Once you have exited the modeling window, initiate the meshing process by clicking on Mesh in the workflow.
Set Mesh Size and Boundary Layer
Use a medium-high setting on the Mesh resolution slider. This will automatically adjust the mesh settings for our needs.
Change the view to Translucent display using the view dropdown selection in the upper region of the window. AIM will prompt you to fix the boundary layer before generating the mesh. Click on Boundary Layer under Mesh Controls. The boundary layer will be applied to the face of the cylinder inside of the flow volume.
Return to the Mesh panel, then click Generate Mesh under Output or at the top of the screen by the status window for Mesh. AIM should detect that you are ready to generate the mesh and highlight the buttons in blue.