Pigging Oil Flow in a Pipeline CFD Simulation

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The present problem simulates the pigging oil flow inside pipelines using ANSYS Fluent software.

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Description

Pigging Oil Flow in a Pipeline CFD Simulation, ANSYS Fluent Training

The present problem simulates the pigging oil flow inside pipelines using ANSYS Fluent software. Inside this model’s pipeline is a piece called a pig.

The term pig stands for Pipeline Inspection Gauge and is used in pipelines to check and record geometric and fluid information, as well as other items such as cleaning pipes and creating a physical barrier between two different fluids, etc Using pigs inside pipelines and controlling and directing them is called pigging.

Since the presence of pigs in the passage of fluid flow can act as a barrier, the use of these pigs can cause a pressure drop in the flow of the desired fluid, which is known as a problem that must be addressed. The present model defines a simple stationary pig inside a pipeline.

The purpose of the present simulation is to investigate the behavior of the fluid around the body of this pig inside the pipe and the pressure drop on both the upper and lower sides of the pig.

The simulation process is performed in two modes. Thus, oil flow with different inlet speeds, including 0.9 m/s and 1.9 m/s,, enters the pipeline’s interior.

Also, the VOF multi-phase model has been used to define the oil and gas materials in the pipelines and two materials have been defined as gas-oil and petro in the present model. This simulation was performed in 90 seconds with a time step of 0.03 seconds.

Geometry & Mesh

The present model is designed in two dimensions using Design Modeler software. The model includes a pipeline with a certain geometry with a simple pig inside it. The following figure shows a view of the geometry.

Pigging

The meshing of the present model has been done using ANSYS Meshing software. The mesh type is unstructured and the element number is 5789. The following figure shows an overview of the mesh.

Pigging

Pigging CFD Simulation

To simulate the present model, several assumptions are considered:

  • We perform a pressure-based solver.
  • The simulation is transient; the amount of pressure drop changes on the pig’s top and bottom sides have been investigated over time.
  • The gravity effect on the fluid is ignored.

A summary of the defining steps of the problem and its solution is given in the following table:

Models
Viscous k-epsilon
k-epsilon model standard
near-wall treatment standard
Multiphase Model VOF
number of Eulerian phases 2 (gas-oil & petro)
formulation implicit
interface modeling sharp
Boundary conditions
Inlet 1 Velocity Inlet
velocity magnitude variable (0.9 & 1.9 m.s-1)
volume fraction for petro 1
volume fraction for gas-oil 0
Outlet Pressure Outlet
gauge pressure 0 pascal
Walls (walls of pipeline & walls of pig) Wall
wall motion stationary wall
Methods
Pressure-Velocity Coupling SIMPLE
Pressure PRESTO
momentum second-order upwind
volume fraction compressive
turbulent kinetic energy first-order upwind
turbulent dissipation rate first-order upwind
Initialization
Initialization methods Standard
gauge pressure 0 pascal
x-velocity 0 m.s-1
y-velocity variable (0.9 & 1.9 m.s-1)
petro volume fraction 0

Pigging Results

At the end of the solution process, two-dimensional contours related to the pressure, velocity, and volume fraction of each phase defined in the model are obtained. All contours of both cases are obtained at the last second of the simulation process.

Reviews

  1. Avatar Of Louisa Sauer

    Louisa Sauer

    This pigging simulation looks very detailed. Were there any challenges in modeling the interaction between the pig and the varying flow rates in the pipeline?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      In this CFD simulation, capturing the interaction between the pig and the oil flow at different velocities was handled using robust meshing and appropriate numerical settings. Special attention was given to the volume fraction settings and pressure-velocity coupling to handle the varying flow rates accurately.

  2. Avatar Of Prof. Quincy Lemke Ii

    Prof. Quincy Lemke II

    I followed the training for the Pigging Oil Flow in a Pipeline CFD Simulation using ANSYS Fluent and it was fantastic! The step-by-step guidance made understanding the complex interactions in the pigging process much clearer. The variation in inlet speeds adding to the complexity was well illustrated. Additionally, learning about the mesh generation and the rationale behind using an unstructured mesh type was very insightful.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your positive feedback! We’re delighted to hear that you found the training effective and insightful, especially with regards to understanding the complexities and mesh generation considerations in simulating pigging operations in pipelines. We strive to provide clear and detailed instruction, and we’re glad it resonated with you. Your appreciation is a testament to our commitment to quality education for our users.

  3. Avatar Of David Waelchi Phd

    David Waelchi PhD

    The level of detail in the simulation of the pigging oil flow is remarkable! The diligent work in demonstrating the pressure drop across the pig and providing such a varied inlet speed to showcase different conditions is truly commendable.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your kind words! We’re thrilled to hear that the comprehensive approach to the oil flow pigging simulation in ANSYS Fluent was insightful for you. Your recognition of the detail and varied conditions within the simulation validates the effort put into producing a quality educational experience. If you have any more feedback or need further information about our products, we’re always here to help!

  4. Avatar Of Ms. Claire Adams

    Ms. Claire Adams

    What specific insights does this pigging simulation provide regarding pressure drop, and how can those insights be used in an actual pipeline system?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      The pigging simulation provides precise data on the pressure drop caused by the presence of a pig in the pipeline, showing how it varies with different inlet velocities. This information is crucial for pipeline engineers to optimize pigging operations, ensuring efficient maintenance and the safe transportation of fluids without undue wear on the pipeline or the pig itself.

  5. Avatar Of Kenya Hackett Sr.

    Kenya Hackett Sr.

    I was particularly impressed with the level of detail in the simulation of pigging oil flow inside pipelines using the VOF model. The intricacy of your meshwork catering to the behavior of fluid around the pig and how it influences pressure drop is commendable. Well done!

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you so much for sharing your positive experience! We’re delighted to know that you appreciated the detail and complexity of our CFD simulation of pigging oil flow. Our team works hard to provide accurate and informative simulations, and it’s great to hear we met your expectations. If you have further inquiries or need assistance with future projects, please don’t hesitate to reach out.

  6. Avatar Of Kasandra Rogahn

    Kasandra Rogahn

    I love how the pigging CFD simulation captures important flow characteristics around the pig structure. This training kit clearly outlines the process and appears comprehensive for understanding pressure drop effects during pigging in pipelines. Job well done!

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your kind words and positive feedback! We’re thrilled to hear that the Pigging Oil Flow in a Pipeline CFD Simulation has provided a thorough understanding of the process and its effects. We appreciate you taking the time to share your experience with our training product.

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