TY - JOUR
T1 - Evaluation of turbulence models to predict airflow and ammonia concentrations in a scale model swine building enclosure
AU - Tong, Guohong
AU - Zhang, Guoqiang
AU - Christopher, David M.
AU - Bjerg, Bjarne Schmidt
AU - Ye, Zhangying
AU - Cheng, Jin
PY - 2013/1
Y1 - 2013/1
N2 - The performance of five widely used turbulence models, the standard k-ε model (SKE), the renormalization group k-ε model (RNG), the realizable k-ε model (RKE), the standard k-ω model (SKW) and the shear stress transport k-ω model (KWSST), were evaluated for simulations of airflow velocities and ammonia concentrations in a 1:12.5 scale model swine building without a floor (100% floor opening) and with a slatted floor with 16.7% floor opening area. The 100% floor opening case was used as a reference. The turbulence models were evaluated by comparing the numerical results with experimental data at representative points inside the scale model. The RKE and RNG models required less elements for grid-independent results with the predicted airflow patterns agreeing well with the smoke tests. The velocities and concentrations predicted by the RNG model were closer to the measured values with a maximum velocity difference of less than 0.03ms-1 (9.3%) and a maximum normalized concentration difference of less than 0.09 (12.3%) for the 100% floor opening. For the 16.7% floor opening, the maximum velocity difference in the main space was less than 0.02ms-1 (6.8%) and the maximum normalized concentration difference was less than 0.2 (25%). Thus, the RNG model most accurately predicts the airflow velocities and ammonia concentrations in the scale model swine building enclosure.
AB - The performance of five widely used turbulence models, the standard k-ε model (SKE), the renormalization group k-ε model (RNG), the realizable k-ε model (RKE), the standard k-ω model (SKW) and the shear stress transport k-ω model (KWSST), were evaluated for simulations of airflow velocities and ammonia concentrations in a 1:12.5 scale model swine building without a floor (100% floor opening) and with a slatted floor with 16.7% floor opening area. The 100% floor opening case was used as a reference. The turbulence models were evaluated by comparing the numerical results with experimental data at representative points inside the scale model. The RKE and RNG models required less elements for grid-independent results with the predicted airflow patterns agreeing well with the smoke tests. The velocities and concentrations predicted by the RNG model were closer to the measured values with a maximum velocity difference of less than 0.03ms-1 (9.3%) and a maximum normalized concentration difference of less than 0.09 (12.3%) for the 100% floor opening. For the 16.7% floor opening, the maximum velocity difference in the main space was less than 0.02ms-1 (6.8%) and the maximum normalized concentration difference was less than 0.2 (25%). Thus, the RNG model most accurately predicts the airflow velocities and ammonia concentrations in the scale model swine building enclosure.
U2 - 10.1016/j.compfluid.2012.10.020
DO - 10.1016/j.compfluid.2012.10.020
M3 - Journal article
SN - 0045-7930
VL - 71
SP - 240
EP - 249
JO - Computers and Fluids
JF - Computers and Fluids
ER -