 2000. computational results agree generally acknowledged data published in literature, terms developing statistics, profiles energy spectra characteristic cross sections. Judging velocity, adjustment section shorter than one thickness.