FEM acoustics workflow

Step	Summary	Detailed help topic
1.	Create a FEM file	Create a FEM file using the Simcenter Nastran Fem template. Set the Solver to Simcenter Nastran and set the Analysis Type to Acoustic.	Create a new FEM file
2.	Define the fluid	Create the 3D acoustic fluid mesh.Create the acoustic fluid material. For each mesh collector, choose the appropriate acoustic fluid material and physical properties matching the analysis and element type. Note: Your meshing steps will be different depending on whether you are performing an interior or exterior acoustic analysis.	Meshing for Simcenter Nastran FEM acoustic analysisFluid materials for acoustics analyses
3.	Create a Simulation file	Create a Simulation file using the Simcenter Nastran Acoustic simulation template.	Create a new Simulation file
4.	Create the solution	Create a new solution with Solver set to Simcenter Nastran, Analysis Type set to Acoustic, and Solution Type set to the solution type of your choice.Alternatively, you can create a solution directly from a predefined load recipe, to apply loads from an external file to the simulation model.	Create or modify a solutionCreate a solution from a load recipe
5.	Create an AML (exterior acoustics)	Create an automatically matched layer (AML) to define a reflection-less artificial layer that absorbs outgoing waves regardless of their frequency and angle of incidence.	Create an automatically matched layer
6.	Create microphone mesh	Create a microphone mesh to measure sound inside or outside the fluid.	Create microphones
7.	Define forcing frequencies	Add Forcing Frequencies to solution subcases to excite the model.	Specifying forcing frequencies for a frequency response analysis
8.	Create acoustic absorbers	You can define acoustic surface impedance (or its reciprocal admittance) by applying acoustic absorber simulation objects on the free faces of fluid elements. Or, you can use porous materials to model 3D acoustic absorbers.	Create an acoustic absorberPorous materials
9.	Request the types of results to output	The Acoustic Output Requests modeling object specifies the types of results to recover from the solution: acoustic intensity, acoustic power, acoustic pressure, acoustic particle velocity, and modal contribution.You can specify output requests both for the solution and for individual solution steps.	Requesting output for Nastran analyses
10.	Request modal contribution responses	You can analyze the contribution of a given mode to the response at a given node and degree of freedom.	Define modal contribution parameters
11.	Create acoustic constraints	Add acoustic constraints in the Simulation file as needed.You can add constraints at the solution level or to individual steps.	Create acoustic constraints
12.	Create acoustic loads	Add acoustic loads (enforced acoustic pressure, or acoustic source) in the Simulation file as needed.You can add loads only at the solution level. You can organize loads within load sets.	Create acoustic sourcesUsing fields and expressions to define boundary conditions
13.	Define the acoustic solution parameters	In the acoustic solution, specify the Real Eigenvalue Method, number of desired modes, and frequency range of modes.	Eigenvalue Extraction Methods
14.	Solve the solution	Solve the solution to generate the analysis results.	Solve the model
15.	Post-process the results	Use post-processing tools, such as contour plots and XY graphing, to analyze your results.You can display acoustic nodal pressure results with dB scaling.Nodal XY results are grouped by response node, response type, degree of freedom, and subcase.	Create contour plotsScaling acoustic resultsAnalyzing vibro-acoustic contribution dataPlot vibro-acoustic contribution data

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FEM acoustics workflow, Simcenter 3D 2021.1 Series

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