[Ahmed8]

Hi,

I'm fairly new to Ansys Fluent and I'm trying to simulate the flow around a 3D cylinder at Re = 300. All models are turned off except viscous model I'm using laminar model.

My domain dimensions are 20m from the inlet to the cylinder axis, 30m from the outlet to the cylinder axis, 20m from the bottom and top wall and 12m on the z direction. the cylinder has a diameter of 1m and a spanwise length of 12m.

My boundary conditions are velocity inlet at the inlet v = 0.00438 m/s, pressure-outlet at the outlet, no-slip boundary condition is imposed on the cylinder, for the top and bottom walls I specified a shear condition with shear stress at all component equal to 0. For the walls on spanwise (z-axis) direction I tried creatin a periodic boundary condition but I'm not sure if I did it right.

My Cd values seems to remain the same whether I create a periodic boundary condition or not and the average Cd is very high giving me a value of about 11

Kindly please help me resolve this.