ushma 1.1.0

Thermodynamics simulation — heat transfer, entropy, equations of state, thermal properties
Documentation

Ushma

Ushma (Sanskrit: ऊष्मा — heat, thermal energy) — Thermodynamics simulation for AGNOS

Heat transfer, entropy, equations of state, phase transitions, thermodynamic cycles, numerical solvers, chemical and statistical thermodynamics.

Built on hisab for math foundations and impetus for body contacts.

MSRV: 1.89 · Edition: 2024 · License: GPL-3.0-only

Installation

[dependencies]
ushma = "1"

Features

Feature Default Description
transfer yes Conduction, convection, radiation, fins, heat exchangers, view factors, dimensionless numbers
state yes Ideal gas, van der Waals, Redlich-Kwong, Peng-Robinson, virial EOS, mixture rules
entropy yes Entropy change, Carnot efficiency/COP, Helmholtz/Gibbs free energy, entropy of mixing
material yes 10 built-in materials with thermal properties at ~300 K
phase yes Phase transitions, Clausius-Clapeyron, 8 substances with critical/triple points
cycle yes Otto, Diesel, Brayton, Rankine, refrigeration cycles, T-s/P-v diagrams
numerical yes 1D/2D finite difference (explicit, Crank-Nicolson), thermal networks, adaptive stepping
chem yes Hess's law, Gibbs energy of reaction, equilibrium constants, Van't Hoff, adiabatic flame temperature
stat yes Boltzmann distribution, partition functions, Maxwell-Boltzmann speeds, Einstein/Debye solid Cv
steam no Saturated + superheated steam tables (IAPWS-IF97), quality calculations
ai no Daimon/hoosh agent integration (network dependencies)
logging no Structured logging via USHMA_LOG env var
full — Enables all features

Architecture

ushma (this crate)
  ├── hisab (math: vectors, geometry, calculus)
  └── impetus (physics: rigid body dynamics, collision)

Consumers:
  kiran       ──→ ushma (thermal simulation in game worlds)
  joshua      ──→ ushma (heat engines, thermal experiments, climate models)

Quick Start

use ushma::transfer;
use ushma::state;
use ushma::entropy;
use ushma::material::COPPER;

// Fourier's law: heat conduction through a copper wall
let q = transfer::conduction(COPPER.conductivity, 0.01, 373.15, 293.15, 0.1).unwrap();

// Ideal gas law at STP
let v = state::ideal_gas_volume(1.0, state::STANDARD_TEMP, state::ATM).unwrap();

// Carnot efficiency
let eta = entropy::carnot_efficiency(500.0, 300.0).unwrap(); // 40%

// Otto cycle
use ushma::cycle;
let otto = cycle::otto_cycle(300.0, 101_325.0, 8.0, 50_000.0, 1.4, 1.0).unwrap();
assert!(otto.efficiency > 0.5);

// Peng-Robinson equation of state
let p = state::peng_robinson_pressure(300.0, 0.02241, 304.13, 7_375_000.0, 0.224).unwrap();

// Adiabatic flame temperature
use ushma::chem;
let t_flame = chem::adiabatic_flame_temperature(
    &[(1.0, &chem::CH4), (2.0, &chem::O2), (7.52, &chem::N2)],
    &[(1.0, &chem::CO2), (2.0, &chem::H2O_GAS), (7.52, &chem::N2)],
    298.15,
).unwrap();

Modules

Module Key items Description
transfer conduction, convection, radiation, fin_*, lmtd_*, effectiveness_*, reynolds_number, nusselt_*, view_factor_* Heat transfer, fins, exchangers, dimensionless numbers
state ideal_gas_*, van_der_waals_*, redlich_kwong_*, peng_robinson_*, virial_*, kays_rule_*, GasData Equations of state, real gas models, mixtures
entropy carnot_efficiency, carnot_cop_*, helmholtz, gibbs, entropy_of_mixing Thermodynamic potentials, second law
material ThermalMaterial, COPPER...DIAMOND, ALL_MATERIALS 10 reference materials at ~300 K
phase SubstanceData, Phase, clausius_clapeyron_*, heat_of_*, phase_at Phase transitions, 8 substances
steam saturated_by_*, superheated_lookup, quality_from_*, wet_steam_properties IAPWS-IF97 steam tables
cycle otto_cycle, diesel_cycle, brayton_cycle, rankine_cycle, refrigeration_cycle, cycle_*_diagram Thermodynamic cycles, diagrams
numerical ThermalGrid1D, ThermalGrid2D, ThermalNetwork, BoundaryCondition FDM solvers, thermal networks
chem reaction_enthalpy, reaction_gibbs, equilibrium_constant, vant_hoff_k, adiabatic_flame_temperature Chemical thermodynamics
stat boltzmann_*, partition_*, maxwell_boltzmann_*, einstein_cv, debye_cv, equipartition_* Statistical mechanics

Examples

cargo run --example basic_thermo --features transfer,state,material
cargo run --example heat_engine --features cycle,state,entropy
cargo run --example building_thermal --features transfer,material,numerical
cargo run --example cooling_system --features transfer,material
cargo run --example phase_change --features phase,transfer

Building

cargo build --all-features
cargo test --all-features
cargo bench --all-features

Documentation

License

GPL-3.0-only — see LICENSE.