Modern theory of turbulence cone valve flow pattern pool stilling basin theoretical analysis

The current status of numerical simulation calculation and application of modern theory of turbulence cone valve flow pattern pool stilling basin theoretical analysis of the stilling basin axis longitudinal section of a mathematical model: a mathematical model for the above discrete finite volume method obtain discrete equations:  Stainless steel needle valve  using the above ADI method, combined with under-relaxation iterative solution of the momentum equations take the relaxation factor 0.5, turbulent kinetic energy, turbulent dissipation rate equation relaxation factor of 0.4; calculation of the pressure field using pressure correction France,  Instrument valve manifolds  factor of 0.8; staggered grid computing grid; solid wall conditions as a function of the rate of a given wall; free surface assuming volatility is not, press the "rigid lid" hypothetical treatment; downstream outlet assumes that the turbulence has reached the autocorrelation balance. Calculation process, according to the conical valve stilling basin own characteristics, diffusion and source terms were also owe relaxation, diffusion and relaxation factor source terms are taken as 0.5.