Accounting for Real Media Properties in Numerical Simulation of Hydraulic Testing of Tubing Pipes

– The paper discusses the development of approaches to numerical simulation of unplanned situations during hydraulic testing of tubing pipes. A process of unsteady outflow of high-pressure hot water from a crack on the surface of a tubing pipe is considered. For numerical study of jet dynamics and its interaction with a test box structure, the information on time variation of the working medium pressure and temperature in the pipe is required. For this purpose, a mathematical model was proposed and implemented, which accounts for change in medium properties at unsteady outflow of high-pressure hot water from the crack on the surface of a tubing pipe. A differential equation of pressure change in the tubing pipe, resulting from sequential application of mass and energy balance equations and the Tate equation of state, made it possible to estimate the pressure change in the test box over time and to form boundary conditions for estimation of the hydrodynamic force acting on the cover of the test box. To estimate the hydrodynamic force of the jet, tools of numerical simulation were used. A numerical solution of the problem of working medium outflow from a crack in a tubing pipe has been constructed using the OpenFOAM free software. The paper presents a developed and implemented approach to numerical simulation of unplanned situations during hydraulic testing of tubing pipes..