Numerical modeling of flow through orifice meters
Abstract
Numerical modeling is performed for turbulent flow through orifice meters using Creare's computer program FLUENT. FLUENT solves the time averaged NavierStokes equations in 2D and 3D Cartesian or cylindrical coordinates. Turbulence is simulated using a two equation kepsilon or algebraic stress turbulence model. It is shown that an 80 x 60 grid distribution is sufficient to resolve the flow field around the orifice. The variations in discharge coefficient are studied as a result of variation in beta ratio, Reynolds number, upstream and downstream boundary conditions, pipe surface roughness, and upstream swirl. The effects of beta ratio and Reynolds number on the discharge coefficient are shown to be similar to the experimental data. It is also shown that the surface roughness can increase the discharge coefficient by about 0.7 percent for the range of roughness heights encountered in practice. The numerical modeling approach would be most effective if it is combined with a systematic experimental program that can supply the necessary boundary conditions. It is recommended that numerical modeling be used for the study of other flow meters.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 March 1988
 Bibcode:
 1988STIN...8912005S
 Keywords:

 Computer Programs;
 Flowmeters;
 KEpsilon Turbulence Model;
 NavierStokes Equation;
 Turbulent Flow;
 Boundary Conditions;
 Boundary Value Problems;
 Cartesian Coordinates;
 Computational Grids;
 Flow Distribution;
 Fluid Mechanics and Heat Transfer