The mechanical properties of injection molded, fiber reinforced composites are highly dependent on the fiber orientation developed during processing. For this it is important to be able to predict the fiber orientation that develops during processing. Recently, a modified version of the Folgar-Tucker model, the reduced strain closure (RSC) model has been shown to better predict the slow-down in evolution of fiber orientation observed in start-up of shear flows. Also in injection molding flows, predictions of the RSC model agrees better with measured orientation data. Experimental data, however, is only available in the lubrication region, in which the orientation has reached a steady value. We investigate the fiber orientation in the entrance and frontal regions, in which the fiber orientation does evolve. Flow simulations in a center-gated disk were performed for the Folgar-Tucker and RSC model using a finite element method. Both frontal flow and nonisothermal effects were considered, which govern the orientation of fibers near the walls. Model predictions were assessed against orientation measurements along the entire flow length, at three different heights representative of the shell, transition, and core layer, respectively. Interestingly, we found that in the transition and core layers, the fiber orientation evolves considerably faster than both models predict. In these region, where the flow consists of a mixture of shear and extension, a speed-up of evolution would be necessary to predict the measured fiber orientation data.