Toward a High Resolution Real Gas Finite Volume Solver with Multi Optimal Order Detection

orc2019 Tracking Number 178

The accurate predictions of the ORC expander performance rely on validated numerical tools that take into account the full complexity of the underlying physics. The expansion of organic vapor in turbomachines rotor and stator features non-ideal gas behavior with chocked flow in transonic conditions and supersonic expansion. In this paper, a finite volume solver using moving least squares approximations for higher order reconstruction is used. The real gas properties are taken into account using lookup tables with Tabular Taylor Series Expansion. The SLAU approximate Riemann solver is used for its compatibility with real gas computations. The conventional/classical slope limiter approach to handle shocks is replaced with the a posteriori paradigm for the local order reduction (MOOD). The developments are validated by comparing available solution of supersonic expansion of R245fa in a converging diverging nozzle test case.%ideal gas then real Further developments will focus on the CFD of turbulent non ideal dense gas expansions with implicit large eddy scale techniques using MOOD and automatic dissipation adjustment (ADA) for turbomachinery applications.