# Unstructured adaptive grid flow simulations of inert and reactive gas mixtures

## Abstract

Unstructured adaptive grid flow simulation is applied to the calculation of high-speed compressible flows of inert and reactive gas mixtures. In the present case, the flowfield is simulated using the 2-D Euler equations, which are discretized in a cell-centered finite volume procedure on unstructured triangular meshes. Interface fluxes are calculated by a Liou flux vector splitting scheme which has been adapted to an unstructured grid context by the authors. Physicochemical properties are functions of the local mixture composition, temperature, and pressure, which are computed using the CHEMKIN-II subroutines. Computational results are presented for the case of premixed hydrogen-air supersonic flow over a 2-D wedge. In such a configuration, combustion may be triggered behind the oblique shock wave and transition to an oblique detonation wave is eventually obtained. It is shown that the solution adaptive procedure implemented is able to correctly define the important wave fronts. A parametric analysis of the influence of the adaptation parameters on the computed solution is performed.

- Authors:

- Publication Date:

- Research Org.:
- Centre National de la Recherche Scientifique, Chasseneuil (FR)

- OSTI Identifier:
- 20067697

- Resource Type:
- Journal Article

- Journal Name:
- Journal of Computational Physics

- Additional Journal Information:
- Journal Volume: 160; Journal Issue: 2; Other Information: PBD: 20 May 2000; Journal ID: ISSN 0021-9991

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 42 ENGINEERING; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; GAS FLOW; MIXTURES; MESH GENERATION; FINITE ELEMENT METHOD; COMPRESSIBLE FLOW; TWO-DIMENSIONAL CALCULATIONS; SUPERSONIC FLOW

### Citation Formats

```
Figueira da Silva, L.F., Azevedo, J.L.F., and Korzenowski, H.
```*Unstructured adaptive grid flow simulations of inert and reactive gas mixtures*. United States: N. p., 2000.
Web. doi:10.1006/jcph.2000.6470.

```
Figueira da Silva, L.F., Azevedo, J.L.F., & Korzenowski, H.
```*Unstructured adaptive grid flow simulations of inert and reactive gas mixtures*. United States. doi:10.1006/jcph.2000.6470.

```
Figueira da Silva, L.F., Azevedo, J.L.F., and Korzenowski, H. Sat .
"Unstructured adaptive grid flow simulations of inert and reactive gas mixtures". United States. doi:10.1006/jcph.2000.6470.
```

```
@article{osti_20067697,
```

title = {Unstructured adaptive grid flow simulations of inert and reactive gas mixtures},

author = {Figueira da Silva, L.F. and Azevedo, J.L.F. and Korzenowski, H.},

abstractNote = {Unstructured adaptive grid flow simulation is applied to the calculation of high-speed compressible flows of inert and reactive gas mixtures. In the present case, the flowfield is simulated using the 2-D Euler equations, which are discretized in a cell-centered finite volume procedure on unstructured triangular meshes. Interface fluxes are calculated by a Liou flux vector splitting scheme which has been adapted to an unstructured grid context by the authors. Physicochemical properties are functions of the local mixture composition, temperature, and pressure, which are computed using the CHEMKIN-II subroutines. Computational results are presented for the case of premixed hydrogen-air supersonic flow over a 2-D wedge. In such a configuration, combustion may be triggered behind the oblique shock wave and transition to an oblique detonation wave is eventually obtained. It is shown that the solution adaptive procedure implemented is able to correctly define the important wave fronts. A parametric analysis of the influence of the adaptation parameters on the computed solution is performed.},

doi = {10.1006/jcph.2000.6470},

journal = {Journal of Computational Physics},

issn = {0021-9991},

number = 2,

volume = 160,

place = {United States},

year = {2000},

month = {5}

}