v0.3.1

Fimbul v0.3.1

Diff since v0.3.0

Release Notes Fimbul v0.3.1

New Features

• BTES and Closed-Loop Systems:
  • Added support for U1 (U-tube) and coaxial borehole thermal energy storage (BTES) systems.
  • Implemented analytical solutions for BTES and coaxial systems for validation.
  • Added convenience functions for deriving closed-loop geometry from well data domains.

Improvements

• Meshing: Added option to control terminal output during meshing.
• Validation: Added validation functionality for closed-loop systems.

Bug Fixes

• Corrected units in axis labels.
• Fixed minor bugs in BTES setup and coaxial implementation.

Merged pull requests:

• BTES (#31) (@strene)
• Bump version (#32) (@strene)

v0.3.0

Fimbul v0.3.0

Diff since v0.2.1

Fimbul.jl v0.3.0 Release Notes

Breaking changes:

• Case setup functions: All setup functions now returns meta-data and other useful case info to case.input_data instead of as separate outputs.
  -Schedule setup: Function make_schedule() now require that the first and last dates are identical for cases set up with dates.

Major New Features

Advanced Geothermal Systems (AGS)

• New ags() function: Complete AGS case setup with closed-loop circulation systems

Enhanced Well Systems

• New well utilities: setup_btes_well() and setup_vertical_btes_well() for specialized BTES configurations, moved over from JutulDarcy.

Expanded Testing Framework

• Comprehensive schedule testing: Robust validation of time-dependent scheduling with multiple cycles

Enhanced Documentation & Examples

• AGS demo: Complete workflow demonstrating closed-loop geothermal systems
• Improved example comments: Enhanced technical explanations and educational content
• Better function documentation: More comprehensive parameter descriptions and usage examples

New/enhanced functions

• ags() - Advanced Geothermal System setup
• setup_btes_well() - BTES well configuration
• setup_vertical_btes_well() - Vertical BTES well setup
• Improved make_schedule() with better date handling

Documentation: sintefmath.github.io/Fimbul.jl
Source Code: github.com/sintefmath/Fimbul.jl

Developed by SINTEF Digital

Merged pull requests:

• Refactor to new JutulDarcy release (#28) (@strene)

v0.2.1

Fimbul v0.2.1

Diff since v0.2.0

Enhanced Geothermal Systems (EGS) Support

New Features:

• EGS Case Setup: Added egs() function for creating Enhanced Geothermal System simulations with fracture networks

EGS Demo Example:

• Complete EGS simulation workflow with 10-year thermal depletion analysis
• Individual fracture performance tracking and visualization

For detailed documentation and examples, visit the Fimbul.jl documentation.

Merged pull requests:

• Enhanced geothermal system (#27) (@strene)

v0.2.0

Fimbul v0.2.0

Diff since v0.1.0

Fimbul.jl v0.2.0 – Release Notes

Breaking Changes

• make_utes_schedule
  The function now expects charge and discharge periods to be specified as date ranges:
  • Charging: [start_charge, end_charge]
  • Discharging: [start_discharge, end_discharge]
    This replaces the previous format using month names. Internally, the function delegates to a new utility, make_schedule, for processing.

New Features

• ates
  A new function for setting up simulation cases for Aquifer Thermal Energy Storage (ATES) systems.

• make_schedule
  A utility for defining simulation schedules composed of multiple periods, each with distinct driving forces.

Merged pull requests:

• Getting started fix (#23) (@strene)
• Aquifer thermal energy storage (#25) (@strene)
• Version 0.2.0 (#26) (@strene)

v0.1.0

Fimbul v0.1.0

Fimbul.jl v0.1.0 Release Notes

Fimbul.jl — A Julia-based toolbox for geothermal energy simulation built on JutulDarcy.jl. Written entirely in Julia, Fimbul provides specialized tools for setting up, simulating, and analyzing various geothermal energy scenarios.

Industry-relevant examples and workflows

• Geothermal energy production (doublet.jl): 200-year geothermal energy production simulation from well doublet
• BTES storage (btes.jl): Seasonal Borehole Thermal Energy Storage (BTES) with 48 wells across six parallel sectors
• HT-ATES digital twin (egg_htates.jl): Advanced calibration workflows for aquifer thermal energy storage
• Analytical verification (analytical_1d.jl): Heat equation solver validation with convergence studies

Built on Solid Foundations

• High-performance: Built on Jutul.jl/JutulDarcy.jl for fully differentiable, high-performance reservoir simulation
• Advanced physics: Temperature-dependent fluid properties and specialized models supporting closed-loop and perforated wells
• Robust numerics: Handles realistic geomodels and complex wellbore trajectories with state-of-the art linear and nonlinear solvers
• Julia native: Fast, modern, and fully differentiable workflows

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Documentation: https://sintefmath.github.io/Fimbul.jl/dev/
Source Code: https://github.com/sintefmath/Fimbul.jl
License: MIT

Developed by the Applied Computational Science group at SINTEF Digital