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The present paper focusses on the numerical rebuilding of different multiphase flow regimes in a medium scale pipe system (6 inch). Principal investigations are performed by CFD to initiate hydrodynamic instabilities and develop them into the correct flow pattern (slug, stratified, etc.) at a given downwind position without applying artificial models or boundary conditions.
The numerical predictions of the flow obtained by a volume of fluid CFD method (OpenFoam) are compared with available experimental data. Numerical investigations are performed with respect to grid resolution, initial conditions and turbulence modelling but also for obtaining a representative, comparable set of numerical and experimental data.
For different flow regimes from slug flow to stratified flow good agreement with the experimental data was achieved with respect to the predicted flow regime and topology but also the forces predicted on the bend. Especially the large variation of the root mean squared values but also peak-to-peak values of the forces are predicted well by the numerical solutions for the different flow regimes.
CFD, flow regimes, forces on bends, Multiphase flow, OpenFoam, VOF
[1] Belfroid, S., Nennie, E., van Wijhe, A., Pereboom, H. & Lewis, M., Multiphase forces on bend structures – overview large scale 6” experiments. proceeding of 11th Conference on Flow-Induced Vibration and Noise, The Hague, The Netherlands, 4–6 July, 2016.
[2] Belfroid, S.P.C. & Nennie, E., JIP Forces on Bends due to multiphase flow (6”), TNO project report 24.03.2015, Delft, The Netherlands, 2015.
[3] Emmerson, P., Lewis, M. & Barton, N., Multiphase forces on bend structuresinfluence of upstream disturbance. Proceeding of 11th Conference on Flow-Induced Vibration and Noise, The Hague, The Netherlands, 4–6 July, 2016.
[4] Pontaza, J, Kreeft, J.J., Abuali, B., Smith, F.J. & Brown, G.W., Flow-induced forces in piping due to multiphase flow: prediction by CFD, The Hague, The Netherlands, 4–6 July 2016.
[5] Vaze, M.J. & Banerjee, J., Experimental visualization of two-phase flow patterns and transition from stratifed to slug flow. Journal of Mechanical Engineering Science, 225, pp. 382–389, 2011. https://doi.org/10.1243/09544062jmes2033
[6] Deshpande, S.S., Anumolu, L. & Trujillo, M.F., Evaluating the performance of the twophase flow solver interFoam. Computational Science & Discovery, 5(1), p. 014016, 2012.https://doi.org/10.1088/1749-4699/5/1/014016
[7] Shuard, A.M., Mahmud, H.B. & King, A.J., Comparison of Two-Phase Pipe Flow in OpenFOAM with a Mechanistic Model. IOP Conference Series: Materials Science and Engineering, 121, p. 012018, 2016. https://doi.org/10.1088/1757-899x/121/1/012018
[8] Thaker J.P. & Banerjee J., CFD simulation of two-phase flow phenomena in horizontal pipelines using openfoam. Proceeding for the 40th National Conference on Fluid Mechanics & Fluid Power (Hamipur) FMFP2013 paper 34, 2013.
[9] McCaslin, J. & Desjardins, O., Numerical investigation of gravitational effects in horizontal annular liquid–gas flow. International Journal of Multiphase Flow, 67, pp. 88–105, 2014.https://doi.org/10.1016/j.ijmultiphaseflow.2014.08.006