The small gap you're encountering when extracting the internal volume in your pressure tank model with tubes is likely due to slight geometric imperfections or tolerances between the separate parts in your CAD software. Here are a few approaches you can try to fix this:
* Merge Parts in CAD (Recommended):
* If possible, go back to your original CAD model and permanently merge the pressure tank and tube parts into a single solid body. This eliminates gaps and ensures a watertight internal volume for accurate extraction.
* Refine Mesh (if merging is not feasible):
* If merging parts in CAD isn't an option, try refining the mesh around the pressure tank and tube interface in your simulation software. A finer mesh can better capture the intended geometry and potentially reduce the gap during volume extraction.
* Tolerance-Based Shutoff (advanced):
* Some simulation software might offer options to define a small tolerance value during the volume extraction process. This tolerance would essentially ignore gaps smaller than the specified value, resulting in a more continuous internal volume. However, use this approach with caution as it might introduce slight inaccuracies in the extracted volume. Consult your software's documentation for specific instructions on implementing a tolerance-based shutoff.
* Surface Remeshing (advanced):
* In some cases, you might be able to manually remesh the surface of the pressure tank and tubes to create a more watertight connection before volume extraction. This can be a complex process depending on your software and requires a good understanding of meshing techniques.
By trying these methods in the order listed, you should be able to eliminate the small gap and obtain a more accurate representation of the internal volume in your pressure tank model. If you're using a specific simulation software, consider searching its documentation or online forums for more tailored advice on gap handling during volume extraction.
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