Acoustic sources from CFD results workflow

Before you perform the Model and Load Pre-processing task, a Simulation file must be the work and displayed part.

Step	Summary
1.	Create the solution process.	In the Simulation Navigator, create a new Model and Load Pre-processing solution process by right-clicking a simulation node→New Solution Process→Model and Load Pre-processing→type a name for the solution process. A node with this name appears in the Simulation Navigator.
2.	Import a result file.	Use the Input File dialog box to import external transient result files that contain unsteady flow field values, such as surface pressures, around a source region and an associated mesh. For example, the associated mesh represents the part of the CFD mesh boundaries, where the CFD software has exported the data. The input file must be in the CFD General Notation System (CGNS) format.When you choose a CGNS file, choose to import:All files associated with the first selected result file if each file represents a time step.Note: The software searches the directory of the previously selected result file and imports all result files with file names that match a specific File Name Separator.Subsequent files associated with the first selected result file if each file represents a time step.Note: The software searches the folder of the previously selected result file and imports all subsequent result files with file names that match a specific File Name Separator.
3.	Select the data types to be processed.	Click the Refresh icon to populate the data from the imported files to the fields in the data table. After the software populates the data, you can access and change the Target Storage Name. Unique target storage names let you track different loads, for example, in the Data Set field of the Surface Dipole dialog box and Variable (Results) filter in the Scenario Based Data-Visualization dialog box.
4.	Visualize imported results and an associated mesh.	After the import of the result file, you can:Visualize the associated mesh, also known as an intermediary mesh, with the right-click command Load Intermediary Mesh on the Input File node in the Simulation Navigator.Note: If necessary, use the Fit command to see the entire intermediary mesh in the work view.If you go back to step 2, load a different result file or change the units in the Unit System group of the Input File dialog box, the software unloads the intermediary mesh.Generate a contour plot of the results with a preconfigured post-processing view in the Scenario Based Data-Visualization dialog box and navigate through different time steps.
5.	Transfer mesh and load information.	You must use the Mesh Mapping command when you want to further process the mesh and load information from the result file in Pre/Post.Optionally, you can instruct the software to write the mesh mapping matrix to use it in other software for further processing.
6.	Map the result data from a source to a target mesh.	Edit the Mesh Mapping Data node to map nodes of the intermediary CFD mesh to the free element faces of an acoustic mesh.For more information, see Mapping of result data between meshes.
7.	Transform time-dependent loads into the frequency domain.	Use the Time Signal Processing command to convert input loading from time to frequency domain. When the input loading is already in the frequency domain, you can proceed to the next step.Note: If you used the File Loading option in the Input File dialog box to limit the number of results files to import, you can further limit the results files when you specify lower and upper samples with the Time Signal Processing command.Do not enable the Average Spectra after Segmentation options in the Time Signal Processing dialog box if you intend to use the pre-processed results in an acoustic or vibro-acoustic analysis and use the Subcase Averaging scenario for averaging results over selected subcases.For more information on time to frequency domain conversion, see Transforming time-domain to frequency.
9.	(Optional) Validate the setup.	Use the Validate command to validate the setup of the solution process. Validation results are displayed in the Information window.
10.	Solve the solution process.	Process the solution process with the Solve command.For more information on the solving process, see Solving the solution process.
11.	Visualize the preprocessed results.	Use a preconfigured post-processing view to generate a contour plot or XY plot of the pre-solver results and navigate through different time steps.You can display nodal force results.If you specified influencing nodes (number of nodes to be considered within the maximum search distance) during the mesh mapping step, you can verify the quality of the mesh mapping by inspecting the vectors of NumInfluencingNodes on Nodes data set in a contour plot.For information on creating a post-processing view, see Create and edit post-processing scenarios.
12.	Extract nodal pressure values and apply to nodes.	For the Simcenter Nastran solver, extract the nodal pressure values stored in the HDF5 result file and apply them to target nodes by using:The Create Load Recipe from Results command. You use this command instead of the Surface Dipole command when the HDF5 file contains multiple load cases, because in a solution the software can easily create subcases for these load cases from a load recipe.Note: When you attach the load recipe to an active solution or update a solution from the load recipe, make sure to choose the load condition type File Reference.For information on creating a load recipe from results, see Create a load recipe from solution process results.The Surface Dipole command. You enter the path to the HDF5 result file, choose the Subcase, and infer the Data Set with the Infer Data Set button.For more information, see Surface Dipole dialog box.
13.	Create or adjust the acoustic source parameters.	After you attach the load recipe to an active solution, update a solution from the load recipe, or create acoustic sources with the Surface Dipole command, you may have to create or adjust the acoustic source parameters.In the Surface Dipole Parameters group of the Surface Dipole dialog box, you create or adjust the parameters by clicking Create Modeling Object or Edit .You can choose compressible or incompressible flow type and control whether the software accounts for a numerical correction at the component edges of a truncated area that is selected as source domain.For more information, see Surface Dipole Parameters dialog box.

Learn more

Aeroacoustic simulation using surface dipole

Mapping of result data between meshes

Load recipes

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Related Topics

Selection recipes

Acoustic sources from CFD results workflow, Simcenter 3D 2021.1 Series

© 2020 Siemens

window.mainLanguage="en_US"

window.delivId=""

window.projectId=""

MathJax.Hub.Config({ TeX: { extensions: ["autoload-all.js"] }, tex2jax: { displayMath: [ ] }, "SVG": { scale: 125 } });