Automatically Matched Layer dialog box

Name
Name	Sets the name of the AML.
Description	Sets a description for the AML.
Destination Folder
Simulation Object Container	Specifies the folder in the Simulation Object Container in which the AML is created.Root is the Simulation Object Container folder. The list includes the root container and any folders that you create with the New Folder command in the Simulation Object Container.
Folder Manager	Opens the Folder Manager dialog box. You can select a folder or create a new folder.To create a new folder, right-click a folder and choose New Folder.
Automatically Matched Layer Surfaces
Automatically Matched Layer Surface	Specifies an AML region.You can create a new region, select a region, or edit a region.Click Edit to modify an existing AML.
Create Region	Opens the Region dialog box.You can create a new AML region, select the fluid element faces from the acoustic model, or select an existing group of element faces by selecting the Group Reference check box in Region dialog box.For more information, see Group Reference options.
Radiation Surface	Specifies the radiating surface.You can select the surfaces to use to compute acoustic radiation. Microphone meshes outside the fluid mesh are used to post process the acoustic radiation results.Automatically Matched Layer Surface — Specifies the AML surface as a radiation surface.Physical Boundary — Specifies the physical boundary as a radiation surface.The physical boundary contains all fluid faces minus the AML surface and infinite plane. None — Specifies the AML surface and the physical boundary as a non-radiation surface. Any sound that is exterior to the fluid domain is not computed.Note: If you specify the radiation surface as None, infinite planes are not applicable.
Automatically Matched Layer Settings
Number of Layers	Sets the number of layers in the extrusion direction that the solver adds. The layers in an AML absorb any outgoing sound waves.The range of this value is 5 through 16. Increasing the number of layers may increase accuracy slightly at the expense of a longer solution time.
Infinite Planes
Infinite Plane	Specifies one or more planes that are unbounded.When you specify a radiation surface, you can also define infinite planes to model reflecting surfaces, such as a hard wall, ground, or a pressure release surface (for underwater acoustics). Infinite planes can be used to specify a symmetric (zero velocity, reflective) or anti-symmetric (zero pressure, non-reflective) boundary condition.You can create a new infinite plane, select an existing infinite plane, or edit an infinite plane. You can define up to three infinite planes in each AML simulation object.Note: The infinite planes must be perpendicular to one of the three absolute coordinate system directions (X, Y, and Z), and therefore perpendicular to each other. However, an infinite plane does not need to contain the origin of the absolute coordinate system.Click Edit to modify an existing infinite plane region.
Create Region	Opens the Region dialog box.You can create a new infinite plane region, select the fluid element faces from an acoustic model or select an existing group of element faces by selecting the Group Reference check box in Region dialog box.For more information, see Group Reference options.

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Meshing for FEM acoustic analysis

Modeling exterior acoustic problems using automatically matched layers

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Automatically Matched Layer dialog box, Simcenter 3D 2021.1 Series

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