Square Cylinder Large Eddy Simulation Based on Random Inlet Boundary Condition

Due to the geometrical similarity to many engineering structures, the flow characteristics around the square cylinder have been studied for some time using the experimental or computational fluid dynamics (cfd) technique. however in the past research the inlet boundary is assumed to be steady for simplifying the simulation model, which is conflict with real flow field. to overcome such problem, in this paper, the time varying inlet boundary condition based on autoregressive moving average (arma) model is proposed, based on which this inlet boundary generation procedure is introduced. to study the flow characteristics around the square cylinder, a 2d large eddy simulation procedure numerical description is introduced, and different turbulence intensity will be considered at the inlet boundary. the general aerodynamic parameters such as lift coefficient and drag coefficient and velocity component time averaged values along the centre line of the computational domain are discussed. to study the aerodynamic parameters in the frequency domain, the velocity spectrum at different position around the square cylinder will be discussed.