## An interface reconstruction method based on an analytical formula for 3D arbitrary convex cells

## Abstract

In this study, we are interested in an interface reconstruction method for 3D arbitrary convex cells that could be used in multi-material flow simulations for instance. We assume that the interface is represented by a plane whose normal vector is known and we focus on the volume-matching step that consists in finding the plane constant so that it splits the cell according to a given volume fraction. We follow the same approach as in the recent authors' publication for 2D arbitrary convex cells in planar and axisymmetrical geometries, namely we derive an analytical formula for the volume of the specific prismatoids obtained when decomposing the cell using the planes that are parallel to the interface and passing through all the cell nodes. This formula is used to bracket the interface plane constant such that the volume-matching problem is rewritten in a single prismatoid in which the same formula is used to find the final solution. Finally, the proposed method is tested against an important number of reproducible configurations and shown to be at least five times faster.

- Authors:

- Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Fluid Dynamics and Solid Mechanics (T-3)

- Publication Date:

- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)

- OSTI Identifier:
- 1325632

- Alternate Identifier(s):
- OSTI ID: 1359282

- Report Number(s):
- LA-UR-15-20420

Journal ID: ISSN 0021-9991

- Grant/Contract Number:
- AC52-06NA25396

- Resource Type:
- Accepted Manuscript

- Journal Name:
- Journal of Computational Physics

- Additional Journal Information:
- Journal Volume: 305; Journal ID: ISSN 0021-9991

- Publisher:
- Elsevier

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 97 MATHEMATICS AND COMPUTING; Interface reconstruction; Arbitrary 3D convex cells; Analytical formula; VOF method; Non-iterative technique

### Citation Formats

```
Diot, Steven, and François, Marianne M. An interface reconstruction method based on an analytical formula for 3D arbitrary convex cells. United States: N. p., 2015.
Web. doi:10.1016/j.jcp.2015.10.011.
```

```
Diot, Steven, & François, Marianne M. An interface reconstruction method based on an analytical formula for 3D arbitrary convex cells. United States. doi:10.1016/j.jcp.2015.10.011.
```

```
Diot, Steven, and François, Marianne M. Thu .
"An interface reconstruction method based on an analytical formula for 3D arbitrary convex cells". United States. doi:10.1016/j.jcp.2015.10.011. https://www.osti.gov/servlets/purl/1325632.
```

```
@article{osti_1325632,
```

title = {An interface reconstruction method based on an analytical formula for 3D arbitrary convex cells},

author = {Diot, Steven and François, Marianne M.},

abstractNote = {In this study, we are interested in an interface reconstruction method for 3D arbitrary convex cells that could be used in multi-material flow simulations for instance. We assume that the interface is represented by a plane whose normal vector is known and we focus on the volume-matching step that consists in finding the plane constant so that it splits the cell according to a given volume fraction. We follow the same approach as in the recent authors' publication for 2D arbitrary convex cells in planar and axisymmetrical geometries, namely we derive an analytical formula for the volume of the specific prismatoids obtained when decomposing the cell using the planes that are parallel to the interface and passing through all the cell nodes. This formula is used to bracket the interface plane constant such that the volume-matching problem is rewritten in a single prismatoid in which the same formula is used to find the final solution. Finally, the proposed method is tested against an important number of reproducible configurations and shown to be at least five times faster.},

doi = {10.1016/j.jcp.2015.10.011},

journal = {Journal of Computational Physics},

number = ,

volume = 305,

place = {United States},

year = {2015},

month = {10}

}

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