APORT

APORT

APORT, PortNum, Label, KCN, PRES, PHASE, --, VAL1, VAL2, VAL3, VAL4
Specifies input data for plane wave and acoustic duct ports.

SOLUTION: Misc Loads

Compatible Products: – | – | – | Enterprise | Ent PP | Ent Solver | –

PortNum

Port number. This number is associated with an exterior port or interior port previously specified by the SF and BF family of commands, respectively. The number must be between 1 and 50.

Label

PLAN	—	Incident plane wave.
RECT	—	Rectangular duct.
CIRC	—	Circular duct.
COAX	—	Coaxial duct.
LIST	—	List the port settings. If `PortNum` = ALL, list the port settings for all defined ports.
DELE	—	Delete defined ports. If `PortNum` = ALL, delete all defined ports.

KCN

A previously-defined local (KCN >10) or global (KCN = 0) Cartesian coordinate system number used to specify the geometric properties of the duct. Defaults to the global Cartesian coordinate system (0). The local Z-direction must be the direction of wave propagation. The origin of the local coordinate system must be centered about the face of the duct port without considering symmetry.

PRES

Zero-to-peak amplitude of the pressure. If blank, the port will appear as a matching impedance.

PHASE

Phase angle of the applied pressure in degrees. Defaults to 0.

--

Unused field.

VAL1, VAL2, VAL3, VAL4

Additional input. The meaning of VAL1 through VAL4 varies depending on the specified Label.

Label = PLAN:

*`VAL1`*	—	angle from positive X-axis to positive Y-axis in the local Cartesian coordinates (`KCN`).
*`VAL2`*	—	angle away from positive Z-axis in the local Cartesian coordinates (`KCN`).
*`VAL3-VAL4`*	—	Not used.

Label = RECT:

*`VAL1`*	—	Width of the rectangular duct.
*`VAL2`*	—	Height of the rectangular duct.
*`VAL3`*	—	Mode index for pressure variation along the width (defaults to 0).
*`VAL4`*	—	Mode index for pressure variation along the height (defaults to 0).

Label = CIRC:

*`VAL1`*	—	Radius of the circular duct.
*`VAL2`*	—	Not used.
*`VAL3`*	—	Mode index for pressure variation along the azimuth (defaults to 0).
*`VAL4`*	—	Mode index for pressure variation along the radii (defaults to 0).

Label = COAX:

*`VAL1`*	—	Inner radius of the coaxial duct.
*`VAL2`*	—	Outer radius of the coaxial duct.
*`VAL3`*	—	Mode index for pressure variation along the azimuth (defaults to 0).
*`VAL4`*	—	Mode index for pressure variation along the radii (defaults to 0).

Notes

Use the APORT command to launch a specified analytic acoustic mode into a guided duct.

The low-order FLUID30 element does not support the higher modes in the coaxial duct (Label = COAX).

For more information, see Specified Mode Excitation in an Acoustic Duct in the Acoustic Analysis Guide, and Analytic Port Modes in a Duct in the Mechanical APDL Theory Reference.

Menu Paths

This command cannot be accessed from a menu.