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Increasing computational power to price ratio pushes the interest in simulations in the field of agricultural machinery. Simulations offer fine control over system parameters and provide great insight in the processes which contribute beneficial information in the optimization of agricultural machinery. This thesis focusses on the realisation of representative Discrete Element Method simulations of straw interacting with the rotor and pre-compression chamber of a large square baler. Preparatory experiments were conducted in order to correctly asses the necessary straw properties and simulation settings. Simulations of the baler were vali- dated with experiments on a baler, which was modified to resemble the setup used for the simulations. Rotor torque and video footage were used to validate the simulations. Results showed that the used straw model is able to reproduce the crop ow in the pre-compression chamber correctly. Simulated rotor torque resembles the mea- sured torque in shape and order of magnitude. Simulations are currently not accurate enough to engage in machine optimization though a solid foundation for further work is laid.