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ÜSTTEN AKIŞLI KAPAK AKIMININ SAYISAL MODELLEMESİ
2020
Journal:  
Mühendislik Bilimleri ve Tasarım Dergisi
Author:  
Abstract:

Pivot savak olarak adlandırılan üstten akışlı kapaklar, açık kanal akımlarında akımı kontrol etmek ve düzenlemek için oldukça sık kullanılmaktadır. Pivot savaklar, istenilen seviyede su alma imkânı ve seviye kontrolü sağlamasından dolayı diğer savak türlerine göre daha avantajlıdır. Bu çalışmada, kanal tabanına farklı açılarda yerleştirilmiş üstten akışlı kapak üzerinden geçen akım sayısal olarak modellenmiştir. Sayısal modellemede akımı idare eden temel denklemler, sonlu hacimler yöntemine dayalı çözüm yapan ANSYS- Fluent paket programı yardımıyla, Reynolds Gerilme Modeli (Reynolds Stress Model-RSM) kullanılarak çözülmüştür. Su-hava arakesitinin belirlenmesinde ise akışkan hacimleri yöntemi kullanılmıştır. 6 farklı kapak açısında, RSM türbülans modeli kullanılarak elde edilen sayısal su yüzü profilleri, vena kontratta noktasının özellikleri ve daralma katsayıları, deneysel sonuçlarla karşılaştırılmıştır. Karşılaştırma sonucunda, akım çizgilerinde eğriselliğin bulunduğu akımlarda başarılı sonuçlar veren RSM modelinin, farklı açılara sahip üstten akışlı kapak üzerinden geçen akımın sayısal modellemesinde başarılı olduğu belirlenmiştir. Ayrıca, sayısal olarak elde edilen hız, dinamik basınç ve akım çizgilerinin dağılımları değerlendirilmiştir.

Keywords:

The top model of the top model
2020
Author:  
Abstract:

Upper-flowed coatings, called pivot coatings, are quite frequently used to control and regulate flow in open-channel streams. Pivot rabbits are more advantageous than other rabbits because they provide water absorption and level control at the desired level. In this study, the current passing through the upper-flowed cover placed in different angles to the base of the channel has been numerically modeled. The basic equations managing flow in numerical modeling have been solved with the help of the ANSYS-Fluent package program, which is a solution based on the end-volume method, using the Reynolds Stress Model-RSM. In order to determine the air-air arakesite, the fluid volume method was used. In 6 different cover angles, the number of water face profiles obtained using the RSM turbulence model, the characteristics of the vein contract point and the compression ratio are compared with the experimental results. As a result of the comparison, the RSM model, which has achieved successful results in the currents in which currents are curved, has been established to be successful in the numerical modeling of the currents passing through the upper-flowed cover with different angles. In addition, the numerically achieved speed, dynamic pressure and distribution of the current lines have been assessed.

Keywords:

Numerical Modeling Of Overshot Gate Flow
2020
Author:  
Abstract:

Overshot gates, called pivot weir, are often used to control the flow, and regulate flow depth in open channel flows. Pivot weirs are advantageous compared to other weir types because they provide the desired level of water intake and level control. In this study, the flow passing overshot gate placed at different angles to the channel bottom is numerically modeled. In numerical modeling, the basic equations that govern of the flow are solved using the Reynolds Stress Model (RSM) with the help of ANSYS-Fluent package program, which makes a solution based on finite volumes method. Volume of Fluid Method (VOF) was used to determine the water-air intersection. Numerical water surface profiles, the properties of the vena contract and contraction coefficients obtained using the RSM turbulence model at 6 different gate angles, were compared with experimental surface profiles and values. As a result of the comparison, it was determined that the RSM model, gives successful results in flows with curvature in the streamlines, is successful in numerical modeling of the overshot gate flow with different angles. In addition, velocity, dynamic pressure and streamlines distributions obtained numerically were evaluated.

Keywords:

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Mühendislik Bilimleri ve Tasarım Dergisi

Field :   Mimarlık, Planlama ve Tasarım; Mühendislik

Journal Type :   Uluslararası

Metrics
Article : 986
Cite : 2.256
Mühendislik Bilimleri ve Tasarım Dergisi