Abstract
| Original language | English |
|---|---|
| Pages (from-to) | W12417-1-W12417-10 |
| Journal | Water resources research |
| Volume | 43 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2007 |
Fingerprint
Keywords
- IR-60020
- METIS-232135
Cite this
}
A parameterization of flow separation over sub-aqueous dunes. / Paarlberg, Andries; Dohmen-Janssen, Catarine M.; Hulscher, Suzanne J.M.H.; Termes, Paul.
In: Water resources research, Vol. 43, No. 12, 2007, p. W12417-1-W12417-10.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - A parameterization of flow separation over sub-aqueous dunes
AU - Paarlberg, Andries
AU - Dohmen-Janssen, Catarine M.
AU - Hulscher, Suzanne J.M.H.
AU - Termes, Paul
PY - 2007
Y1 - 2007
N2 - Flow separation plays a key role in the development of dunes, and modeling the complicated flow behavior inside the flow separation zone requires much computational effort. To make a first step toward modeling dune development at reasonable temporal and spatial scales, a parameterization of the shape of the flow separation zone over two-dimensional dunes is proposed herein, in order to avoid modeling the complex flow inside the flow separation zone. Flow separation behind dunes, with an angle-of-repose slip face, is characterized by a large circulating leeside eddy, where a separation streamline forms the upper boundary of the recirculating eddy. Experimental data of turbulent flow over two-dimensional subaqueous bed forms are used to parameterize this separation streamline. The bed forms have various heights and height to length ratios, and a wide range of flow conditions is analyzed. This paper shows that the shape of the flow separation zone can be approximated by a third-order polynomial as a function of the distance away from the flow separation point. The coefficients of the polynomial can be estimated, independent of flow conditions, on the basis of bed form shape at the flow separation point and a constant angle of the separation streamline at the flow reattachment point.
AB - Flow separation plays a key role in the development of dunes, and modeling the complicated flow behavior inside the flow separation zone requires much computational effort. To make a first step toward modeling dune development at reasonable temporal and spatial scales, a parameterization of the shape of the flow separation zone over two-dimensional dunes is proposed herein, in order to avoid modeling the complex flow inside the flow separation zone. Flow separation behind dunes, with an angle-of-repose slip face, is characterized by a large circulating leeside eddy, where a separation streamline forms the upper boundary of the recirculating eddy. Experimental data of turbulent flow over two-dimensional subaqueous bed forms are used to parameterize this separation streamline. The bed forms have various heights and height to length ratios, and a wide range of flow conditions is analyzed. This paper shows that the shape of the flow separation zone can be approximated by a third-order polynomial as a function of the distance away from the flow separation point. The coefficients of the polynomial can be estimated, independent of flow conditions, on the basis of bed form shape at the flow separation point and a constant angle of the separation streamline at the flow reattachment point.
KW - IR-60020
KW - METIS-232135
U2 - 10.1029/2006WR005425
DO - 10.1029/2006WR005425
M3 - Article
VL - 43
SP - W12417-1-W12417-10
JO - Water resources research
JF - Water resources research
SN - 0043-1397
IS - 12
ER -