Effects of selection of inlet perturbations, multiphase and turbulence equations on slug flow characteristics using altair® acusolve�

Selection of inlet perturbations, multiphase equations, and the turbulence equation may affect the development of slug flow using computational fluid dynamic simulation tools. The inlet perturbation, such as sinusoidal and random perturbations, play an essential role in inducing slug formation. Mult...

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Main Authors: Basith, M.S.A., Sallih, N., Soon, W.P.K., Shibano, S.T., Singh, R., Sulong, M.A.
Format: Article
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.29607 /
Published: MDPI 2021
Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85121419462&doi=10.3390%2fpr9122152&partnerID=40&md5=a20c15e9e8f8ae94291da3a86838cc4f
http://eprints.utp.edu.my/29607/
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spelling utp-eprints.296072022-03-25T02:10:19Z Effects of selection of inlet perturbations, multiphase and turbulence equations on slug flow characteristics using altair® acusolve� Basith, M.S.A. Sallih, N. Soon, W.P.K. Shibano, S.T. Singh, R. Sulong, M.A. Selection of inlet perturbations, multiphase equations, and the turbulence equation may affect the development of slug flow using computational fluid dynamic simulation tools. The inlet perturbation, such as sinusoidal and random perturbations, play an essential role in inducing slug formation. Multiphase equations such as volume of fluid and level set methods are used to track and capture the gas-liquid immiscible interface. Similarly, turbulence equations such as Spalart Allmaras (SA), Detached Eddy Simulations (DES), k-omega, and k-epsilon can be used to predict the evolution of turbulence within the flow. At present, no direct comparison is available in the literature on the selection of (i) types of inlet perturbations, (ii) the choice of multiphase equations, and (iii) the turbulence equation on the development of slug flow using the Altair computational package. This article aims to compare the effects of the selection of inlet perturbations, multiphase models and turbulence equations on slug flow characteristics using Altair® AcuSolve�. The findings by Altair® simulation were compared to published experimental data and simulation works using ANSYS and STAR-CCM+. The slug flow characteristics of interest include slug morphology, a body length-to-diameter ratio, velocity, frequency, and pressure gradient. It was found that the slug flow could be developed for all combinations of settings. Although level set approach in Altair® can track fluid motion successfully, it has a limitation in modelling the convective transport of the multiphase mixture well, unlike ANSYS and STAR-CCM+. Compared to the standard level set method, the coupling of back-and-forth error compensation and correction with the level set function helps to capture the internal boundary more accurately by reducing errors caused by numerical diffusion in the transport of the level set. It was revealed that the Spalart Allmaras turbulence equation could mimic published experimental result better than DES as it produced the closest slug translational velocity. Since the frequency of the slugs for the developed models showed a good agreement with the published data, the models could be sufficient for the investigation of fluid-structure interaction. © 2021 by the authors. Licensee MDPI, Basel, Switzerland. MDPI 2021 Article NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85121419462&doi=10.3390%2fpr9122152&partnerID=40&md5=a20c15e9e8f8ae94291da3a86838cc4f Basith, M.S.A. and Sallih, N. and Soon, W.P.K. and Shibano, S.T. and Singh, R. and Sulong, M.A. (2021) Effects of selection of inlet perturbations, multiphase and turbulence equations on slug flow characteristics using altair® acusolve�. Processes, 9 (12). http://eprints.utp.edu.my/29607/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description Selection of inlet perturbations, multiphase equations, and the turbulence equation may affect the development of slug flow using computational fluid dynamic simulation tools. The inlet perturbation, such as sinusoidal and random perturbations, play an essential role in inducing slug formation. Multiphase equations such as volume of fluid and level set methods are used to track and capture the gas-liquid immiscible interface. Similarly, turbulence equations such as Spalart Allmaras (SA), Detached Eddy Simulations (DES), k-omega, and k-epsilon can be used to predict the evolution of turbulence within the flow. At present, no direct comparison is available in the literature on the selection of (i) types of inlet perturbations, (ii) the choice of multiphase equations, and (iii) the turbulence equation on the development of slug flow using the Altair computational package. This article aims to compare the effects of the selection of inlet perturbations, multiphase models and turbulence equations on slug flow characteristics using Altair® AcuSolve�. The findings by Altair® simulation were compared to published experimental data and simulation works using ANSYS and STAR-CCM+. The slug flow characteristics of interest include slug morphology, a body length-to-diameter ratio, velocity, frequency, and pressure gradient. It was found that the slug flow could be developed for all combinations of settings. Although level set approach in Altair® can track fluid motion successfully, it has a limitation in modelling the convective transport of the multiphase mixture well, unlike ANSYS and STAR-CCM+. Compared to the standard level set method, the coupling of back-and-forth error compensation and correction with the level set function helps to capture the internal boundary more accurately by reducing errors caused by numerical diffusion in the transport of the level set. It was revealed that the Spalart Allmaras turbulence equation could mimic published experimental result better than DES as it produced the closest slug translational velocity. Since the frequency of the slugs for the developed models showed a good agreement with the published data, the models could be sufficient for the investigation of fluid-structure interaction. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
format Article
author Basith, M.S.A.
Sallih, N.
Soon, W.P.K.
Shibano, S.T.
Singh, R.
Sulong, M.A.
spellingShingle Basith, M.S.A.
Sallih, N.
Soon, W.P.K.
Shibano, S.T.
Singh, R.
Sulong, M.A.
Effects of selection of inlet perturbations, multiphase and turbulence equations on slug flow characteristics using altair® acusolve�
author_sort Basith, M.S.A.
title Effects of selection of inlet perturbations, multiphase and turbulence equations on slug flow characteristics using altair® acusolve�
title_short Effects of selection of inlet perturbations, multiphase and turbulence equations on slug flow characteristics using altair® acusolve�
title_full Effects of selection of inlet perturbations, multiphase and turbulence equations on slug flow characteristics using altair® acusolve�
title_fullStr Effects of selection of inlet perturbations, multiphase and turbulence equations on slug flow characteristics using altair® acusolve�
title_full_unstemmed Effects of selection of inlet perturbations, multiphase and turbulence equations on slug flow characteristics using altair® acusolve�
title_sort effects of selection of inlet perturbations, multiphase and turbulence equations on slug flow characteristics using altair⮠acusolve�
publisher MDPI
publishDate 2021
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85121419462&doi=10.3390%2fpr9122152&partnerID=40&md5=a20c15e9e8f8ae94291da3a86838cc4f
http://eprints.utp.edu.my/29607/
_version_ 1741197270366289920
score 11.62408

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