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Model and Load Pre-processing > Turbulent boundary layer loading

Stochastic workflow for turbulent boundary layer loading

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 ProcessModel and Load Pre-processing→type a name for the solution process. A node with this name appears in the Simulation Navigator.
2. Define the turbulent boundary layer (TBL) model. Use the Turbulent Boundary Layer Model command to specify the following:Affected regionFrequency rangeCorrelation spectrum and auto-spectrum modelsAdditional, optional spectrum-related parametersMethod to compute the TBL(Optional) Scale loads for unity power spectral density factorsRandom sampling to reduce the computation time when the model has many random load cases
3. Convert pressure to force. Use the Pressure to Force command to convert pressure to nodal forces for later processing by a solver, such as Simcenter Nastran.
4. (Optional) Validate the setup. Use the Validate command to validate the setup of the meta-solution. Validation results are displayed in the Information window.
5. Solve the meta-solution. Process the meta-solution with the Solve command.For more information on the solving process, see Solving the solution process.
6. 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 frequencies.You can display nodal force results.For information on creating a post-processing view, see Create and edit post-processing scenarios.
7. Extract nodal forces and apply to nodes. For the Simcenter Nastran solver, extract the forces 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, for example, the Force from External File command, because random sampling during decomposition generates multiple load cases, and 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.
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Stochastic workflow for turbulent boundary layer loading, Simcenter 3D 2021.1 Series

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Source: https://docs.sw.siemens.com/en-US/doc/289054037/PL20200601120302950.advanced/xid1589306_v1 · retrieved 2026-07-17