Modeling computational fluid dynamics of multiphase flows in elbow and T-junction of the main gas pipeline
Abstract
The research was performed in order to obtain the physical picture of the movement of condensed droplets and solid particles in the flow of natural gas in elbows and T-junctions of the linear part of the main gas pipeline. 3D modeling of the elbow and T-junction was performed in the linear part of the gas main, in particular, in places where a complex movement of multiphase flows occurs and changes its direction. In these places also occur swirls, collisions of discrete phases in the pipeline wall, and erosive wear of the pipe wall. Based on Lagrangian approach (Discrete Phase Model – DPM), methods of computer modeling were developed to simulate multiphase flow movement in the elbow and T-junction of the linear part of the gas main using software package ANSYS Fluent R17.0 Academic. The mathematical model is based on solving the Navier–Stokes equations, and the equations of continuity and discrete phase movement closed with Launder–Sharma (k–e) two-parameter turbulence model with appropriate initial and boundary conditions. In T-junction, we simulated gas movement in the run-pipe, and the passage of the part of flow into the branch. The simulation results were visualized in postprocessor ANSYS Fluent R17.0 Academic and ANSYS CFD-Post R17.0 Academic by building trajectories of the motion of condensed droplets and solid particles in the elbow and T-junction of the linear part of the gas main in the flow of natural gas. The trajectories were painted in colors that match the velocity and diameter of droplets and particles according to the scale of values. After studying the trajectories of discrete phases, the locations of their heavy collision with the pipeline walls were found, as well as the places of turbulence of condensed droplets and solid particles. The velocity of liquid and solid particles was determined, and the impact angles, diameters of condensed droplets and solid particles in the place of collision were found. Such results provide possibilities for a full and comprehensive investigation of erosive wear of the elbow and T-junction of the linear part of the gas main and adjacent sections of the pipeline, and for the assessment of their strength and residual life.
Keyword : pipeline, elbow, discrete phase, erosive wear, Lagrange approach, movement trajectory, T-junction
This work is licensed under a Creative Commons Attribution 4.0 International License.
References
Azimian, M.; Bart, H.-J. 2014. Investigation of hydroabrasion in slurry pipeline elbows and T-junctions, Journal of Energy and Power Engineering 8(1): 65–78. https://doi.org/10.17265/1934-8975/2014.01.008
Chu, K. W.; Yu, A. B. 2008. Numerical simulation of complex particle–fluid flows, Powder Technology 179(3): 104–114. https://doi.org/10.1016/j.powtec.2007.06.017
Doroshenko, Ya.; Marko, T.; Doroshenko, Yu. 2016. Doslidzhennya dynamiky ruhu bagatofaznyh potokiv fasonnymy elementamy obv’yazky kompresornoji stanciji magistral’nogo gazoprovodu [Research multiphase flows motion in compressor stations fittings of main gas pipelines], Mizhnarodnyj Naukovyj Zhurnal [International Scientific Journal] 7: 68–77. (in Ukrainian). https://doi.org/10.21267/IN.2016.7.2662
Forder, A.; Thew, M.; Harrison, D. 1998. A numerical investigation of solid particle erosion experienced within oilfield control valves, Wear 216(2): 184–193. https://doi.org/10.1016/S0043-1648(97)00217-2
GazTU 102-488/1-05. Detali soedinitel’nye i uzly dlya magistral’nyh gazoprovodov na Rr do 9,8 MPa (100 kgs/kv.sm) (in Russian).
Gimatudinov, Sh. K. 1971. Fizika neftyanogo i gazovogo plasta. Moskva: Nedra. 312 s. (in Russian).
GOST 5542–87. Gazy goryuchie prirodnye dlya promyshlennogo i kommunal’no-bytovogo naznacheniya. Tehnicheskie usloviya (in Russian).
Kotlyar, I. Ya.; Piljak, V. M. 1971. Jekspluataciya magistral’nyh gazoprovodov. Leningrad: Nedra. 248 s. (in Russian).
Kuan, B. T. 2005. CFD simulation of dilute gas-solid two-phase flows with different solid size distributions in a curved 90° duct bend, Australian and New Zealand Industrial and Applied Mathematics Journal 46: C744–C763. https://doi.org/10.21914/anziamj.v46i0.988
Lytvynenko, I.; Maruschak, P.; Prentkovskis, O.; Sorochak, A. 2018. Modelling kinetics of dynamic crack propagation in a gas mains pipe as cyclic random process, Lecture Notes in Networks and Systems 36: 262–269. https://doi.org/10.1007/978-3-319-74454-4_25
Maruschak, P.; Poberezhny, L.; Pyrig, T. 2013. Fatigue and brittle fracture of carbon steel of gas and oil pipelines, Transport 28(3): 270–275. https://doi.org/10.3846/16484142.2013.829782
Maruschak, P.; Bishchak, R.; Prentkovskis, O.; Poberezhnyi, L.; Danyliuk, I.; Garbinčius, G. 2016a. Peculiarities of the static and dynamic failure mechanism of long-term exploited gas pipeline steel, Advances in Mechanical Engineering 8(4): 1–8. https://doi.org/10.1177/1687814016641565
Maruschak, P.; Prentkovskis, O.; Bishchak, R. 2016b. Defectiveness of external and internal surfaces of the main oil and gas pipelines after long-term operation, Journal of Civil Engineering and Management 22(2): 279–286. https://doi.org/10.3846/13923730.2015.1100672
Maruschak, P.; Danyliuk, I.; Prentkovskis, O.; Bishchak, R.; Pylypenko, A.; Sorochak, A. 2014. Degradation of the main gas pipeline material and mechanisms of its fracture, Journal of Civil Engineering and Management 20(6): 864–872. https://doi.org/10.3846/13923730.2014.971128
Maruschak, P.; Poberezny, L.; Prentkovskis, O.; Bishchak, R.; Sorochak, A.; Baran, D. 2018. Physical and mechanical aspects of corrosion damage of distribution gas pipelines after long-term operation, Journal of Failure Analysis and Prevention 18(3): 562–567. https://doi.org/10.1007/s11668-018-0439-z
Mohanarangam, K.; Tian, Z. F.; Tu, J. Y. 2008. Numerical simulation of turbulent gas–particle flow in a 90° bend: Eulerian–Eulerian approach, Computers & Chemical Engineering 32(3): 561–571. https://doi.org/10.1016/j.compchemeng.2007.04.001
OST 102-61-81. Detali magistral’nyh truboprovodov stal’nye privarnye na Ru do 10,0 MPa (100 kgs/sm2). Trojniki svarnye s usilivayushhimi nakladkami. Razmery (in Russian).
Panin, S. V.; Maruschak, P. O.; Vlasova, I. V.; Syromyatnikova, A. S.; Bolshakov, A. M.; Berto, F.; Prentkovskis, O.; Ovechkin, B. B. 2017. Effect of operating degradation in arctic conditions on physical and mechanical properties of 09Mn2Si pipeline steel, Procedia Engineering 178: 597–603. https://doi.org/10.1016/j.proeng.2017.01.117
Poberezhnyi, L.; Maruschak, P.; Prentkovskis, O.; Danyliuk, I.; Pyrig, T.; Brezinová, J. 2016. Fatigue and failure of steel of offshore gas pipeline after the laying operation, Archives of Civil and Mechanical Engineering 16(3): 524–536. https://doi.org/10.1016/j.acme.2016.03.003
Poberezhny, L.; Maruschak, P.; Hrytsanchuk, A.; Poberezhna, L.; Prentkovskis, O; Stanetsky, A. 2017. Impact of gas hydrates and long-term operation on fatigue characteristics of pipeline steels, Procedia Engineering 187: 356–362. https://doi.org/10.1016/j.proeng.2017.04.386
Sinajskij, Je.; Lapiga, E.; Zajcev, Yu. 2002. Separaciya mnogofaznyh mnogokomponentnyh system. Moskva: Nedra. 622 s. (in Russian).
Squires, K. D.; Eaton, J. K. 1990. Particle response and turbulence modification in isotropic turbulence, Physics of Fluids A: Fluid Dynamics 2(7): 1191–1203. https://doi.org/10.1063/1.857620
Usachyov, A. P.; Shurajc, A. L.; Zhelanov, V. P.; Nedlin, M. S.; Demchuk, V. Ju.; Zubailov, G. I. 2009. Analiz opasnyh sovmestnyh vozdejstvij mehanicheskih chastic i neproporcional’nyh usilij na jelementy gazoreguljatornyh punktov, Nauchno-tehnicheskie problemy sovershenstvovaniya i razvitiya sistem gazojenergosnabzheniya 6: 4–14. (in Russian).
Vilkys, T.; Rudzinskas, V.; Prentkovskis, O.; Tretjakovas, J.; Višniakov, N.; Maruschak, P. 2018. Evaluation of failure pressure for gas pipelines with combined defects, Metals 8(5): 346. https://doi.org/10.3390/met8050346