[Plaschko]

For fluent experts: Steady flow over a cylinder
Hello everybody, I am new in Fluent flow. I used a geometry with two concentric cylinders D1=5m, D2=64m. I do not know what means frozen and needed extruded cylinders to activate the Boolean subtraction. "Surface from Sketches" : did not work.
I used the circles with identical depth (20 m) and I tried to apply the ittle cyl. (the solid cylinder with add material, Tool Body) and used the outer one (to simulate the flow field as frozen, Target Body), The Boolean subtraction was active but the face selection filters did not work (not active).
Thank you for help , Peter