Model and Load Pre-processing solution process

You can use the Model and Load Pre-processing solution process to transform spatially varying loads and time-varying loads from external files to meshes of flexible structures and to convert these loads to loads for Simcenter 3D Acoustics BEM or Simcenter Nastran solutions.

You can initiate the Model and Load Pre-processing solution process from Pre/Post or Motion. For Motion users, initiating the process from Motion is quicker because you can perform the pre-processing tasks without switching applications and creating a new solution.

Fluid, acoustic, or force load transformations

You can transform the following to fluid, acoustic, or force loads for Simcenter Nastran SOL 108 or SOL 111 solutions:

• Deterministic hydrodynamic or aerodynamic loading from external computational fluid dynamics (CFD) simulations stored in CFD General Notation System (CGNS) format files.For more information, see External pressure loading.

• Deterministic frequency domain acoustic pressure loading from Simcenter 3D acoustic simulations.For more information, see External pressure loading.

• Deterministic force loading, such as frequency domain nodal forces, from external 3D electromagnetic simulations.For more information, see External pressure loading.

• Deterministic force loading from external 2D electromagnetic simulations.For more information, see Transform pre-computed 2D electromagnetic forces into loads.

You can also transform the following loads to fluid or acoustic loads for Simcenter Nastran SOL 108 solutions with the FEM Adaptive Order (FEMAO) method:

• Subsonic fluid excitations, such as from a fan or propeller.For more information, see Create a Fan Noise load and solution.

• Hydrodynamic or aerodynamic pressure on rigid boundaries of an acoustic mesh.Examples of rigid boundaries are the inner surface of a duct or the outer surface of an airframe component.

• Import velocity data from an input CGNS file to the acoustic model.For more information, see Steady state fluid velocity in an acoustic solution workflow.

Extract order cut data

You can extract order cut loads from external data from waterfall of frequency spectra format for use as excitations in structural and vibro-acoustic response solutions or for plotting the processed order cut data.

For more information, see Extracting order cut data.

CFD results transformation for defining acoustic properties

Use results such as temperature, density, pressure, and so on from a CFD-based file to define the acoustic properties of the fluid in a Simcenter Nastran SOL 108 or 111 acoustic analysis.

For more information, see Define acoustic properties of fluids with CFD results.

CFD results transformation for defining acoustic sources

Use pressure results from a CFD-based file to define surface dipole acoustic sources in a Simcenter Nastran SOL 108 or SOL 111 acoustic or vibro-acoustic analysis.

For more information, see Creating acoustic sources from CFD results.

Converting CFD results from Simcenter STAR-CCM+ CCM to CGNS format

You can export files from Simcenter STAR-CCM+ in CCM or CGNS format. However, Simcenter 3D supports the import of files in CGNS format only. Thus, you must use the CCM to CGNS converter to convert CCM files (.ccm) to CGNS (.cgns) files before you can import them into Simcenter 3D.

For more information, see CCM to CGNS converter.

Time-domain Motion results transformations

You can transform time-domain Motion results to frequency domain for use as load recipes in vibro-acoustic response solutions in both the FEM and BEM acoustic environments.

For more information, see Processing Motion results in Pre/Post for use in vibro-acoustic response.

Pre-computed structural vibrations transformation for defining enforced motion loads

You can transform ANSYS, Abaqus, Simcenter Samcef, and so on pre-computed structural vibrations for use as enforced motion loads in structural and vibro-acoustic response solutions in the FEM environment.

For more information, see External enforced motion loading.

Pre-computed rotational vibrations transformation for defining enforced motion loads

You can map pre-computed vibrations from a rotating mesh to a stationary mesh and use them as enforced motion loads in vibro-acoustic response solutions in the FEM environment. The pre-computed vibrations must be created by a Simcenter Nastran, ANSYS, Abaqus, or other supported solver.

For more information, see External enforced motion loading.

Modal results transformation for defining mode sets

You can import pre-computed displacement and rotation modes from ANSYS, Abaqus, Nastran, Simcenter Testlab, and so on files and map the modal mass and damping from the imported (source) mesh to a model (target) mesh. The Model and Load Pre-processing solution process can perform the mapping even without matching node IDs between the source and target nodes. After you solve the solution process, the software stores the mapped modes in an HDF5 file in binary format for use as mode sets in vibro-acoustic response solutions in the BEM and FEM environment.

For more information, see Replace a FEM file with a mode set or FRF set.

The Model and Load Pre-processing solution process provides an efficient, integrated transformation of external loads and converts data into a compact binary format.

Additionally, this solution process lets you apply stochastic pressure loads based on pre-defined or user-defined turbulent boundary layer (TBL) models on specific regions for a Simcenter Nastran random analysis.

For more information, see Turbulent boundary layer loading.

A typical application of this solution process includes transforming deterministic Simcenter STAR-CCM+ aerodynamic pressures that cause an automotive side window to vibrate and use these loads in a vibro-acoustic solution to examine the vibro-acoustic response at a driver's ear to the structural excitation.

When you create this solution process, the software creates a Model and Load Pre-processing node in the Simulation Navigator and may contain various data processing nodes, such as Fan Noise Segmentation, Time Signal Processing, Time to Waterfall, Pressure to Force, and so on.

Converting results to universal file format

The Model and Load Pre-Processing solution process replaces the New Data Processing command from previous releases, which transformed the data sources used as input to post-processing scenarios. You may still find the New Data Processing command helpful for converting results to I-deas universal file (*.UNV) file format. It is available by setting the NX_CAE_ENABLE_DPM environment variable to ON.

Where do I find it?

Application	Pre/Post
Prerequisites	A Simulation file as the work and displayed partFluid, acoustic, or force loads transformationsSimcenter Nastran as the specified solverStructural, Acoustic, or Vibro-Acoustic as the specified analysis typeOne of the following as the specified solution type:SOL 108 Direct Frequency ResponseSOL 111 Modal Frequency ResponseExtract order cut dataSimcenter Nastran as the specified solverStructural or Vibro-Acoustic as the specified analysis typeOne of the following as the specified solution type:SOL 108 Direct Frequency ResponseSOL 111 Modal Frequency ResponseCFD results transformation for defining acoustic propertiesSimcenter Nastran as the specified solverAcoustic or Vibro-Acoustic as the specified analysis typeOne of the following as the specified solution type:SOL 108 Direct Frequency ResponseSOL 111 Modal Frequency ResponseCFD results transformation for defining acoustic sourcesSimcenter Nastran as the specified solverAcoustic or Vibro-Acoustic as the specified analysis typeOne of the following as the specified solution type:SOL 108 Direct Frequency ResponseSOL 111 Modal Frequency ResponseTime-domain Motion results transformationsSimcenter NastranVibro-Acoustic as the specified analysis typeOne of the following as the specified solution type:SOL 108 Direct Frequency ResponseSOL 108 Vibro-Acoustic Transfer Vector ResponseSOL 111 Modal Frequency ResponseSimcenter 3D Acoustics BEMIndirect Vibro-Acoustic as the specified analysis typePressure loads based on TBL modelsSimcenter Nastran as the specified solverAcoustic or Vibro-Acoustic as the specified analysis typeOne of the following as the specified solution type:SOL 108 Direct Frequency ResponseSOL 111 Modal Frequency ResponseSubcase-Random as the specified solution stepPre-computed structural vibrations transformation for defining enforced motion loadsSimcenter Nastran as the specified solverStructural or Vibro-Acoustic as the specified analysis typeOne of the following as the specified solution type:SOL 108 Direct Frequency ResponseSOL 111 Modal Frequency ResponsePre-computed rotational vibrations transformation for defining motion loadsSimcenter Nastran as the specified solverVibro-Acoustic as the specified analysis typeOne of the following as the specified solution type:SOL 108 Direct Frequency ResponseSOL 111 Modal Frequency ResponseModal results transformation for defining mode setsSimcenter Nastran as the specified solverVibro-Acoustic as the specified analysis typeOne of the following as the specified solution type:SOL 108 Direct Frequency ResponseSOL 111 Modal Frequency ResponseSimcenter 3D Acoustics BEM as the specified solverIndirect Vibro-Acoustic as the specified analysis typeSimcenter 3D Noise and Vibration as the specified solver
Simulation Navigator	Right-click a Simulation file→New Solution Process→Model and Load Pre-processing

How do I

Define acoustic properties of fluids with CFD results

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Solving the solution process

Remote solving workflow (Linux)

Steady state fluid velocity in an acoustic solution workflow

Transforming time-domain to frequency

Converting frequency data to time domain

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Model and Load Pre-processing in the Simulation Navigator

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Related Topics

Mean velocity flow mapping in an acoustic solution

Model and Load Pre-processing solution process, Simcenter 3D 2021.1 Series

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