Selecting Physics Models

A physics model in Simcenter STAR-CCM+ defines how a physical phenomenon in a continuum is represented.

Essentially, physics models define the primary variables of the simulation (such as pressure, temperature, and velocity) and what mathematical formulation is used to generate the solution. An appropriate combination of models is necessary for the complete definition of a physics continuum.

Models in Simcenter STAR-CCM+ have varying levels of complexity and functionality, but their major purpose is to work with solvers to obtain a solution and to help present the information to you. The tasks of a typical model include making relevant field functions available and placing initial conditions and reference values in its continuum.

In situations where transport equations are required, the model provides these equations to the solvers. Therefore model properties often include coefficients relevant to the transport equations, as well as parameters relevant to the discretization approach.

Model settings, once made, are retained if models are deselected and are still available if the model is reselected.

To return model settings to their default values, right-click the model and select Restore Default Settings from the menu. This function is not available for models that have phase models under them.

In any physics continuum, phase, or phase interaction, the physics models are selected and changed using the Physics Model Selection dialog. This dialog assists you in recommending models and in selecting the appropriate combination of models and, for multiphase simulations, lets you create and configure the necessary phases and phase interactions.