Numerical Analysis Comparison of Egg Section Multiphase Wastewater Pipelines Under Flow Conditions

Esin Acar

Article Details

Numerical Analysis Comparison of Egg Section Multiphase Wastewater Pipelines Under Flow Conditions

Authors:

Esin Acar

Publisher:

Recep Tayyip Erdoğan University

Main Topics:

İnşaat Mühendisliğinde Sayısal Modelleme

Journal:

Recep Tayyip Erdoğan Üniversitesi Fen ve Mühendislik Bilimleri Dergisi Vol.6 Issue 1, pp.51-68

Document Type:

Article

Publication Date:

6/2025

Document Language:

Turkish

Document ID (Org No.):

2001351002

pISSN:

2687-2315

Keywords:

Abstract:

 Studies have been carried out under different flow conditions in the planning of wastewater pipe systems. In this context, computational fluid dynamics problems were created according to slope, flow velocity, cross-sectional properties, roughness, phase states and laminarturbulent flow characteristics. In the study, numerical analyses were performed with two different CFD programs and program outputs were compared. A 20 m long pipeline was used in the comparison and velocity values at 15.m and pipe flow cross sections were utilized. Thus, it was ensured that the outputs of Star CCM, which uses the finite volume method, and Ansys Fluent, which uses the finite element method, could be evaluated for the problem created under equal physical conditions. An egg section of 600mmx900mm was used for the pipeline and inlet velocities of V 0.0014 ms for laminar flow and V 0.70 ms and V 2.00 ms for turbulent flow. In the CFD program, volume of fluid, k-ε turbulence model for multiphase flow conditions were used to create appropriate models for the fluid. The compatibility of the results with each other, especially the flow velocity values give very similar results, which increases the reliability of the programs. The fact that the velocity values, velocity profiles and flow properties obtained according to the flow conditions in different phases are close to each other reveals the accuracy of the analysis values of CFD programs.

 Studies have been carried out under different flow conditions in the planning of wastewater pipe systems. In this context, computational fluid dynamics problems were created according to slope, flow velocity, cross-sectional properties, roughness, phase states and laminarturbulent flow characteristics. In the study, numerical analyses were performed with two different CFD programs and program outputs were compared. A 20 m long pipeline was used in the comparison and velocity values at 15.m and pipe flow cross sections were utilized. Thus, it was ensured that the outputs of Star CCM, which uses the finite volume method, and Ansys Fluent, which uses the finite element method, could be evaluated for the problem created under equal physical conditions. An egg section of 600mmx900mm was used for the pipeline and inlet velocities of V 0.0014 ms for laminar flow and V 0.70 ms and V 2.00 ms for turbulent flow. In the CFD program, volume of fluid, k-ε turbulence model for multiphase flow conditions were used to create appropriate models for the fluid. The compatibility of the results with each other, especially the flow velocity values give very similar results, which increases the reliability of the programs. The fact that the velocity values, velocity profiles and flow properties obtained according to the flow conditions in different phases are close to each other reveals the accuracy of the analysis values of CFD programs.

 Studies have been carried out under different flow conditions in the planning of wastewater pipe systems. In this context, computational fluid dynamics problems were created according to slope, flow velocity, cross-sectional properties, roughness, phase states and laminarturbulent flow characteristics. In the study, numerical analyses were performed with two different CFD programs and program outputs were compared. A 20 m long pipeline was used in the comparison and velocity values at 15.m and pipe flow cross sections were utilized. Thus, it was ensured that the outputs of Star CCM, which uses the finite volume method, and Ansys Fluent, which uses the finite element method, could be evaluated for the problem created under equal physical conditions. An egg section of 600mmx900mm was used for the pipeline and inlet velocities of V 0.0014 ms for laminar flow and V 0.70 ms and V 2.00 ms for turbulent flow. In the CFD program, volume of fluid, k-ε turbulence model for multiphase flow conditions were used to create appropriate models for the fluid. The compatibility of the results with each other, especially the flow velocity values give very similar results, which increases the reliability of the programs. The fact that the velocity values, velocity profiles and flow properties obtained according to the flow conditions in different phases are close to each other reveals the accuracy of the analysis values of CFD programs.

 Atıksu boru sistemleri planlamalarında farklı akış koşulları altında çalışmalar yapılmıştır. Bu kapsamda eğim, akış hızı, kesit özellikleri, pürüzlülük, faz durumları ve laminertürbülanslı akış özelliklerine göre hesaplamalı akışkanlar dinamiği problemi oluşturulmuştur. Çalışmada iki farklı CFD programı ile nümerik analizler ortaya konarak, program çıktıları karşılaştırılmıştır. Karşılaştırmada 20 m uzunluğunda bir boru hattı kullanılmış olup, 15.mdeki hız değerleri ile boru akış kesitlerinden yararlanılmıştır. Böylece eşit fiziki koşullarda oluşturulan problemin sonlu hacimler yöntemini kullanan Star CCM ile sonlu elemanlar yöntemi ile çalışan Ansys Fluent programları sonuçlarının çıktılarının değerlendirebilmesi sağlanmıştır. Boru hattı için 600mmx900mm boyutlarında yumurta kesit kullanılmış olup, laminer akış için V 0,0014 ms, türbülanslı akış için ise V 0,70 ms ve V 2,00 ms giriş hızları alınmıştır. CFD programında çok fazlı akış koşulları için volume of fluid, k-ε türbülans modeli kullanılarak, akışkan için uygun modellerin oluşturulması sağlanmıştır. Sonuçların birbiri ile uyumları, özellikle akış hız değerlerinin çok benzer sonuçlar vermesi programların güvenirliliklerini de arttırmaktadır. Farklı fazlardaki akış koşullarına göre de elde edilen hız değerleri, hız profilleri ve akış özelliklerinin birbirine yakın çıkması CFD programlarının analiz değerlerinin doğruluğunu ortaya koymaktadır.

Article Details

Numerical Analysis Comparison of Egg Section Multiphase Wastewater Pipelines Under Flow Conditions

Authors:

Esin Acar

Publisher:

Recep Tayyip Erdoğan University

Main Topics:

İnşaat Mühendisliğinde Sayısal Modelleme

Journal:

Recep Tayyip Erdoğan Üniversitesi Fen ve Mühendislik Bilimleri Dergisi Vol.6 Issue 1, pp.51-68

Document Type:

Article

Publication Date:

6/2025

Document Language:

Turkish

Document ID (Org No.):

2001351002

pISSN:

2687-2315

Egg shaped

Computational fluid dynamics (CFD)

Wastewater pipes

Multiphase flowYumurta kesit

Hesaplamalı akışkanlar dinamiği (CFD)

Atıksu boruları

Çok fazlı akış

Issues

Article Details

Authors: Esin Acar

Publisher: Recep Tayyip Erdoğan University

Main Topics: İnşaat Mühendisliğinde Sayısal Modelleme

Journal: Recep Tayyip Erdoğan Üniversitesi Fen ve Mühendislik Bilimleri Dergisi Vol.6 Issue 1, pp.51-68

Document Type: Article

Publication Date: 6/2025

Document Language: Turkish

Document ID (Org No.): 2001351002

pISSN: 2687-2315

Issues

Authors:

Esin Acar

Publisher:

Recep Tayyip Erdoğan University

Main Topics:

İnşaat Mühendisliğinde Sayısal Modelleme

Journal:

Recep Tayyip Erdoğan Üniversitesi Fen ve Mühendislik Bilimleri Dergisi Vol.6 Issue 1, pp.51-68

Document Type:

Article

Publication Date:

6/2025

Document Language:

Turkish

Document ID (Org No.):

2001351002

pISSN:

2687-2315