A Transient Multiphase Flow Simulation Using Steady-State Correlations for Coiled-Tubing Applications: New Insights to Old Problems

Shear stress is often present in the blood flow within blood-contacting devices, which is the leading cause of hemolysis. However, the simulation method for blood flow with shear stress is still not perfect, especially the multiphase flow model and experimental verification. In this regard, this study proposes an enhanced discrete phase model for multiphase flow simulation of blood flow with shear stress. This simulation is based on the discrete phase model (DPM). According to the multiphase flow characteristics of blood, a virtual mass force model and a pressure gradient influence model are added to the calculation of cell particle motion. In the experimental verification, nozzle models were designed to simulate the flow with shear stress, varying the degree of shear stress through different nozzle sizes. The microscopic flow was measured by the Particle Image Velocimetry (PIV) experimental method. The comparison of the turbulence models and the verification of the simulation accuracy were carried out based on the experimental results. The result demonstrates that the simulation effect of the SST k- ω model is better than other standard turbulence models. Accuracy analysis proves that the simulation results are accurate and can capture the movement of cell-level particles in the flow with shear stress. The results of the research are conducive to obtaining accurate and comprehensive analysis results in the equipment development phase.

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Computational Investigation of Inclusion Removal in the Steel-Refining Ladle Process

Processes ◽

10.3390/pr9061048 ◽

2021 ◽

Vol 9 (6) ◽

pp. 1048

Author(s):

Xipeng Guo ◽

Joel Godinez ◽

Nicholas J. Walla ◽

Armin K. Silaen ◽

Helmut Oltmann ◽

...

Keyword(s):

Multiphase Flow ◽

Porous Plug ◽

Cfd Modeling ◽

Balance Model ◽

Computational Investigation ◽

Inclusion Removal ◽

Inclusion Interaction ◽

Computational Fluid Dynamics Cfd ◽

Steel Refining ◽

Transient Multiphase Flow

In a steel-refining ladle, the properties of manufactured steel can be notably degraded due to the presence of excessive inclusions. Stirring via gas injection through a porous plug is often used as part of the steel-refining process to reduce these inclusions. In this paper, 3D computational fluid dynamics (CFD) modeling is used to analyze transient multiphase flow and inclusion removal in a gas-stirred ladle. The effects of gas stirring with bubble-inclusion interaction are analyzed using the Euler–Euler approach for multiphase flow modeling, while the effects of inclusions aggregation and removal are modeled via a population balance model (PBM).

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Kinetic-based Multiphase Flow Simulation

IEEE Transactions on Visualization and Computer Graphics ◽

10.1109/tvcg.2020.2972357 ◽

2020 ◽

pp. 1-1 ◽

Cited By ~ 1

Author(s):

Wei Li ◽

Daoming Liu ◽

Mathieu Desbrun ◽

Jin Huang ◽

Xiaopei Liu

Keyword(s):

Multiphase Flow ◽

Flow Simulation

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Modelling Complex Well Behaviour in the Field Using a Transient Multiphase Flow Simulator (Russian)

10.2118/192517-ru ◽

2018 ◽

Author(s):

Kanat Karatayev ◽

Beibit Bissakayev ◽

Tamer Saada ◽

Benjamin Madeley ◽

Alberto Brancolini ◽

...

Keyword(s):

Multiphase Flow ◽

Flow Simulator ◽

Transient Multiphase Flow ◽

Complex Well

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Modelling Complex Well Behaviour in the Field Using a Transient Multiphase Flow Simulator

10.2118/192517-ms ◽

2018 ◽

Cited By ~ 1

Author(s):

Kanat Karatayev ◽

Beibit Bissakayev ◽

Tamer Saada ◽

Benjamin Madeley ◽

Alberto Brancolini ◽

...

Keyword(s):

Multiphase Flow ◽

Flow Simulator ◽

Transient Multiphase Flow ◽

Complex Well

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Unloading Frac Hits in Gas Wells: How Does the Nitrogen Injection Rate and Pressure Affect the Unloading Process?

10.2118/200962-ms ◽

2021 ◽

Author(s):

Miguel Angel Cedeno

Keyword(s):

Multiphase Flow ◽

Flow Rate ◽

Injection Pressure ◽

Injection Rate ◽

Gas Wells ◽

Eagle Ford Shale ◽

Eagle Ford ◽

Nitrogen Injection ◽

Injection Flow ◽

Transient Multiphase Flow

Abstract The unconventional resources development has grown tremendously as a result of the advancement in horizontal drilling technology coupled with hydraulic fracturing. However, as more wells are drilled and fractured close to each other, frac hits have become a major challenge in these wells. The aim of this work is to investigate the effect of nitrogen injection flow rate and pressure on unloading frac hits gas wells in transient multiphase flow. A numerical simulation model was created using a transient multiphase flow simulator to mimic the unloading process of frac hits by injecting nitrogen from the surface through the annulus section of the well. Many simulation cases were created and analyzed to comprehend the effect of the nitrogen injection rate and pressure on the unloading of frac hits. The model mimicked real field data from currently active well in the Eagle Ford Shale. The results showed that as the nitrogen injection pressure increases, the nitrogen volume and the time to unload the frac hits decrease. On the other hand, increasing the injection rate of nitrogen will increase the nitrogen volume required to unload the frac hits. In addition, the time to unload frac hits will be decreased as the nitrogen injection rate increases. These results indicate that the time required to unload frac hits will be minimized if higher flow rates of nitrogen were utilized. Nonetheless, the volume of nitrogen required to unload the frac hits will be maximized. An important observation to highlight is that the operators can save money by reducing the time for injecting nitrogen. This observation was verified when increasing the injection pressure in the frac hit well in the Eagle Ford Shale, the time of injection was reduced 20%. This study presents the effects of nitrogen injection flow rate and injection pressure for unloading frac hits in gas wells. Due to the lack of published studies about this topic, this work can serve as a practical guideline for unloading frac hits in gas wells.

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