The aim of this paper is to carry out a group of numerical experiments over the fluid flow through the valve reed, using the CFD&HT code TermoFluids, a new unstructured and parallel object-oriented CFD code for accurate and reliable solving of industrial flows. In all studied cases a multi-dimensional explicit finite volume fractional-step based algorithm has been used with symmetry preserving discretization scheme. When turbulence modelling is needed, an extension of the Yoshizawa non-equilibrium fixed-parameter subgrid-scale model to structures meshes is used. The pressure equation is solved by means of parallel Fourier Schur decomposition solver which is an efficient direct solver for loosely coupled PC cluster. In fact, the fluid flow is analysed by two parallel phenomena (an entrance flow through a channel and a free jet through a surface). IN that sense, the present paper is focused on the numerical simulation model of the fluid flow through the valve reeds, considering a simplified geometry of an axial hole plus a radial diffuser.The numerical results presented are based on a specific geometry - orifice diameter d is 3 times valve reed diameter D- together with a wide range of boundary conditions: different Reynolds number at the entrance and different valve displacement s vs. orifice diameter d. The studied cases vary from laminar to turbulent flow, almost to be considered incompresible and lower supersonic conditions and/or chocked flow.

Peer Reviewed