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In the field of astrophysics, the term **hydrodynamics** is commonly
used for **fluid dynamics**, the study of forces and motion in bodies
of liquids or gases. In some scientific/engineering fields, the
term is used more specifically to refer to the dynamics of
non-compressible fluids (liquids), reserving the term **aerodynamics**
for the dynamics of gases. (The astrophysical usage possibly
resulted from instances where the formulae for non-compressible
fluids was used as a sufficient approximation of the dynamics of
gases in some astrophysical situations.)

Magnetohydrodynamics is the study of electrically conducting fluids (either liquid or gas) in motion in an electric field.

A simulations of fluid flows (**hydrodynamic model** or
**hydrodynamical model**) can be used for modeling
Earth oceans or atmosphere,
or the same for atmospheres of astronomical bodies.

Other subclasses of hydrodynamics, significant in some extreme situations (e.g., modeling, supernovae).

**relativistic hydrodynamics**(**RHD**)**relativistic magnetohydrodynamics**(**RMHD**)- radiation hydrodynamics
**radiation magnetohydrodynamics**(also**RMHD**)

adaptive mesh refinement (AMR)

AREPO

Castro

computational astrophysics

Enzo

finite element method (FEM)

flux

FORNAX

flux reconstruction (FR)

finite volume method (FVM)

gas flow

general circulation model (GCM)

Godunov scheme

gravity wave

HARM²

high resolution shock capture (HRSC)

hydrodynamic equations

hydrodynamic escape

MagIC

magnetohydrodynamics (MHD)

N-body simulation

Navier-Stokes equations (NS equations)

passive dust

permeability (κ)

planet formation

PLUTO Code

PROMETHEUS/VERTEX

RAMSES

radiation hydrodynamics (RHD)

semi-analytic model (SAM)

smoothed-particle hydrodynamics (SPH)