Physics Continua

A physics continuum node, which has its own properties and pop-up menu, contains all of the model nodes in the object tree.

Generally, a physics continuum is defined as continuous and nonspatial such that no part of it is distinct or distinguishable from adjacent parts. This definition is also reflected in Simcenter STAR-CCM+, which logically interprets a continuum as a collection of models that represents the substance (fluid or solid) being simulated.

In keeping with the nonspatial characteristic, you can define physics continua in Simcenter STAR-CCM+ independently of the mesh and independently of existing regions. The models that are activated within a physics continuum determine the following:

• Whether the continuum is three-dimensional
• Whether it comprises a solid, liquid, or gas
• Whether it is stationary in time or transient
• The quantities that are defined within it

Certain models, when activated in a physics continuum, require the activation of other models in that continuum. For instance, once a physics continuum contains a liquid or a gas, it needs a flow model. Once it has a flow model, it needs a viscous model (inviscid, laminar, or turbulent). Once turbulence is activated within a fluid continuum, a turbulence model must be selected.

A simulation can contain many physics continua, each with its own name and properties. Each region must be associated with a physics continuum, and conversely each physics continuum can be associated with one or more regions.

In addition to the models comprising the physics continuum, the continuum also contains:

• Initial conditions
• Reference values