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Manuscript Title: MULTI: a computer code for one-dimensional multigroup radiation hydrodynamics.
Authors: R. Ramis, R. Schmalz, J. Meyer-ter-Vehn
Program title: MULTI
Catalogue identifier: ABBV_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 49(1988)475
Programming language: Fortran.
Computer: CRAY-XMP.
Operating system: COS.
RAM: 34K words
Word size: 64
Keywords: Inertial confinement, Fusion, Multigroup radiation Hydrodynamics, One-dimensional Implicit lagrangean code, Plasma physics.
Classification: 19.7.

Nature of problem:
In inertial confinement fusion and related experiments with lasers and particle beams energy transport by thermal radiation becomes important. Under these conditions, the radiation field strongly interacts with the hydrodynamic motion through frequency-dependent emission and absorption processes.

Solution method:
The equations of radiation transfer coupled with Lagrangean hydrodynamics are solved using a fully implicit numerical scheme. Frequency and angle dependence is included via a multigroup treatment. A time-splitting algorithm is adopted which feeds in all the groups successively during one hydrodynamic time step. Tabulated equation of state data, Planck and Rosseland opacities, and non-LTE properties of the matter are used which have to be generated externally.

Restrictions:
The MULTI code assumes one-dimensional plane symmetry. The target may consist of up to ten layers with up to three different materials. Laser energy deposition is modeled by inverse Bremsstrahlung absorption and a dump at the critical density. Electronic heat conduction is flux limited in the usual way. Radiation transport is treated stationary assuming that the matter velocity is much less than the speed of light. Scattering is neglected. There is a single matter temperature and opacities are assumed to depend only on this temperature, the density and frequency.

Unusual features:
Call to system routines DNAME0 and ERREXIT. These can be replaced or simply eliminated.

Running time:
On the CRAY-XMP the computing time is below 10**-4 s/(zone/timestep/ group) if the number of groups is not too small.