doi: 10.1685/journal.caim.394

Ghost cell boundary conditions for the Euler Equations and their relationships with feedback control

Andrea Villa, Luca Barbieri, Roberto Malgesini

Abstract


Computational gasdynamics finds many applications in engineering ranging from the optimization of rocket nozzles to the study of airfoils. As a consequence, the numerical solution of the Euler equations using the finite volume method is very popular as a standard computing tool. One of the most tricky aspects in this kind of simulations is the imposition of the boundary conditions. Many approaches exist to tackle this problem and the ghost cell technique is one of the most applicable ones. In particular, this technique has already been used to enforce the wall boundary condition. In this paper the ghost cell technique is used to impose different boundary conditions such as the inflow, the pressure and the temperature ones. The merits of this technique are compared to other approaches and it is proved, under some simplifying hypotheses, that the ghost cell technique can be regarded as a local proportional feedback control. The stability and the performances of the control loop are investigated as well.

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Communications in Applied and Industrial Mathematics
ISSN: 2038-0909