Wall

class Wall

Bases: BoundaryBase

Wall class defines the wall boundary condition based on the inputs.

Example

• Wall with default wall function (BoundaryLayer) and prescribed velocity:

  >>> fl.Wall(
  ...     entities=geometry["wall_function"],
  ...     velocity = ["min(0.2, 0.2 + 0.2*y/0.5)", "0", "0.1*y/0.5"],
  ...     use_wall_function=fl.WallFunction(),
  ... )
  

• Wall with inner-layer wall function:

  >>> fl.Wall(
  ...     entities=volume_mesh["8"],
  ...     use_wall_function=fl.WallFunction(wall_function_type="InnerLayer"),
  ... )
  

• Wall with wall function and wall rotation:

  >>> fl.Wall(
  ...     entities=volume_mesh["8"],
  ...     velocity=WallRotation(
  ...       axis=(0, 0, 1),
  ...       center=(1, 2, 3) * u.m,
  ...       angular_velocity=100 * u.rpm
  ...     ),
  ...     use_wall_function=fl.WallFunction(),
  ... )
  

• Define isothermal wall boundary condition on entities with the naming pattern "fluid/isothermal-*":

  >>> fl.Wall(
  ...     entities=volume_mesh["fluid/isothermal-*"],
  ...     heat_spec=fl.Temperature(350 * fl.u.K),
  ... )
  

• Define isoflux wall boundary condition on entities with the naming pattern "solid/isoflux-*":

  >>> fl.Wall(
  ...     entities=volume_mesh["solid/isoflux-*"],
  ...     heat_spec=fl.HeatFlux(1.0 * fl.u.W/fl.u.m**2),
  ... )
  

• Define Slater no-slip bleed model on entities with the naming pattern "fluid/SlaterBoundary-*":

  >>> fl.Wall(
  ...     entities=volume_mesh["fluid/SlaterBoundary-*"],
  ...     velocity=fl.SlaterPorousBleed(
  ...         static_pressure=1.01e6 * fl.u.Pa, porosity=0.4, activation_step=200
  ...     ),
  ... )
  

• Define roughness height on entities with the naming pattern "fluid/Roughness-*":

  >>> fl.Wall(
  ...     entities=volume_mesh["fluid/Roughness-*"],
  ...     roughness_height=0.1 * fl.u.mm,
  ... )
  

Attributes

entities: EntityList[Surface, MirroredSurface, WindTunnelGhostSurface]

List of boundaries with the Wall boundary condition imposed.

name: str, optional

Name of the Wall boundary condition.

Default:

'Wall'

use_wall_function: WallFunction, optional

Wall function configuration. Set to WallFunction to enable wall functions. The default wall function type is 'BoundaryLayer'. Set to None to disable wall functions (no-slip wall).

Default:

None

velocity: SlaterPorousBleed | WallRotation | tuple[str, str, str] | Velocity.Vector3, optional

Prescribe a velocity or the velocity model on the wall.

Default:

None

heat_spec: HeatFlux | Temperature

Specify the heat flux or temperature at the Wall boundary.

Default:

HeatFlux()

roughness_height: Length.NonNegativeFloat64

Equivalent sand grain roughness height. Available only to Fluid zone boundaries.

Default:

0 * fl.u.m

Methods

check_wall_function_conflict()

Check no setting is conflicting with the usage of wall function

classmethod remap_symmetric_to_user_name(value)

Remap ‘symmetric’ ghost entity to user’s symmetry surface name for UDF backward compat.

classmethod ensure_surface_existence(value)

Ensure all boundaries will be present after mesher