Browsing USN Open Archive by Author "Welahettige, Prasanna Kumara Welahetti"
Now showing items 1-12 of 12
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A solution method for one-dimensional shallow water equations using flux limiter centered scheme for open Venturi channels
Welahettige, Prasanna Kumara Welahetti; Vågsæther, Knut; Lie, Bernt (Journal article; Peer reviewed, 2018)The one-dimensional shallow water equations were modified for a Venturi contraction and expansion in a rectangular open channel to achieve more accurate results than with the conventional one-dimensional shallow water ... -
Comparison of OpenFoam and ANSYS Fluent. Compitational Fluid Dynamic Simulation of Gas-Gas Single Phase Mixing with and without Static Mixer
Welahettige, Prasanna Kumara Welahetti; Vågsæther, Knut (Chapter; Peer reviewed, 2016)Gas-gas single phase mixing were numerically evaluated with static mixer and without static mixer using OpenFoam and ANSYS Fluent codes. The main goal was the gas-gas mixing simulation comparison between ANSYS Fluent and ... -
Computational fluid dynamics study of flow depth in an open Venturi channel for Newtonian fluid
Welahettige, Prasanna Kumara Welahetti; Lie, Bernt; Vågsæther, Knut (Journal article; Peer reviewed, 2017)Open Venturi channel flow measurement could be a cheap method to be used in drill bit pressure control. The main objective of this study is to identify the factors related with the flow depth in an open Venturi channel. A ... -
Computational Fluid Dynamics Study of Shear Thinning Fluid (Drilling Fluid) Viscosity Models in an Open Venturi Channel
Welahettige, Prasanna Kumara Welahetti; Lie, Bernt; Vågsæther, Knut (Journal article; Peer reviewed, 2019)We aim to develop an improved kick/loss detection technology by developing smart flow-sensor technology for returned flow from the oil well in open Venturi channels. This is a detailed study about a capacity of use of ... -
Computational Fluid Dynamics Study of the Effects of Drill Cuttings on the Open Channel Flow
Welahettige, Prasanna Kumara Welahetti; Berg, Christian; Lundberg, Joachim; Lie, Bernt; Vågsæther, Knut (Peer reviewed; Journal article, 2019)A three-dimensional computational fluid dynamics (CFD) study was carried out for drilling fluid flow with drill cuttings in open channels. The flow is similar to the return flow when drilling, stream containing drilling ... -
Euler-Granular Approach for Modelling of Dilute Phase Pneumatic Conveying in a Vertical Pipe
Welahettige, Prasanna Kumara Welahetti; Ariyaratne, W. K. Hiromi; Melaaen, Morten Christian (Journal article; Peer reviewed, 2017)In the present study, vertically upward dilute phase pneumatic conveying flow was predicted using Euler - Granular method. Three dimensional computational fluid dynamics simulations were carried out for an 8 m long and ... -
Flow regime changes at hydraulic jumps in an open Venturi channel for Newtonian fluid
Welahettige, Prasanna Kumara Welahetti; Lie, Bernt; Vågsæther, Knut (Journal article; Peer reviewed, 2017) -
Model Based Early Kick/Loss Detection and Attenuation with Topside Sensing in Managed Pressure Drilling
Jinasena, Asanthi; Holta, Haavard H. F.; Jondahl, Morten Hansen; Welahettige, Prasanna Kumara Welahetti; Aamo, Ole Morten; Sharma, Roshan; Viumdal, Håkon; Lie, Bernt (Peer reviewed; Journal article, 2020)Early kick/loss detection is a crucial part of safe well control, and it plays a major role in the reduction of risk and non-productive time in drilling. In conventional drilling, topside sensing is used for early kick/loss ... -
One-dimensional model of turbulent flow of non-Newtonian drilling mud in non-prismatic channels
Welahettige, Prasanna Kumara Welahetti; Lundberg, Joachim; Bjerketvedt, Dag; Lie, Bernt; Vågsæther, Knut (Peer reviewed; Journal article, 2019)One-dimensional model of non-Newtonian turbulent flow in a non-prismatic channel is challenging due to the difficulty of accurately accounting for flow properties in the 1-D model. In this study, we model the 1-D Saint–Venant ... -
A Real-Time Flow-Measuring Algorithm for Open Venturi Channel Non-Newtonian Flow
Welahettige, Prasanna Kumara Welahetti; Lie, Bernt; Vågsæther, Knut (Peer reviewed; Journal article, 2019)A real-time flow measuring algorithm is developed for the open Venturi channel non-Newtonian flow measurement. Using a single level sensor reading at downstream of the open Venturi channel, a drilling-well return flow rate ... -
Study of Fluidization Regimes using OpenFOAM Computational Fluid Dynamics
Welahettige, Prasanna Kumara Welahetti; Lie, Bernt; Vågsæther, Knut; Moldestad, Britt Margrethe Emilie (Journal article; Peer reviewed, 2017)The objective of this study was using computational fluid dynamics simulation with OpenFOAM to study the fluidization properties for four types of particles classified as Geldart A, B, C and D. Fluidization regimes were ... -
Transient drilling fluid flow in Venturi channels: comparing 3D and 1D models to experimental data
Welahettige, Prasanna Kumara Welahetti (Doctoral dissertations at the University of South-Eastern Norway;41, Doctoral thesis, 2019-09-26)In well drilling operations, bottom hole pressure control within a narrow pressure margin has a high risk of influx (kick) and outflux (loss) at greater depths. Kick occurs when the formation pressure is higher than ...