FEMAO convected flow workflow

Performing a Simcenter Nastran acoustic solution with the effects of convected flow (fluid flow) is a two-step process. To create the solution, do the following:

1. Create a Potential Flow Solution.

2. Create a SOL108 Direct Frequency Response solution and include the Potential Flow Solution results.

Step	Summary	Detailed help topic
Potential Flow Solution Workflow
1.	Open or create a Simulation file.	Create or open a Simulation file using the Simcenter Nastran Acoustic simulation template.	Create a new Simulation fileCreate a Simulation file using the Simcenter Nastran Acoustic simulation template.
2.	On theAcoustics and Vibration tab, selectPotential Flow.	On the Acoustics and Vibration tab, select Potential Flow .
3.	Create boundary conditions.	Right-click the Potential Flow solution → Add Boundary Condition.Select Flow Potential Boundary Condition or Flow Velocity Boundary Condition.	Flow Potential Boundary Condition dialog boxDefine the potential flow.Note: The potential flow is a surface normal potential where positive normals are facing away from the acoustic mesh. If the flow is into the mesh a negative potential flow value is required.Flow Velocity Boundary Condition dialog boxDefine the flow velocity.Note: The flow velocity is a surface normal velocity where positive normals are facing away from the acoustic mesh. If the flow is into the mesh a negative flow velocity value is required.
4.	Solve the solution.	Right-click the Potential Flow solution → Solve.
5.	Use Post-Processing Scenario to examine the results.	Right-click the solution Results → Post-Processing ScenarioTip: Nodal XY results are grouped by response node, response type, degree of freedom, and subcase.	Scenario-based post-processing

Step	Summary	Detailed help topic
SOL108 Direct Frequency Response Solution Workflow
1.	Create a SOL108 Direct Frequency Response Solution.	Create a SOL108 Direct Frequency Response acoustic solution.
2.	Enable FEMAO on the solution.	On the solution Bulk Data group, select Enable Adaptive Order for Acoustic Elements .
3.	Create convection flow velocity.	In the new solution, selectSimulation Objects, New Simulation Objects, and select Convection Flow Velocity.In the Convection Flow Velocity dialog box, open the .sc_h5 file to import the Potential Flow solution results.	Convection Flow Velocity dialog box
4.	Create otherNew Simulation Objects as needed.	Add simulation objects to completely define the acoustic solution.Acoustic AbsorberAutomatically Matched LayerTransfer AdmittanceAnechoic End DuctAcoustic Temperature MappingNote: Acoustic Continuity is not available.Create Convection Flow Velocity at fluid inlet and outlet.	Acoustic Absorber dialog boxAutomatically Matched Layer dialog boxTransfer Admittance dialog box (Simcenter Nastran)Specific Duct Mode / Distributed Duct Mode / Anechoic End dialog boxAcoustic Temperature Mapping dialog boxConvection Flow Velocity dialog box
5.	Create microphone mesh.	Create a microphone mesh to measure sound inside or outside the acoustic fluid.	Create microphones
6.	Define forcing frequencies.	Add Forcing Frequencies to specify the solution frequencies.	Specifying forcing frequencies for a frequency response analysis
7.	Request the types of results to output.	The Acoustic Output Requests modeling object specifies the types of results to recover from the solution:Acoustic intensityAcoustic powerAcoustic pressureAcoustic particle velocity	Requesting output for Nastran analyses
8.	For the solution edit the advanced solver options.	Edit the Advanced Solver Options. Set the units to be:(Force)(Length)(Mass) = (N)(m)(kg)Specify Temperature Unit = Kelvin	Export Simulation/Advanced Solver Options dialog box—Nastran
9.	Solve the solution.	Solve the solution to compute the analysis results.	Solve dialog box
10.	Use Post-Processing Scenario to examine the results.	Right-click the solution Results → Post-Processing Scenario.Tip: Nodal XY results are grouped by response node, response type, degree of freedom, and subcase.	Scenario-based post-processing

Learn more

Finite Element Method Adaptive Order (FEMAO) solutions

Solution stabilization options

Steady state fluid velocity in an acoustic solution workflow

Using viscoelastic materials in FEMAO solutions

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FEMAO convected flow workflow, Simcenter 3D 2021.1 Series

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