| タイトル | A rapid-distortion-theory turbulence model for developed unsteady wall-bounded flow |
| 本文（外部サイト） | http://hdl.handle.net/2060/19930023010 |
| 著者（英） | Brereton, G. J.; Mankbadi, R. R. |
| 著者所属（英） | NASA Lewis Research Center |
| 発行日 | 1993-07-01 |
| 言語 | eng |
| 内容記述 | A new approach to turbulence modeling in unsteady developed flows has recently been introduced, based on results of rapid distortion theory. The approach involves closing the k-epsilon equations for the organized unsteady component of the flow by modeling local unsteadiness as a rapid distortion of the local structure of the parent turbulent flow, in terms of an effective strain parameter alpha(sub eff). In this paper, the phase-conditioned equations of motion are developed to accommodate a new unsteady dissipation model and local effects of the slow-relaxation time scale of the parent flow. The model equations are tested against measurements of the response of a fully-developed turbulent pipe flow to the superposition of sinusoidal streamwise oscillation. Good agreement is found between measurements and predictions over a wide range of frequencies of unsteadiness, indicating that this approach may be particularly well suited to modeling of unsteady turbulent flows which are perturbations about a well characterized mean. |
| NASA分類 | FLUID MECHANICS AND HEAT TRANSFER |
| レポートNO | 93N32199
NASA-TM-106249
ICOMP-93-22
E-7971
NAS 1.15:106249 |
| 権利 | No Copyright |
