Imported Model is All Surface Bodies? SpaceClaim One Trick to Convert to Solid, Simple and Efficient!-allcae

Problem Description

Using SpaceClaim, you can process some surface body models and convert them into solid models, which is suitable for using the solid model as a fluid domain model for subsequent CFD calculations. In this process, you can mainly use a repair function called stitch in SpaceClaim, as well as a modeling function called Fill.

When importing external formats such as stl, stp, igs into SpaceClaim, there often appear

problems such as surface fragmentation, boundary gaps, tiny overlaps, and missing faces

, which make it impossible to generate a solid. Stitch is the first choice for repairing such problems. The Fill function is based on

boundary contours

, automatically fitting and generating one or more smooth surfaces to completely seal the model gaps.

Case Study

Using the Geometry module of the ANSYS Workbench platform, import an external stp model.

After entering SpaceClaim, it is found that this stp model is a surface type pipe model, containing 4 surface patches.

The model only contains the outer wall surface of the pipe.

Using the cross-section function, you can clearly see that the model only has a shell, without internal solid parts. For this type of model, if you want to obtain the internal solid part of the pipe, there are actually multiple methods. Here we introduce a relatively simple and fast method.

Because the current model contains 4 surface patches, first use the Stitch function in Repair to stitch these 4 surface bodies together.

Highlight the areas in the model that can currently be stitched.

After completing the stitch, the model has only one surface body left, which means the gaps inside the model have been eliminated. On this basis, it becomes easier to generate a solid.

Use the Fill function in Design.

Fill the inlet and outlet at both ends of the pipe, which is equivalent to sealing both ends of the pipe.

After sealing is completed, the solid model is generated.

Converting imported surface body models to solids in SpaceClaim, the core approach is to first repair and close the surfaces, then generate the solid. If there are tiny gaps, use the

Stitch

function, set reasonable tolerances to merge adjacent surfaces into a whole. If there are obvious holes or large gaps, such as the pipe opening in this case, you need to use the

Fill

tool to complete the missing surfaces, ensuring the model forms a closed surface body with no openings. After completing the repair, you can basically convert the surface body model into a solid model. The entire process follows the principle of stitching small gaps and filling large holes, to meet subsequent simulation and modeling requirements.

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