COMSOL Multiphysics ® is a general-purpose software platform, based on advanced numerical methods, for modelling and simulating physics-based problems. In recognition of the breadth and depth of Quintessa's capabilities in the application of COMSOL Multiphysics to model environmental and engineering systems, Quintessa has been appointed as a COMSOL Certified Consultant.

A key aspect of Quintessa's work is state of the art numerical analysis of complex coupled systems. Examples include Thermal-Hydraulic-Mechanical-Chemical (THMC) models of radioactive waste disposal facilities at all scales, detailed predictive and retrospective analysis of field and laboratory experiments, complex non-linear near-surface hydrogeological modelling and novel mechanical modelling of AGR reactor cores. COMSOL Multiphysics forms an increasingly important part of Quintessa's capability to deliver such sophisticated bespoke modelling solutions.

Successful modelling and simulation requires expert users in addition to state-of-the-art software. Quintessa staff have a wide range of scientific experience encompassing the mathematical, physical, chemical, biological and earth sciences, and are well versed at applying their expertise to novel projects, as well as the more established areas of radioactive waste management, contaminated land and groundwater, and sub-surface carbon dioxide storage. Typical multiphysics projects at Quintessa encompass:

  • Hydrogeological Analysis, including conceptual analysis, fate and transport simulation, coupled variable density flow, vapour transport and non-Darcy behaviour.
  • Thermal Analysis, including radiation and non-linear effects.
  • Mechanical Analysis, including coupled poro-mechanics, creep and plasticity.
  • Chemical Analysis, including reactive and non-reactive transport in fractures and porous media, often in direct support of radioactive waste disposal safety cases.

The following images illustrate Quintessa's application of COMSOL Multiphysics to nuclear industry problems.

Image 1: Animated gif of graphite brick distortion in an Advanced Gas Cooled Reactor.

Graphite Brick Distortion

Image 2: Temperature distribution around radioactive waste canisters in a geological repository.

Temperature distribution

Image 3: Surface uplift above a geological repository for high-level radioactive waste.

Surface Uplift