Abstract
Dense underflows developing two dimensionally on a slope are simulated numerically. The k-ε model is used for the turbulence closure. The boundary-layer approximately renders the governing equations in the form of parabolic partial differential equations, which are easier to solve numerically than elliptic equations. Evolution of vertical structures of dense underflows is computed along the streamwise direction. Excellent similarity collapses of the computed vertical structures are obtained. The computed profiles of velocity and concentration are compared with measured data, resulting in good agreement. The impact of a parameter representing the stratification level in the k-ε model is investigated. Appropriate values of this parameter, yielding results that are nearly identical to the integral model, are proposed. Water entrainment coefficient are estimated from computed solutions, and are observed to fall within the range of previous measurements. Finally, by using the collapsed vertical structures, profile constants defined in the integral model are calculated, which assures that the top-hat assumption necessary for deriving the integral model is valid.
| Original language | English |
|---|---|
| Pages (from-to) | 55-63 |
| Number of pages | 9 |
| Journal | Journal of Hydraulic Engineering |
| Volume | 128 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2002 Jan 1 |
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All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering
- Water Science and Technology
- Mechanical Engineering
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k-ε turbulence modeling of density currents developing two dimensionally on a slope. / Choi, Sung Uk; Garcia, Marcelo H.
In: Journal of Hydraulic Engineering, Vol. 128, No. 1, 01.01.2002, p. 55-63.Research output: Contribution to journal › Article
TY - JOUR
T1 - k-ε turbulence modeling of density currents developing two dimensionally on a slope
AU - Choi, Sung Uk
AU - Garcia, Marcelo H.
PY - 2002/1/1
Y1 - 2002/1/1
N2 - Dense underflows developing two dimensionally on a slope are simulated numerically. The k-ε model is used for the turbulence closure. The boundary-layer approximately renders the governing equations in the form of parabolic partial differential equations, which are easier to solve numerically than elliptic equations. Evolution of vertical structures of dense underflows is computed along the streamwise direction. Excellent similarity collapses of the computed vertical structures are obtained. The computed profiles of velocity and concentration are compared with measured data, resulting in good agreement. The impact of a parameter representing the stratification level in the k-ε model is investigated. Appropriate values of this parameter, yielding results that are nearly identical to the integral model, are proposed. Water entrainment coefficient are estimated from computed solutions, and are observed to fall within the range of previous measurements. Finally, by using the collapsed vertical structures, profile constants defined in the integral model are calculated, which assures that the top-hat assumption necessary for deriving the integral model is valid.
AB - Dense underflows developing two dimensionally on a slope are simulated numerically. The k-ε model is used for the turbulence closure. The boundary-layer approximately renders the governing equations in the form of parabolic partial differential equations, which are easier to solve numerically than elliptic equations. Evolution of vertical structures of dense underflows is computed along the streamwise direction. Excellent similarity collapses of the computed vertical structures are obtained. The computed profiles of velocity and concentration are compared with measured data, resulting in good agreement. The impact of a parameter representing the stratification level in the k-ε model is investigated. Appropriate values of this parameter, yielding results that are nearly identical to the integral model, are proposed. Water entrainment coefficient are estimated from computed solutions, and are observed to fall within the range of previous measurements. Finally, by using the collapsed vertical structures, profile constants defined in the integral model are calculated, which assures that the top-hat assumption necessary for deriving the integral model is valid.
UR - http://www.scopus.com/inward/record.url?scp=0036173075&partnerID=8YFLogxK
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U2 - 10.1061/(ASCE)0733-9429(2002)128:1(55)
DO - 10.1061/(ASCE)0733-9429(2002)128:1(55)
M3 - Article
AN - SCOPUS:0036173075
VL - 128
SP - 55
EP - 63
JO - Journal of Hydraulic Engineering
JF - Journal of Hydraulic Engineering
SN - 0733-9429
IS - 1
ER -