4.3.3. Volumetric Sources

The Source line applies a model for a volumetric source term for a given equation. See Governing Equations for more information on the role of sources in Aria. The general format of a source line command is as follows:

Source for [EQUATION] on [PART] = [MODEL] [MODEL ARGS...]

Here the EQUATION must be one declared with an EQ line including a SRC term defined at the same scope (i.e. Equation System or Region scope, see Equation Specification).

The PART corresponds to a mesh entity, and can include both single parts (e.g. block_1) as well as assemblies or mesh groups (see Assemblies and Mesh Groups).

Finally the MODEL defines how the source term is calculated. Note that multiple source lines may be defined for a given EQUATION / PART.

For example, a constant source for the energy equation can be defined as follows

# Scope: Sierra > Procedure > Aria Region
EQ Energy for Temperature on block_2 with Q1 using DIFF SRC
Source for energy on block_2 = constant value = 0.2

The reader is referred to the command reference for a comprehensive list of all possible equations and model options.