Unsteady Simulation of Jets in a Cross Flow

✍ Scribed by Seonghyeon Hahn; Haecheon Choi

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 1014 KB
• Volume: 134
• Category: Article
• ISSN: 0021-9991
• DOI: 10.1006/jcph.1997.5712

✦ Synopsis

essential to gain knowledge of the interaction between the jet and cross flow and to develop a new film-cooling Effects of the computational time step and grid stretching on numerical solutions of a two-dimensional laminar boundary layer technology with a higher efficiency.

with a planar jet injected from a wall are investigated using a fully

The full-scale simulation of turbulent flows occurred in implicit time advancement scheme. A very large CFL number film cooling, including the statistics of flow variables, never-(CFL ϭ 64) is determined for a time accurate solution, which protheless, requires an enormous computational resource vides a factor of 50 savings in the required CPU time as compared mainly owing to the full three dimensionality and unsteadito a semi-implicit method. It is also noted that the grid stretching generates 2 Ϫ ⌬ waves in the flow investigated. A full three-dimen-ness of the flow. On the other hand, a close examination sional numerical simulation has been performed to qualitatively of the basic computational parameters such as the grid investigate the interaction of jets in a turbulent cross flow using the resolution and the size of the computational time step is direct numerical simulation technique. Turbulent vortex sheddings essential to achieve a successful result. Therefore, it is are observed behind jets and show a rapid diffusion in the downreasonable to explore the effect of these computational stream. It is also shown that a counter-rotating vortex pair existing parameters on the computed flow field by investigating a in the downstream of the jet contributes an important role in the dynamics of the jet in a cross flow. ᮊ 1997 Academic Press rather simple and less time-consuming situation. A twodimensional simulation of a planar jet in a laminar cross flow may be an appropriate candidate for this preliminary 342