Reduction Techniques, Part 1: Sub-modeling -- Applicability and Example · PDF filePart 1: Sub-modeling -- Applicability and Example “Efficient and Smart Solutions for ... Reduction

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Reduction Techniques, Part 1: Sub-modeling -- Applicability and Example

“Efficient and Smart Solutions for Large Models”

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Submodeling is the solution when only a portion of the model

matters

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Submodeling: principles, examples & application to design variations

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Submodeling principles

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Start from a coarse solution and increase accuracy only in selected areas

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The coarse model provides accurate deformations but inaccurate stresses

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The refined model(s) will provide accurate stresses

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From the coarse model to the submodel through results mapping

Displacements are mapped to the common boundary

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Solving two models can be faster than solving a very detailed one

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General Procedure

1. Create and analyze the initial model

2. Create the submodel

3. Perform cut boundary interpolation

4. Analyze the submodel

5. Verify that the distance between the cut boundaries and the stress concentration is adequate

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Good practice: Verify the cut-boundary distance

Compare path plots at that location between the initial model and submodel.

Use the query option.

List the results.

Etc.

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Submodeling with ANSYS Workbench

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Submodeling works for a variety of topologies and

nonlinear models as well

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From a solid model to a solid model

Stress contour – full model

Stress contour – Submodel

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From a shell model to a solid model

Initial geometry Defeatured shell model - deformations

Solid submodel - stresses

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Nonlinearities can also be included

Plastic strain

Coarse model

Submodel (line) vs refined full model (cross)

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You can perform design variations on

selected areas

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Re-computation of the full model may not be necessary for limited variations

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Submodeling: principles, examples & application to design variations

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Q & A