Bitki Örtülü Kanalların Akım Özelliklerinin Hesaplamalı Akışkanlar Dinamiği ile Belirlenmesinde Yakın Duvar Davranışının Etkisi

Year 2023, , 109 - 123, 31.12.2023

Rahim Şibil

https://doi.org/10.53501/rteufemud.1323845

Abstract

Bu çalışmada bitki örtülü kanalların akım özelliklerinin sayısal olarak tahmin edilmesinde önemli parametrelerden biri olan yakın duvar davranışı yaklaşımlarının sonuçlara etkisi incelenmiştir. Bu amaçla sayısal çalışmalar, Hesaplamalı Akışkanlar Dinamiği (HAD) metodu ile analiz yapabilen Ansys Fluent yazılımı kullanılarak üç boyutlu, türbülanslı, sıkıştırılamayan ve kararlı akım koşullarında bitki örtülü dikdörtgen kesitli bir kanal için gerçekleştirilmiştir. Sayısal çalışmalarda yakın duvar davranışı için farklı yaklaşımlar kullanılarak kanaldaki hız dağılımları tahmin edilmeye çalışılmış ve sayısal çalışmalardan elde edilen sonuçlar literatürde yapılmış deneysel bir çalışmayla karşılaştırılarak en başarılı metot ortaya konulmuştur. Yapılan karşılaştırma sonucunda “geliştirilmiş duvar fonksiyonu” yaklaşımıyla kurulan sayısal çalışma en başarılı tahmin sonucu veren yaklaşım olmuştur. Ayrıca HAD analizi sonucunda elde edilen kanaldaki hız dağılımları verilerek, bitki örtülü açık kanal akımında hidrolik özellikler incelenmiştir.

Keywords

Açık-kanal akımı, Bitki örtülü kanal, Hesaplamalı Akışkanlar Dinamiği, Yakın Duvar Davranışı

The Effect of Near-Wall Treatment on The Determination of Flow Characteristics in Vegetated Channel Using Computational Fluid Dynamics

Abstract

In this study, the effect of different approaches to near-wall treatment, which is an important parameter in predicting the flow characteristics of vegetated-channels, was investigated. For this purpose, numerical simulations were conducted using the Ansys Fluent software, which could perform Computational Fluid Dynamics (CFD) analysis, for a three-dimensional, turbulent, incompressible, and steady flow condition in a rectangular channel vegetated-channel. In the numerical studies, different approaches for near-wall treatment were used to predict velocity distributions in the channel, and the results obtained from the numerical studies were compared with a previously conducted experimental study in the literature to determine the most successful method. The comparison revealed that the numerical study employing the "enhanced wall function" approach yielded the most accurate prediction results. Additionally, hydraulic characteristics in open-channel flow with vegetation were investigated by providing velocity distributions obtained from the CFD analysis.

Keywords

: Open-channel Flow, Vegetated-channel, Computational Fluid Dynamics, Near-Wall Treatment

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