OpenJet¶

class acoular.environments.OpenJet¶

Bases: FlowField

Provides an analytical approximation of the flow field of an open jet.

See [2] for details.

Notes

This is not a fully generic implementation and is limited to flow in the x-direction only. No other directions are possible at the moment and flow components in the other direction are zero.

v0 = Float(0.0, desc='exit velocity')¶

Exit velocity at jet origin, i.e. the nozzle. Defaults to 0.

origin = CArray(dtype=float64, shape=(3,), value=array((0.0, 0.0, 0.0)), desc='center of nozzle')¶

Location of the nozzle center, defaults to the co-ordinate origin.

D = Float(0.2, desc='nozzle diameter')¶

Diameter of the nozzle, defaults to 0.2 .

l = Float(6.2, desc='flow establishment length')  # noqa: E741¶

Nondimensional length of zone of flow establishment (jet core length), defaults to 6.2

v(xx)¶

Provides the flow field as a function of the location. This is implemented here only for a jet in x-direction and the y- and z-components are set to zero.

Parameters:

xxarray of floats of shape (3, )

Location in the fluid for which to provide the data.

Returns:

tuple with two elements

The first element in the tuple is the velocity vector and the second is the Jacobian of the velocity vector field, both at the given location.