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Multiprocessing for the Particle Tracking Model MODPATH.

Rodrigo Pérez-Illanes1, Daniel Fernàndez-Garcia1

  • 1Department of Civil and Environmental Engineering (DECA), Hydrogeology Group (UPC-CSIC), Universitat Politècnica de Catalunya, Jordi Girona 3-4, 08034, Barcelona, Spain.

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Parallel processing speeds up particle tracking in aquifer simulations. Implementing OpenMP in MODPATH enhances computational efficiency for solute transport studies, especially with many particles.

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Area of Science:

  • Hydrogeology
  • Computational Science

Background:

  • Particle tracking is crucial for understanding solute transport in aquifers, providing insights into travel times and flow paths.
  • Complex flow models and numerous particle groups increase computational demands for particle tracking simulations.
  • MODPATH, a particle tracking tool for MODFLOW, has potential for parallel processing.

Purpose of the Study:

  • To implement and evaluate parallel processing for particle tracking in MODPATH using the OpenMP library.
  • To assess the performance gains of parallelized MODPATH on synthetic aquifer models.

Main Methods:

  • The study implemented parallel processing for MODPATH using the OpenMP library.
  • Performance tests were conducted on synthetic aquifer models with varying numbers of particles.
  • Speedup analysis was performed using dynamic thread scheduling and exclusive output files.

Main Results:

  • Parallel processing significantly reduces simulation runtimes for MODPATH, particularly with a large number of particles.
  • Dynamic thread scheduling demonstrated better adaptivity for heterogeneous flows with slow-moving particles.
  • Using thread-exclusive output files further increased speedup factors when recording particle positions over time.

Conclusions:

  • Parallelizing MODPATH with OpenMP offers substantial computational benefits for solute transport modeling.
  • The efficiency of parallel processing is influenced by flow heterogeneity and the chosen scheduling/output methods.
  • This approach makes complex aquifer simulations more computationally feasible.