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An added-mass free semi-implicit coupling scheme for uid-structure interaction Matteo Astorino y Franz Chouly z Miguel A. Fernandez x We propose a semi-implicit coupling scheme for the numerical simulation of uid-structure interaction systems involving a viscous incompressible uid. The scheme is stable irrespectively of the so-called added-mass eect ( uid and solid densities which are close and/or domain which is slender) [5]. Moreover, it allows for conservative time-stepping within the structure. The eciency of the scheme is based on the explicit splitting of the viscous eects and geometrical/convective non-linearities, through the use of the Chorin-Temam projection scheme within the uid [6]. Stability relies on the implicit treatment of the pressure stresses and on the Nitsche's treatment of the viscous coupling [2,3,4]. The numerical stability of the scheme is proved theoretically through a priori energy estimation [1]. Numerical results in two and three dimensions illustrate the stability and eciency of the scheme as well as its potentiality in the context of blood ow simulations [7]