TY - JOUR
ID -
TI - Low Reynolds number k-ε modeling by using the direct numerical simulation (DNS) data نموذج k-ε لأعداد رينولد منخفضة باستخدام بيانات المحاكاة المباشرة
AU - Ahmed Abdul-Hussein Ouda
PY - 2008
VL - 1
IS - 1
SP - 48
EP - 65
JO - JOURNAL OF THI-QAR SCIENCE مجلة علوم ذي قار
SN - 19918690
AB -
The constant Cµ and the near-wall damping function fµ in the eddy-viscosity relation of the k-ε model are evaluated from direct numerical simulation (DNS) data for developed channel and boundary-layer flow, each at two Reynolds numbers. Various existing fµ model functions are compared with the DNS data, and a new function is fitted to the high-Reynolds-number channel flow data. The ε-budget is computed for the fully developed channel flow. The relative magnitude of the terms in the ε-equation is analyzed with the aid of scaling arguments, and the parameter governing this magnitude is established. Models for the sum of all source and sink terms in the ε-¬ equation are tested against the DNS data, and an improved model is proposed.
ER -