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Note: all event times are in eastern (EST/EDT)

Join us for a webinar focused on building high-quality HydroGeoSphere models that are more likely to converge on a solution, and optimizing those models and numerical criteria to reduce model runtimes. We’ll review a number of different numerical concepts with a focus on practical guidance on how to approach convergence optimization.

In this webinar Dr. Killian Miller and Dr. Hyoun-Tae Hwang will introduce key topics and considerations that should form the basis for all climate change impact analyses using HydroGeoSphere. Topics of discussion will include:

• Review of solver methods and options

  • Finite difference vs finite element

  • Control volume vs standard finite difference

  • Level of fill, drop tolerance preconditioning/threshold, etc.

  • Solver acceleration techniques

  • Upstream weighting factor, central weighting

  • Underrelaxation factor

  • Dual node vs common node formulation

• Review of solver output, i.e. understanding phgs.exe runtime output

  • Simulation progress output

  • Summary of nonlinear iteration

  • Adaptive timestepping summary

• Recommendations for optimizing convergence of different types of problems

  • Numerical setting recommendations for different types of problems

  • How to read runtime output, which variables to monitor, how to respond and improve runtime

  • Review debug.control and restart functionality

  • General tips & tricks (i.e. building a high quality mesh, starting with appropriate initial conditions, etc.)

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Interested in learning more about the control volume finite element method at the heart of HydroGeoSphere, and some of the benefits it provides (e.g. mass conservative, physically correct flow directions, monotonicity/no oscillations, etc.)? Watch our Numerical Methods and Parallel Processing webinar: