Abstract
The effects of buoyancy on the wake behind a two-dimensional (2-D) heated obstacle immersed in a turbulent boundary layer have been examined both experimentally and numerically in an effort to understand the thermal release over complex terrain in an idealized environmental flow. Emphasis was placed on clarifying the modification of the production agencies of the turbulence kinetic energy, resulting both from the direct and indirect buoyant contributions. Buoyancy altered the mean velocity field along the extent of the recirculating region and resulted in a reduction of the turbulent kinetic energy in the vicinity of the obstacle and, through an enhanced shear production, a growth downstream. Buoyant production of turbulent kinetic energy dominated the shear production outside the recirculating region, where the temperature variance was significant. Numerical predictions obtained by a recent buoyancy-extended κ-ε model were found to give the analogous properties of buoyant motion appearing in the experimental results.
| Original language | English |
|---|---|
| Pages (from-to) | 405-416 |
| Number of pages | 12 |
| Journal | International Journal of Heat and Fluid Flow |
| Volume | 16 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 1995 |
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Keywords
- buoyancy effects
- forced convection
- laser Doppler anemometer measurement
- recirculating flow
- two-equation model
ASJC Scopus subject areas
- Fluid Flow and Transfer Processes
- Mechanical Engineering
- Condensed Matter Physics
Cite this
Buoyancy effects on the wake behind a heated obstacle immersed in a turbulent boundary layer. / Mori, Y. S.; Hishida, Koichi; Maeda, M.
In: International Journal of Heat and Fluid Flow, Vol. 16, No. 5, 1995, p. 405-416.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Buoyancy effects on the wake behind a heated obstacle immersed in a turbulent boundary layer
AU - Mori, Y. S.
AU - Hishida, Koichi
AU - Maeda, M.
PY - 1995
Y1 - 1995
N2 - The effects of buoyancy on the wake behind a two-dimensional (2-D) heated obstacle immersed in a turbulent boundary layer have been examined both experimentally and numerically in an effort to understand the thermal release over complex terrain in an idealized environmental flow. Emphasis was placed on clarifying the modification of the production agencies of the turbulence kinetic energy, resulting both from the direct and indirect buoyant contributions. Buoyancy altered the mean velocity field along the extent of the recirculating region and resulted in a reduction of the turbulent kinetic energy in the vicinity of the obstacle and, through an enhanced shear production, a growth downstream. Buoyant production of turbulent kinetic energy dominated the shear production outside the recirculating region, where the temperature variance was significant. Numerical predictions obtained by a recent buoyancy-extended κ-ε model were found to give the analogous properties of buoyant motion appearing in the experimental results.
AB - The effects of buoyancy on the wake behind a two-dimensional (2-D) heated obstacle immersed in a turbulent boundary layer have been examined both experimentally and numerically in an effort to understand the thermal release over complex terrain in an idealized environmental flow. Emphasis was placed on clarifying the modification of the production agencies of the turbulence kinetic energy, resulting both from the direct and indirect buoyant contributions. Buoyancy altered the mean velocity field along the extent of the recirculating region and resulted in a reduction of the turbulent kinetic energy in the vicinity of the obstacle and, through an enhanced shear production, a growth downstream. Buoyant production of turbulent kinetic energy dominated the shear production outside the recirculating region, where the temperature variance was significant. Numerical predictions obtained by a recent buoyancy-extended κ-ε model were found to give the analogous properties of buoyant motion appearing in the experimental results.
KW - buoyancy effects
KW - forced convection
KW - laser Doppler anemometer measurement
KW - recirculating flow
KW - two-equation model
UR - http://www.scopus.com/inward/record.url?scp=58149326596&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=58149326596&partnerID=8YFLogxK
U2 - 10.1016/0142-727X(95)00055-U
DO - 10.1016/0142-727X(95)00055-U
M3 - Article
AN - SCOPUS:58149326596
VL - 16
SP - 405
EP - 416
JO - International Journal of Heat and Fluid Flow
JF - International Journal of Heat and Fluid Flow
SN - 0142-727X
IS - 5
ER -