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).

I hope you can get me a hand with this problem. Thank you, Peter

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