APORT

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

SOLUTION: Misc Loads

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

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