5. Applications

Each directory under exec/ builds one executable. The pages below document the main applications; Other applications lists the remaining ones.

Every application directory follows the same conventions:

• GNUmakefile – build options and the list of src_* libraries (Getting Started);

• inputs_* – example inputs files. Files named inputs_regression_* are short runs (a few time steps) that serve as regression tests and are a good starting point for new users;

• optionally, application-specific sources such as main_driver.cpp, Init.cpp (initial conditions selected by prob_type) and WritePlotFile.cpp. These override the library versions as described in Code Structure.

• 5.1. exec/hydro – incompressible fluctuating hydrodynamics
• 5.2. exec/multispec – low-Mach multispecies mixtures
• 5.3. exec/compressible_stag – compressible staggered-grid FHD
• 5.4. exec/reactDiff – stochastic reaction–diffusion
• 5.5. exec/DSMC – direct simulation Monte Carlo
• 5.6. exec/immersedIons – Brownian ions in a fluctuating fluid

5.7. Other applications

The following applications are also part of exec/. Each follows the conventions above; consult its inputs_* files and main_driver.cpp.

Directory	Topic
compressible	Collocated compressible FHD (src_compressible)
compressible_mui, compressible_stag_mui	Compressible FHD coupled to an external particle code through MUI
DSMC_granular, phononDSMC, phononDetector	Direct simulation Monte Carlo (src_particles, src_geometry)
immersed_boundary, cellbdytest_new	Particles and immersed boundaries coupled to the fluid
dean_kow	Dean–Kawasaki solvers (src_deankow)
FPU_FHD_cc, FPU_FHD_stag, FPU_chain, StochasticHeat, _1d_dk_hybrid, _1d_staggered_comp, thinFilm	Specialised and one-dimensional models
chemistry_testing, structFactTest, Ek_calculator, tests, tutorials, lib_hydro	Tests, analysis utilities and tutorials