The AMG solver runs fine for the 2D tutorial-cases provided for pUCoupledFoam.
But I found that the AMG solver does not work with pUcoupledFoam when a 3D case is used. I tried with the motorBike example and the cavity example with additional grid cells in z-direction (attached).
Both cases run fine with BiCGStab.
Additionally the solver statistics are missing for Up in pUCoupledFoam.
I checked both releases (foam-extend-3.1, foam-extend-3.2).
Regards, Markus.