A kinetic scheme for unsteady pressurised flows in closed water pipes
It provides a new numerical method for transient flow simulations in water pipes, but the validation is limited to a single test case and the improvement over existing methods is not quantified.
The paper presents a kinetic numerical scheme for simulating transient pressurised flows in closed water pipes, validated against an industrial code for a water hammer case, showing very good agreement.
The aim of this paper is to present a kinetic numerical scheme for the computations of transient pressurised flows in closed water pipes. Firstly, we detail the mathematical model written as a conservative hyperbolic partial differentiel system of equations, and the we recall how to obtain the corresponding kinetic formulation. Then we build the kinetic scheme ensuring an upwinding of the source term due to the topography performed in a close manner described by Perthame et al. using an energetic balance at microscopic level for the Shallow Water equations. The validation is lastly performed in the case of a water hammer in a uniform pipe: we compare the numerical results provided by an industrial code used at EDF-CIH (France), which solves the Allievi equation (the commonly used equation for pressurised flows in pipes) by the method of characteristics, with those of the kinetic scheme. It appears that they are in a very good agreement.