  We introduce the RHDLPP, a flux-limited multigroup radiation hydrodynamics
numerical code designed for simulating laser-produced plasmas in diverse
environments. The code bifurcates into two packages: RHDLPP-LTP for
low-temperature plasmas generated by moderate-intensity nanosecond lasers, and
RHDLPP-HTP for high-temperature, high-density plasmas formed by high-intensity
laser pulses. The core radiation hydrodynamic equations are resolved in the
Eulerian frame, employing an operator-split method. This method decomposes the
solution into two substeps: first, the explicit resolution of the hyperbolic
subsystems integrating radiation and fluid dynamics, and second, the implicit
treatment of the parabolic part comprising stiff radiation diffusion, heat
conduction, and energy exchange. Laser propagation and energy deposition are
modeled through a hybrid approach, combining geometrical optics ray-tracing in
sub-critical plasma regions with a one-dimensional solution of the Helmholtz
wave equation in super-critical areas. The thermodynamic states are ascertained
using an equation of state, based on either the real gas approximation or the
quotidian equation of state (QEOS). Additionally, RHDLPP includes
RHDLPP-SpeIma3D, a three-dimensional spectral simulation post-processing
module, for generating both temporally-spatially resolved and time-integrated
spectra and imaging, facilitating direct comparisons with experimental data.
The paper showcases a series of verification tests to establish the code's
accuracy and efficiency, followed by application cases, including simulations
of laser-produced aluminum (Al) plasmas, pre-pulse-induced target deformation
of tin (Sn) microdroplets relevant to extreme ultraviolet lithography light
sources, and varied imaging and spectroscopic simulations.
