# Modeling techniques for Eulerian adaptive mesh domains in Abaqus/Explicit

 An Eulerian adaptive mesh domain: is used to model material flowing through the mesh; and typically has two Eulerian boundary regions, one inflow and one outflow, connected by Lagrangian and/or sliding boundary regions. The correct combination of mesh constraints and material boundary conditions applied to an Eulerian boundary region depends on whether the region acts as an inflow or an outflow boundary. The region types and mesh constraints assigned to the boundary regions that are connected to the Eulerian boundary regions must be chosen to simulate the correct physical behavior as well. The adaptive meshing technique in Abaqus/Explicit is robust if the mesh is underconstrained: the modeling techniques presented in this section are intended to provide guidance in properly defining Eulerian models. The following topics are discussed: