Fixed an issue with normal vector not being norm unit, which was causing

reflected particle velocities to increase.

src/modules/mesh/2DCyl/moduleMesh2DCyl.f90

@@ -194,6 +194,7 @@ MODULE moduleMesh2DCyl
       self%normal = (/ self%r(2)-self%r(1), &
                        self%z(2)-self%z(1), &
                        0.D0 /)
+      self%normal = self%normal/NORM2(self%normal)
       !Boundary index
       self%boundary => boundary(bt)
       ALLOCATE(self%fboundary(1:nSpecies))