TY - JOUR
T1 - A Modification of the K-ε Turbulence Model for In-Cylinder Gas Flow
AU - Kido, Hiroyuki
AU - Nakashima, Kenshiro
AU - Tajima, Hiroshi
AU - Kitagawa, Toshiaki
PY - 1989/2/15
Y1 - 1989/2/15
N2 - A modification of the values of three constants C_1, C_2 and C_3 in the standard K-ε turbulence model is proposed, based on the empirical law of decay obtained for nearly homogeneous in-cylinder turbulence. Since the decay exponent of Reynolds numbers for in-cylinder turbulence is found to be different from that for steady ducted flow just behind a turbulence-generating grid, the C_2 value is modified first, followed by the C_1 and C_3 values, which depend on the C_2 value. The derived C_2 value of 1.40 is smaller than that in the standard K-ε turbulence model, but the C_1 value, 1.40, is close to that of the standard one. The C_3 value, -1.05, is very close to the recommended value by Morel et al. for the case of a unidirectional axial compression.
AB - A modification of the values of three constants C_1, C_2 and C_3 in the standard K-ε turbulence model is proposed, based on the empirical law of decay obtained for nearly homogeneous in-cylinder turbulence. Since the decay exponent of Reynolds numbers for in-cylinder turbulence is found to be different from that for steady ducted flow just behind a turbulence-generating grid, the C_2 value is modified first, followed by the C_1 and C_3 values, which depend on the C_2 value. The derived C_2 value of 1.40 is smaller than that in the standard K-ε turbulence model, but the C_1 value, 1.40, is close to that of the standard one. The C_3 value, -1.05, is very close to the recommended value by Morel et al. for the case of a unidirectional axial compression.
UR - https://ci.nii.ac.jp/naid/110002494239
M3 - Article
SN - 0914-8817
VL - 32
SP - 85
EP - 90
JO - JSME International Journal, Series B: Fluids and Thermal Engineering
JF - JSME International Journal, Series B: Fluids and Thermal Engineering
IS - 1
ER -