  The document describes a numerical algorithm to simulate plasmas and fluids
in the 3 dimensional space by the Euler method, in which the spatial meshes are
fixed to the space. The plasmas and fluids move through the spacial Euler mesh
boundary. The Euler method can represent a large deformation of the plasmas and
fluids. On the other hand, when the plasmas or fluids are compressed to a high
density, the spatial resolution should be ensured to describe the density
change precisely. The present 3D Euler code is developed to simulate a nuclear
fusion fuel ignition and burning. Therefore, the 3D Euler code includes the DT
fuel reactions, the alpha particle diffusion, the alpha particle deposition to
heat the DT fuel and the DT fuel depletion by the DT reactions, as well as the
thermal energy diffusion based on the three-temperature compressible fluid
model.
