We study the impact of sub-core scale heterogeneity on meter-scale flow by conducting high resolution numerical simulations using data obtained in coreflooding experiments. Saturation distributions at steady state show that the experimental data is mostly governed by capillary end effects. Furthermore, gravity effects are observed only on larger scale flows. Two types of capillary entry pressure trapping mechanisms are identified and different statistical parameters of permeability (variance and correlation) are shown to impact these mechanisms.