Construct a laminar straight pipe flow using Ansys CFD software. Conduct a comparison between the computational fluid dynamics $($CFD$)$ predictions for this scenario and the anticipated outcomes based on classical theory. The classical theory assumes a fully developed flow with a parabolic velocity profile, known entrance length, and a known pressure drop per unit length. It can be assumed that the velocity profile at the intake to the pipe is uniform. When doing your study, employ multiple meshes for the problem to guarantee that your conclusions are not influenced by the specific mesh used. Ensure that your report incorporates visual representations of the mesh and provides a detailed analysis of the specific configurations employed.