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Most stars are born in clusters, and many stars are born with companions. Recent observations of young stars are finding more evidence of stellar interactions and accretion streams perturbing their protoplanetary discs, potentially leading to accretion bursts, disc truncation, and fragmentation. In this project, the student will use 3D magnetohydrodynamical simulations to model accretion streams impacting a protoplanetary disc around a young star to study how the disc responds. There is ample opportunity to expand the project by adding more physics or by testing various accretion-stream parameters. I will work with prospective students to build a project that aligns with your strengths and interests.