الفهرس 
Direct operated regulators
MATHEMATICAL MODEL AND NUMERICAL METHODOnly 14 pages are availabe for public view
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Abstract
The Axial Flow Valve (AFV) is a flexible element valve designed to control pressure in gas pipeline. The AFV has an elastic sleeve which deforms depending on the differential pressure across it. The current study aims to simulate the gas flow inside AFV numerically using Computational Fluid Dynamics (CFD) to study the pressure reduction and energy dissipation inside AFV.
The basic theory and governing equations of CFD are explained, and different turbulence modelling techniques are presented. Three-dimensional CFD model for gas flow inside AFV is presented. The dynamic response of the elastic element was simulated using 2-way Fluid Structure Interaction (FSI) technique. The compressible form of Navier–Stokes equations with the standard RNG variant of k–ε model of turbulence have been solved for this purpose using ANSYS-FLUENT package.
After establishing a verified mathematical model, the numerical results are validated by comparison with the published valve data found in the literature. The model successfully predicts the motion of the elastic element under different values of the control pressure and flow conditions. The design of the cage opening is improved to study the effect of the cage slots shape on valve performance. The modified design successfully reduced the energy loss inside the valve.