Dolusavak Akımının Farklı Türbülans Kapatma Modelleri ile Sayısal Hesabı

Laboratuvardaki bir dolusavak modelindeki akımda hızlar ve su yüzü profili ölçülmüştür. Deneyle aynı özelliklerdeki akımı idare eden temel denklemler Sonlu Hacimler yöntemi ile sayısal olarak çözülmüştür. Sayısal modellemede, Standard k-, Renormalization-group k- ve Realizable k-ε türbülans kapatma modelleri kullanılmıştır. Sayısal model bulgularının doğrulanmasına yönelik olarak deneysel bulgularla yapılan karşılaştırmalar, Renormalization-group k-ε ve Realizable k-ε türbülans modellerinden elde edilen sayısal bulguların birbirlerine çok yakın, ve her iki modelin de hız alanı ve su yüzü profilinin hesaplanmasında Standard k- modeline göre daha başarılı olduğunu göstermiştir

Anahtar Kelimeler:

Dolusavak, hız profili, VOF, Türbülans kapatma modelleri, Sayısal hesaplama

Numerical Analysis of Spillway Flow Using Different Turbulence Closure Models

Velocity field and free surface profile of flow over a spillway is measured in a laboratory channel. The governing equations are numerically solved using Finite Volume method for the flow having the same conditions with experiment. In the numerical simulation of the flow, Standard k-, Renormalization-group k-ε and Realizable k-ε turbulence closure models are employed. Experimental validations of the computations show that the numerical results from the Renormalization-group k-ε and Realizable k-ε turbulence model are very close to each other, and they are both more successful compared to the Standard k- turbulence model, in predicting the velocity field and free surface of the flow

Keywords:

Spillway, Velocity field, VOF, Turbulence closure models, Numerical analysis,

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