ARTIFICIAL BOUNDARIES AND FLUX AND PRESSURE CONDITIONS FOR THE INCOMPRESSIBLE NAVIER-STOKES EQUATIONS

Fluid dynamical problems are often conceptualized in unbounded domains . However, most methods of numerical simulation then require a truncat ion of the conceptual domain to a bounded one, thereby introducing art ificial boundaries. Here we analyse our experience in choosing artific ial boundary conditions implicitly through the choice of variational f ormulations. We deal particularly with a class of problems that involv e the prescription of pressure drops and/or net flux conditions.