EnSim v2.0.0

[2.0.0] - 2026-01-02

Added

• Multi-Stage Vehicle Support (src/core/staging.py)

  • Stage class with engine configuration and mass properties
  • MultiStageVehicle for complete rocket modeling
  • Presets: Falcon 9, Saturn V, custom configurations
  • Delta-V calculations with payload optimization

• Regenerative Cooling Analysis (src/core/cooling.py)

  • Bartz correlation for gas-side heat transfer
  • Dittus-Boelter coolant-side heat transfer
  • Automatic cooling channel design
  • Wall temperature and heat flux profiles
  • 5 coolant types: RP-1, LH2, LOX, LCH4, Water

• Trajectory Optimization (src/core/optimization.py)

  • Nozzle expansion ratio optimization
  • Stage mass allocation optimization
  • Mission-weighted performance metrics

• Materials Database (src/core/materials.py)

  • 10 aerospace materials with full thermal properties
  • Inconel 718, OFHC Copper, GRCop-84, Haynes 230, etc.
  • Melting points, conductivity, service temperatures

• Mission Analysis (src/core/mission.py)

  • Altitude-dependent performance simulation
  • Optimal operating altitude calculation

• 17 Propellant Presets (src/data/propellant_presets.py)

  • LOX/LH2, LOX/RP-1, LOX/CH4, N2O4/UDMH, etc.
  • Pre-configured O/F ratios and properties

• Unit Conversion System (src/utils/units.py)

  • SI/Imperial toggle in UI
  • Comprehensive conversion functions

• New UI Widgets

  • ThermalAnalysisWidget with heat flux visualization
  • CoolingAnalysisWidget for channel design
  • MultiStageWidget for vehicle configuration
  • OptimizationWidget for trajectory optimization
  • PropellantPresetWidget for quick setup
  • UnitSystemBar for unit toggle

Changed

• Complete UI redesign with Mission Control dark theme
• Reorganized tabs: Output, Results, Engine, Vehicle, Advanced
• Improved color scheme: cyan accents, green values, orange warnings

Fixed

• Thermal analysis now uses proper Bartz correlation
• All module imports working correctly

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Full Changelog: v1.0.2...v2.0.0

EnSim v1.0.2

[1.0.2] - 2026-01-02

Fixed

• Logo and screenshot URLs now use absolute GitHub paths for PyPI display
• All repository URLs corrected to SpaceEngineerSS/EnSim

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Full Changelog: v1.0.1...v1.0.2

EnSim v1.0.1

[1.0.1] - 2026-01-02

Added

• PyPI package publishing support
• Automated release pipeline with trusted publisher

Fixed

• Linting errors across all modules
• Updated type hints to modern Python 3.10+ syntax

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Full Changelog: v1.0.0...v1.0.1

EnSim v1.0.0

[1.0.0] - 2024-12-21

Added

• Core Physics Engine

  • NASA 7-term polynomial thermodynamic data parser
  • Gibbs free energy minimization solver (Gordon & McBride method)
  • 1-D isentropic nozzle flow calculations
  • Numba JIT-optimized functions for real-time performance

• Chemical Species Database

  • H2, O2, H2O, OH, H, O (core H2/O2 combustion)
  • CH4, CO, CO2, N2, N2O (hydrocarbon and nitrous)
  • N2O4, NO2, NO, N2H4 (storable propellants)
  • RP-1 (kerosene surrogate)

• GUI Application (PyQt6)

  • Dark engineering theme
  • KPI dashboard with live updates
  • Input panel with all simulation parameters
  • Efficiency factor inputs (η_c*, η_Cf)
  • Tooltips explaining physics terms
  • Save/Load project (.ensim files)
  • Export to CSV and Markdown report

• Visualization

  • Matplotlib 2D plots (P/Pc, T, Mach vs area ratio)
  • PyVista 3D nozzle with temperature coloring
  • Interactive rotation/zoom

• Documentation

  • README with installation and usage
  • THEORY.md with mathematical background
  • VALIDATION.md with NASA CEA comparison
  • CITATION.cff for academic citation
  • CONTRIBUTING.md for contributors

Technical Details

• 64 automated tests (pytest)
• Validated against NASA CEA within 3%
• Numba JIT compilation for <100ms calculation time

Full Changelog: https://github.com/SpaceEngineerSS/EnSim/commits/v1.0.0