The main objective of this analysis is to determine the measurement error in Flare Gas Ultrasonic meter installations using CFD tool.
The flow was assumed to be steady and incompressible throughout. The realizable k-turbulence model was used in most cases The CFD modeling of the ultrasonic meter was undertaken in three separate stages:
Analysis of the bend and baseline models has been run in order to generate the inlet boundary conditions for the meter model at each given flow rate.
The CFD simulations agreed well with the test data for the diametric path position and predicted the correct trend with distance from the bend. The predictions were within 2 - 6% of the measurements in all cases.
A single bend generates an asymmetric flow profile that also has non-axial velocity components present. The curvature of the bend causes the flow to be thrown to the outside of the pipe creating a skewed velocity profile which will then slowly develop down the pipe.