Capabilities Overview

The table below lists the physics GEOS can simulate, with the XML tag of each solver (placed in the <Solvers> block). Each tag links to its complete list of attributes; the last column points to the user guide page or example that explains it. Coupled solvers combine single-physics solvers, which they reference by name (e.g. flowSolverName, solidSolverName, wellSolverName).

Physics	Solver XML tags	Documentation
Single-phase flow	SinglePhaseFVM, SinglePhaseHybridFVM	Singlephase Flow Solver, Tutorial 1: First Steps
Multiphase / compositional flow	CompositionalMultiphaseFVM, CompositionalMultiphaseHybridFVM, ImmiscibleMultiphaseFlow, ReactiveCompositionalMultiphaseOBL	Compositional Multiphase Flow Solver, Immiscible Multiphase Flow Solver, Multiphase Flow
Thermal flow	Flow and poromechanics solvers with isThermal="1"	Thermoporomechanics
Wells	WellManager (well definitions and controls), coupled to the reservoir by SinglePhaseReservoir, CompositionalMultiphaseReservoir	Compositional Multiphase Well Solver, Multiphase Flow with Wells, CO 2 Injection
Solid mechanics	SolidMechanicsLagrangianFEM, SolidMechanics_MPM (material point method)	Solid Mechanics Solver, Tutorial 4: Boundary Conditions and Time-Dependent Functions, Viscoplasticity
Contact and fractures	SolidMechanicsLagrangeContact, SolidMechanicsLagrangeContactBubbleStab, SolidMechanicsAugmentedLagrangianContact, SolidMechanicsEmbeddedFractures, SurfaceGenerator, EmbeddedSurfaceGenerator	Contact Mechanics Solver, Faults & fractures
Poromechanics	SinglePhasePoromechanics, MultiphasePoromechanics, with wells: SinglePhasePoromechanicsReservoir, SinglePhaseReservoirPoromechanics, MultiphasePoromechanicsReservoir, CompositionalMultiphaseReservoirPoromechanics	Poromechanics Solver, Poromechanics, Poromechanics
Poromechanics with fractures	SinglePhasePoromechanicsConformingFractures, SinglePhasePoromechanicsConformingFracturesALM, SinglePhasePoromechanicsConformingFracturesReservoir, SinglePhaseReservoirPoromechanicsConformingFractures, SinglePhaseReservoirPoromechanicsConformingFracturesALM, MultiphasePoromechanicsConformingFractures, MultiphasePoromechanicsConformingFracturesALM, CompositionalMultiphaseReservoirPoromechanicsConformingFractures, CompositionalMultiphaseReservoirPoromechanicsConformingFracturesALM, SinglePhasePoromechanicsEmbeddedFractures, OneWayCoupledFractureFlowContactMechanics	Faults & fractures
Hydraulic fracturing and proppant	Hydrofracture, ProppantTransport, SinglePhaseProppantFVM, FlowProppantTransport	Hydraulic Fracturing, Hydraulic Fracture, Proppant Transport Solver
Phase-field fracture	PhaseFieldDamageFEM, PhaseFieldFracture, PhaseFieldPoromechanics	Datastructure pages only
Wave propagation (seismic)	AcousticSEM, AcousticFirstOrderSEM, AcousticVTISEM, AcousticDG, AcousticElasticSEM, ElasticSEM, ElasticFirstOrderSEM	Datastructure pages only
Induced seismicity	SeismicityRate, ExplicitSpringSlider, ImplicitSpringSlider, ExplicitQuasiDynamicEQ, ImplicitQuasiDynamicEQ	Datastructure pages only
Reactive transport	SinglePhaseReactiveTransport	Datastructure pages only
Other	LaplaceFEM (Laplace equation, used as a simple example and in tests)	Adding a new Physics Solver

Supporting features used across these solvers include structured and unstructured meshes (Meshes), finite-volume (TPFA, hybrid mimetic) and finite-element discretizations (Numerical Methods), a library of constitutive models (Constitutive Models), standalone material-model drivers for calibration (Constitutive Drivers), and a Python interface (pygeosx — GEOS in Python).