GOTHIC includes the following modeling features and capabilities:

• Solves equations for conservation of mass, momentum and energy for three separate fields:
  1. continuous liquid
  2. steam/non-condensable gas mixture
  3. drops
• Built-in water/steam properties
• Multiple field approach gives separate temperatures and velocities for each of the fields.
• Multiphase flow regime, including bubbly flow, slug flow, film flow with drops, and single phase flows.
• Multicomponent gas field for tracking concentration of hazardous gases and chemicals.
• Solves the compressible flow equations.
• Solves for the temperature distribution in solid conductors and includes models for fluid to solid heat transfer as well as thermal radiation exchange.
• Interphase phenomena including condensation on drops, films and pools; evaporation from drops; flashing; drop entrainment from films; drop deposition on walls and floors; ice formation, sublimation and melting.
• Finite volume approach which allows modeling in 1, 2 or 3 dimensions, as well as lumped parameter modeling. Any combination of lumped parameter and multidimensional noding is permitted within a single model.
• Hydrogen combustion in lumped parameter and multidimensional volumes.
• Common engineered components: pumps, fans, valves, doors, vacuum breakers, heat exchangers, spray nozzles, heaters, coolers, hydrogen recombiners and ignitors.
• - turbulence model
• Heat transfer options for regulatory compliance
• Specialized pressure relief valve models for CANDU systems
• Run options for regulatory compliance
• QA support for regulated safety applications