Reduction Techniques, Part 1: Sub-modeling -- Applicability and Example · PDF filePart 1:...

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

“Efficient and Smart Solutions for Large Models”

Submodeling is the solution when only a portion of the model

matters

Submodeling: principles, examples & application to design variations

Submodeling principles

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

The coarse model provides accurate deformations but inaccurate stresses

The refined model(s) will provide accurate stresses

From the coarse model to the submodel through results mapping

Displacements are mapped to the common boundary

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

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

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.

Submodeling with ANSYS Workbench

Submodeling works for a variety of topologies and

nonlinear models as well

From a solid model to a solid model

Stress contour – full model

Stress contour – Submodel

From a shell model to a solid model

Initial geometry Defeatured shell model - deformations

Solid submodel - stresses

Nonlinearities can also be included

Plastic strain

Coarse model

Submodel (line) vs refined full model (cross)

You can perform design variations on

selected areas

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

Submodeling: principles, examples & application to design variations

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