Sizing of Safety Valves Using ANSYS CFX‐Flo^®

Abstract

This work discusses the effect of the degree of fineness of the flow volume discretization and that of the turbulence model on the accuracy of reproduction of air mass flow rates in two safety valves using the CFD software ANSYS Flo ® . Calculations show that the degree of fineness of the discretization is the decisive factor affecting the exactness of the calculations and that the best reproduction is achieved with grids where at least two cells are built on the smallest edge. The selection of the turbulence model has by far in comparison a lower impact; however, the best accuracy is obtained using the standard k-x model and the SST modification of Menter.

A CFD analysis of the dynamics of a direct-operated safety relief valve mounted on a pressure vessel

“…From the 90's, with the development of computational methods, the computational analysis of the complex flows through valves have became more feasible thus leading to substantial research into the operation and design of SRVs [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. For example, Vu and Wang [1] investigated the complex three-dimensional flow field of an oxygen SRV during an incident with CFD (computational fluid dynamics) techniques.…”

A Computational Investigation on the Flow of Non‐Newtonian Polymers in Safety Valves

“…This grid contains more than 1.4 million elements, of which 85 % are tetrahedral cells. A similar grid has been described in a previous publication [12]; however, the original grid also had three layers of prisms in contact with the metal surface of the valve for near-wall treatment and a finer resolution in the slit between the seat and the disk. It must be proven that the elements of the coarse grid in Fig.…”

Advanced Temperature-Control Chamber for Resistance Standards

“…After the three-dimensional (3D) model of the inner chamber was designed, ANSYS software was used to simulate the air flow of input and output fans [8][9][10][11][12][13][14][15]. Starting with the fundamental Navier-Stokes equation, physical processes like heat, momentum, and mass transfer can be characterized, with ρ, v, P, τ, and g being the air density, air velocity, air pressure, stress tensor (representing air viscosity), and Earth's gravity, respectively:…”