Dynamic Mesh: Pipeline Pigging

This project investigates the pigging process in pipeline transportation using ANSYS Fluent. Pigging refers to the use of inspection devices, commonly known as pigs or scrapers, to perform maintenance and cleaning operations inside large-diameter pipes. In this simulation, the pig begins moving while the outlet valve remains closed, with the domain initially filled with air. The analysis focuses on the pressure distribution on the pig's surface and along the central plane of the pipe, with particular attention to the junction where two pipe sections meet, since this region is critical from a pressure standpoint.

The geometry was created in SpaceClaim, and the mesh was generated in ANSYS Meshing using tetrahedral elements, chosen for their compatibility with the deformation and remeshing required by the pig's motion. The final mesh contains 659,988 volume cells and meets the quality requirements for the simulation.

Methodology

The motion of the pig through the pipeline is captured using the Dynamic Mesh method, with the Remeshing and Smoothing sub-models handling the deformation and regeneration of mesh elements as the device advances.

Results

The simulation provides the static pressure distribution on the pig's surface, with clear variations visible from different viewpoints along the pipeline. An animation was also generated, illustrating the pig's continuous movement from the start of the simulation until it approaches the outlet.

For pipelines containing fluids such as water or oil rather than air, the model can be adapted to represent these conditions, allowing the cleaning process to be evaluated under more realistic operating scenarios.