This paper presents a United Atom (UA) force field for simulating hydrocarbon molecules in bituminous materials. integrating explicit hydrogens into beads with their parent atom. This method simplifies all-atom molecular models. significantly accelerating Molecular Dynamics (MD) simulations of bitumen by 10 to 100 times. https://www.roneverhart.com/MagnaFlow-2007-2008-Mitsubishi-Outlander-OEM-Grade-Federal-EPA-Compliant-Manifold-Catalytic-Converter/