Numerical Simulation of the Heat-Fluid Flow Behavior Around the Cylinder with the Controller Wire

In this paper, the effects of tripwire in upstream of flow over a circular cylinder in a 2D channel and Re=100 has been investigated. The dimensions of the channel are 20D×50D. The distance between cylinder and wire is considered from 1.5D to 6D, and the relative size of wire is considered from 0.1D to 0.9D. The governing equations are continuity, momentum, and energy for 2D, incompressible, unsteady and vicious conditions. The no-slip condition for both cylinder wall, constant temperature for cylinder, and adiabatic wall for wire have been considered in this paper. The followed equations have been solved by the back-ward differentiate method and the CFD software - COMSOL MULTYPHISIC. The results show that the higher diameter of the wire and horizontal and vertical distances of the wire causes a higher decrease in values of cylinder’s drag and heat transfer. At all, It is found that existing of wire in upstream, decreases the drag and heat transfer of the cylinder but oscillating wire with the amplitude of 0.25D and relative distance and diameters of 3D and.3D causes increasing in discussed parameters relative to the stationary state of them.