Turnaround radius of galaxy clusters in N-body simulations Giorgos Korkidis, Vasiliki Pavlidou, Konstantinos Tassis, Evangelia Ntormousi, Theodore N. Tomaras and Konstantinos Kovlakas A&A, 639 (2020) A122 Published online: 20 July 2020 DOI: 10.1051/0004-6361/201937337