Research output: Contribution to Journal/Magazine › Journal article › peer-review
A comparative RANS/LES study of transient gas jets and sprays under diesel conditions. / Valentino, Mariafrancesca; Jiang, Xi; Zhao, Hua.
In: Atomization and Sprays, Vol. 17, No. 5, 2007, p. 451-472.Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - A comparative RANS/LES study of transient gas jets and sprays under diesel conditions
AU - Valentino, Mariafrancesca
AU - Jiang, Xi
AU - Zhao, Hua
PY - 2007
Y1 - 2007
N2 - This study aimed at a better understanding of the transient nature of axisymmetric gas jets and sprays under diesel conditions. To evaluate the performances of the Reynolds-averaged Navier-Stokes (RANS) and the large eddy simulation (LES) modeling approaches, a comparative computational study using both methodologies has been performed for the same computational cases with the same numerical algorithm and spatial resolution. The results show that LES is capable of capturing the unsteady features of transient gas jets and sprays such as flow vortical structures, whereas RANS is incapable of resolving these features. Furthermore, the excessive dissipation in the RANS simulation can lead to underprediction of the jet penetration, while LES can better represent the jet mixing and entrainment, which offers a promising tool for numerical prediction of transient jets and sprays.
AB - This study aimed at a better understanding of the transient nature of axisymmetric gas jets and sprays under diesel conditions. To evaluate the performances of the Reynolds-averaged Navier-Stokes (RANS) and the large eddy simulation (LES) modeling approaches, a comparative computational study using both methodologies has been performed for the same computational cases with the same numerical algorithm and spatial resolution. The results show that LES is capable of capturing the unsteady features of transient gas jets and sprays such as flow vortical structures, whereas RANS is incapable of resolving these features. Furthermore, the excessive dissipation in the RANS simulation can lead to underprediction of the jet penetration, while LES can better represent the jet mixing and entrainment, which offers a promising tool for numerical prediction of transient jets and sprays.
KW - LIQUID PENETRATION
KW - ENGINE
KW - MODELS
U2 - 10.1615/AtomizSpr.v17.i5
DO - 10.1615/AtomizSpr.v17.i5
M3 - Journal article
VL - 17
SP - 451
EP - 472
JO - Atomization and Sprays
JF - Atomization and Sprays
SN - 1044-5110
IS - 5
ER -