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Numerical modeling has been widely used for many years in the design, optimization, and manufacturing of complex technical systems in various industries. New challenges posed to internal combustion engines require a fresh approach and the application of modern simulation methods. This study focuses on the numerical analysis of the co-combustion process of diesel fuel with butyl alcohol in a dual-fuel, self-ignition internal combustion engine based on a three-dimensional engine model developed in AVL Fire software. The influence of butanol content, ranging from 0 to 60%, on engine performance and emissions was investigated. Calculations were conducted for constant engine speed and constant energy dose of fuel supplied to the engine. Increasing the amount of butyl alcohol burned with diesel fuel leads to a delay in ignition, decreases maximum cylinder pressure and temperature, and increases the rate of pressure rise and heat release rate. For alcohol content of 20% and 40%, there is an increase in pressure and indicated power compared to diesel fuel alone. The addition of butanol to diesel fuel reduces the specific emissions of nitrogen oxides and soot in the dual-fuel engine. The most favorable case was with a 40% butanol content. For DB40, the highest IMEP (0.69 MPa) and N_i (10.37 kW) values were obtained, along with the highest TE efficiency (43.64%). In comparison to D100, lower NO and soot emissions were achieved for this case, by 35% and 65% respectively.