Internal combustion engines have been in use for about two centuries. The fuel efficiency of conventional compression ignition engine is superior to conventional spark ignition engine. The diesel-fueled compression engine is meeting the requirement of prime mover in applications. The diesel engines have undergone multitude of design modifications. Diesel-fueled engines’ particulate and oxides of nitrogen (NOx) emissions are high. Of late, research community is perplexed with the tackling of fuel efficiency and lower exhaust emissions. Low-temperature combustion has shown promising results with lower emissions and better efficiency. Reactivity-controlled compression ignition engine has shown promising results to continue for the sustenance of combustion engines. The new concept engine operates with two types of fuel: low reactivity and high reactivity fuels. With proper fuel selection, this concept could facilitate the use of renewable energy sources. Numerical simulations with ANSYS-Forte using hydrogen, as low reactivity fuel, in varying proportions along with petrodiesel as high reactivity fuel. For a chosen engine configuration, pressure-crank and heat release rate diagrams along with NOx and carbon monoxide (CO) emissions have been predicted. The results indicated that with increase in amount, both rate of heat release and NOx emissions increased, whereas CO emissions decreased.