Guenther, Silke ; Oberlack, Martin (2005)
Modeling of the pressure-strain and diffusion-term in rotatiang flows.
ITi Conference on Turbulence. Bad Zwischenahn (21.09.2003-24.09.2003)
doi: 10.1007/3-540-27401-4_19
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (Abstract)
We reconsider the problem of shear free turbulent diffusion in a rotating frame, rotating about x1. Therefore turbulence is generated at a vibrating grid in the x2 − x3 plane and diffuses away from the grid in x1-direction. The flow geometry is given in figure 1. An important property of this flow is that there is no mean flow-velocity. With the help of Lie-group methods Reynoldsstress transport models can be analyzed for this kind of flow in a rotating frame. From the analysis it can be found that the turbulent diffusion only influences a finite domain. Insertion of this solution in the model equations shows that even fully nonlinear Reynolds-stress transport models (nonlinear in the Reynolds-stresses for the pressure-strain model) are insensitive to rotation for this type of flow. To improve this serious shortcoming of these models, a new model equation which is fully nonlinear in the mean-velocity gradient is needed. There appears to be one one-point model which may account for system rotation for this type of flow. It is the second-moment closure model by Sj¨ogren and Johansson [3] which is nonlinear in the mean-velocity gradient. Therefore new model equations for the pressure-strain-correlation and the diffusion term have been developed along the lines of this model.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2005 |
| Autor(en): | Guenther, Silke ; Oberlack, Martin |
| Art des Eintrags: | Bibliographie |
| Titel: | Modeling of the pressure-strain and diffusion-term in rotatiang flows |
| Sprache: | Englisch |
| Publikationsjahr: | 2005 |
| Ort: | Berlin |
| Verlag: | Springer |
| Buchtitel: | Progress in turbulence : with 10 tables |
| Reihe: | Springer proceedings in physics |
| Band einer Reihe: | 101 |
| Veranstaltungstitel: | ITi Conference on Turbulence |
| Veranstaltungsort: | Bad Zwischenahn |
| Veranstaltungsdatum: | 21.09.2003-24.09.2003 |
| DOI: | 10.1007/3-540-27401-4_19 |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | We reconsider the problem of shear free turbulent diffusion in a rotating frame, rotating about x1. Therefore turbulence is generated at a vibrating grid in the x2 − x3 plane and diffuses away from the grid in x1-direction. The flow geometry is given in figure 1. An important property of this flow is that there is no mean flow-velocity. With the help of Lie-group methods Reynoldsstress transport models can be analyzed for this kind of flow in a rotating frame. From the analysis it can be found that the turbulent diffusion only influences a finite domain. Insertion of this solution in the model equations shows that even fully nonlinear Reynolds-stress transport models (nonlinear in the Reynolds-stresses for the pressure-strain model) are insensitive to rotation for this type of flow. To improve this serious shortcoming of these models, a new model equation which is fully nonlinear in the mean-velocity gradient is needed. There appears to be one one-point model which may account for system rotation for this type of flow. It is the second-moment closure model by Sj¨ogren and Johansson [3] which is nonlinear in the mean-velocity gradient. Therefore new model equations for the pressure-strain-correlation and the diffusion term have been developed along the lines of this model. |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Fachgebiet für Strömungsdynamik (fdy) |
| Hinterlegungsdatum: | 20 Nov 2008 08:26 |
| Letzte Änderung: | 15 Nov 2024 08:07 |
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