The Compressible Potential Flow (cpf) interface (
), found under the
Acoustics>Aeroacoustics branch (
), is used to compute the velocity potential and density in a compressible potential flow model. Derived values include the associated pressure, velocity, and temperature in the flow. In a compressible potential flow model the flow is assumed to be represented by an ideal barotropic, irrotational fluid at constant entropy, that is, the fluid is also inviscid. The physics interface is used for modeling the background mean flow used as input to
The Linearized Potential Flow, Frequency Domain Interface or
The Linearized Potential Flow, Transient Interface.
When this physics interface is added, these default nodes are also added to the Model Builder —
Compressible Potential Flow,
Slip Velocity, and
Initial Values. For axisymmetric models an
Axial Symmetry node is also added.
Then, from the Physics toolbar, add other nodes that implement, for example, boundary conditions and sources. You can also right-click
Compressible Potential Flow to select physics features from the context menu.
The Label is the default physics interface name.
The Name is used primarily as a scope prefix for variables defined by the physics interface. Refer to such physics interface variables in expressions using the pattern
<name>.<variable_name>. In order to distinguish between variables belonging to different physics interfaces, the
name string must be unique. Only letters, numbers, and underscores (_) are permitted in the
Name field. The first character must be a letter.
The default Name (for the first physics interface in the model) is
cpf.
This physics interface defines two dependent variables (field), the Mean flow velocity potential Phi and the
Density rho. The name can be changed but the names of fields and dependent variables must be unique within a model.
Select the discretization order for the Mean flow velocity potential and the
Density dependent variables. The default is
Quadratic for both.