Checking your FEM acoustics model prior to solving

You can validate your Simcenter Nastran FEM acoustic or vibro-acoustic models prior to solving.

Model Setup checks at solver export

For general information about the Model Setup check command, see Checking the completeness of your model prior to a solve.

The Model Setup check command includes the following FEM model checks:

• FEM model checks — The following checks verify the correctness of the model for Simcenter Nastran FEM acoustic or vibro-acoustic solutions.FEM model checksDescriptionFluid mesh checksAll fluid element face normals must point outward (away from the material or fluid volume).AML requirementsThe AML must contain at least one fluid free face.The AML must contain only free faces of the selected fluid elements.The AML must be defined only on a convex surface.For more information, see Convex AML surface.If the AML contains more than one fluid free faces, the AML must be contiguous. It should be one domain. The contiguity of the AML is only through the free edges, and not through the nodes.An AML should not overlap another AML.The AML cannot have loads, constraints, acoustic absorbers, or surface-to-surface gluing.An AML free edge cannot lie in more than one infinite plane.AML free edges must be closed by any infinite planes.Infinite planes must be perpendicular to each other and must be perpendicular to one of the global axes (X, Y, or Z).AMLs cannot intersect and overlap an infinite plane.Only one AML can use the physical boundary as the radiation region.

• FEM solution check — The following check verifies the correctness of the solution for Simcenter Nastran FEM acoustic or vibro-acoustic solutions.FEM model checksDescriptionBoundary condition checkThe Enforced Acoustic Pressure loading must be applied on the fluid nodes.

For more information about validations for element orientation, see Checking and orienting the normals of 2D elements and Checking and orienting the normals of 3D element faces.

Where do I find it?

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed partSimcenter Nastran as the specified solverAcoustic or Vibro-Acoustic as the specified analysis type
Simulation Navigator	Right-click the Solution node → Model Setup Check

Learn more

Simcenter Nastran FEM acoustics

FEM acoustics workflow

FEM vibro-acoustic workflow

Electric motor vibro-acoustics analysis workflow

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Checking your FEM acoustics model prior to solving, Simcenter 3D 2021.1 Series

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