Abstract
The unsteady flow characteristics around two partially buried objects, a short cylinder and a truncated cone, were examined with a three-dimensional, non-hydrostatic hydrodynamic model under similar steady unidirectional currents with flow Reynolds numbers, Re, of 86,061 and 76,209, respectively. Model simulations were conducted with the two objects partially buried in a simulated rippled river bed. A Reynolds-averaged Navier-Stokes (RANS) equation model coupled with a?-? turbulence closure was used to validate the experimental velocity measurements. A large eddy simulation (LES) turbulence model was subsequently used to characterize the unsteady flow structure around the objects. The LES closure allowed for the characterization of highly unsteady coherent turbulent structures such as the horse-shoe vortex, the arch-shaped vortex, as well as vortex shedding in the wake of the object.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 31-46 |
| Number of pages | 16 |
| Journal | Journal of Hydroinformatics |
| Volume | 19 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 2017 |
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Keywords
- LES RANS numerical modeling
- Object burial
- Scour hole
- Sediment transport
- Turbulent flow
ASJC Scopus subject areas
- Civil and Structural Engineering
- Water Science and Technology
- Geotechnical Engineering and Engineering Geology
- Atmospheric Science
Cite this
Unstable flow structure around partially buried objects on a simulated river bed. / Cataño-Lopera, Yovanni A.; Landy, Blake J.; García, Marcelo H.
In: Journal of Hydroinformatics, Vol. 19, No. 1, 01.2017, p. 31-46.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Unstable flow structure around partially buried objects on a simulated river bed
AU - Cataño-Lopera, Yovanni A.
AU - Landy, Blake J.
AU - García, Marcelo H.
PY - 2017/1
Y1 - 2017/1
N2 - The unsteady flow characteristics around two partially buried objects, a short cylinder and a truncated cone, were examined with a three-dimensional, non-hydrostatic hydrodynamic model under similar steady unidirectional currents with flow Reynolds numbers, Re, of 86,061 and 76,209, respectively. Model simulations were conducted with the two objects partially buried in a simulated rippled river bed. A Reynolds-averaged Navier-Stokes (RANS) equation model coupled with a?-? turbulence closure was used to validate the experimental velocity measurements. A large eddy simulation (LES) turbulence model was subsequently used to characterize the unsteady flow structure around the objects. The LES closure allowed for the characterization of highly unsteady coherent turbulent structures such as the horse-shoe vortex, the arch-shaped vortex, as well as vortex shedding in the wake of the object.
AB - The unsteady flow characteristics around two partially buried objects, a short cylinder and a truncated cone, were examined with a three-dimensional, non-hydrostatic hydrodynamic model under similar steady unidirectional currents with flow Reynolds numbers, Re, of 86,061 and 76,209, respectively. Model simulations were conducted with the two objects partially buried in a simulated rippled river bed. A Reynolds-averaged Navier-Stokes (RANS) equation model coupled with a?-? turbulence closure was used to validate the experimental velocity measurements. A large eddy simulation (LES) turbulence model was subsequently used to characterize the unsteady flow structure around the objects. The LES closure allowed for the characterization of highly unsteady coherent turbulent structures such as the horse-shoe vortex, the arch-shaped vortex, as well as vortex shedding in the wake of the object.
KW - LES RANS numerical modeling
KW - Object burial
KW - Scour hole
KW - Sediment transport
KW - Turbulent flow
UR - http://www.scopus.com/inward/record.url?scp=85013029169&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85013029169&partnerID=8YFLogxK
U2 - 10.2166/hydro.2016.060
DO - 10.2166/hydro.2016.060
M3 - Article
AN - SCOPUS:85013029169
VL - 19
SP - 31
EP - 46
JO - Journal of Hydroinformatics
JF - Journal of Hydroinformatics
SN - 1464-7141
IS - 1
ER -