We carry out DNS of pipe flow rotating about an axis orthogonal to the axial direction. Rotation leads to the onset of Coriolis Forces which break the flow symmetry. The flow is controlled by the rotation number, namely \(Ro = \Omega R/u_b\), where \(R\) is the pipe radius, \(\Omega\) is the angular velocity, and \(u_b\) the bulk flow velocity. As \(Ro\) increases, turbulence becomes intensified on the pressure side, and it becomes suppressed on the suction side, with possible relaminarization. At high \(Ro\) the flow organizes into Taylor-Proudman columns, and turbulence becomes confined to thin Ekman layers. This flow is representative of cooling channels in aeroengines, in which accurate prediction of pressure drop and heat transfer is critical.