An Approach for Solver Sensitivity Analysis Cfd Simulations for Natural Ventilating in a Middle-Scale Mosque

Ayse Seyma Arslantas; İdil Ayçam

Makale detayları

An Approach for Solver Sensitivity Analysis Cfd Simulations for Natural Ventilating in a Middle-Scale Mosque

Yazarlar:

Ayse Seyma Arslantas | İdil Ayçam

Yayıncı:

Gazi University

Ana Başlıklar:

Sürdürülebilir Mimari

Dergi:

Gazi University Journal of Science Part B: Art Humanities Design and Planning Vol.13 Issue 1, pp.51-64

Belge Tipi:

Makale

Yayın Tarihi:

3/2025

Belge Dili:

İngilizce

Document ID (Org No.):

2001344554

pISSN:

2147-9534

Anahtar kelimeler:

Özet:

 Building simulations are used at every stage of implementing energy-efficient building design. During the design phase, measures to reduce the buildings energy consumption can be taken, and in existing structures, the potential for natural ventilation can be utilized through passive design principles without compromising comfort conditions. In addition, predicting the effectiveness of natural ventilation often leads to highly uncertain results compared to mechanical systems. Unlike the extensive mechanical system analyses found in the literature, there is uncertainty in the accuracy of appropriate CFD solution steps in natural ventilation studies. Different approaches are being tested in CFD solutions to increase the accuracy of simulation-based predictions. Among the approaches to predicting ventilation effectiveness in buildings, computational fluid dynamics CFD calculations are common. CFD analyses show varying results depending on solver settings, discretization schemes, turbulence models, mesh sensitivity, and time methods. In this study, different analytical approaches are tested for certain opening configurations to analyze the effect of numerous uncertain variables on comfort parameters. The extent to which the results of the Coupled and SIMPLE solvers affect cross-ventilation and perpendicular ventilation cases is questioned. Differences between parameters such as CO2 concentration as a pollutant gas value, air velocity, and temperature have been taken into account. While the air velocity parameter shows quite similar results for both solvers, the results for CO2 concentration and temperature parameters differ significantly. Whether the flow is in two-dimensional or 3D flow volume affects the solver settings. Since CO2 concentrations depend on the mass increase, they were found to be slightly affected by the solvent difference. Air velocity was found to be the most important factor affecting the flow pattern and the distribution of concentrations and temperature.

 Building simulations are used at every stage of implementing energy-efficient building design. During the design phase, measures to reduce the buildings energy consumption can be taken, and in existing structures, the potential for natural ventilation can be utilized through passive design principles without compromising comfort conditions. In addition, predicting the effectiveness of natural ventilation often leads to highly uncertain results compared to mechanical systems. Unlike the extensive mechanical system analyses found in the literature, there is uncertainty in the accuracy of appropriate CFD solution steps in natural ventilation studies. Different approaches are being tested in CFD solutions to increase the accuracy of simulation-based predictions. Among the approaches to predicting ventilation effectiveness in buildings, computational fluid dynamics CFD calculations are common. CFD analyses show varying results depending on solver settings, discretization schemes, turbulence models, mesh sensitivity, and time methods. In this study, different analytical approaches are tested for certain opening configurations to analyze the effect of numerous uncertain variables on comfort parameters. The extent to which the results of the Coupled and SIMPLE solvers affect cross-ventilation and perpendicular ventilation cases is questioned. Differences between parameters such as CO2 concentration as a pollutant gas value, air velocity, and temperature have been taken into account. While the air velocity parameter shows quite similar results for both solvers, the results for CO2 concentration and temperature parameters differ significantly. Whether the flow is in two-dimensional or 3D flow volume affects the solver settings. Since CO2 concentrations depend on the mass increase, they were found to be slightly affected by the solvent difference. Air velocity was found to be the most important factor affecting the flow pattern and the distribution of concentrations and temperature.

 Building simulations are used at every stage of implementing energy-efficient building design. During the design phase, measures to reduce the buildings energy consumption can be taken, and in existing structures, the potential for natural ventilation can be utilized through passive design principles without compromising comfort conditions. In addition, predicting the effectiveness of natural ventilation often leads to highly uncertain results compared to mechanical systems. Unlike the extensive mechanical system analyses found in the literature, there is uncertainty in the accuracy of appropriate CFD solution steps in natural ventilation studies. Different approaches are being tested in CFD solutions to increase the accuracy of simulation-based predictions. Among the approaches to predicting ventilation effectiveness in buildings, computational fluid dynamics CFD calculations are common. CFD analyses show varying results depending on solver settings, discretization schemes, turbulence models, mesh sensitivity, and time methods. In this study, different analytical approaches are tested for certain opening configurations to analyze the effect of numerous uncertain variables on comfort parameters. The extent to which the results of the Coupled and SIMPLE solvers affect cross-ventilation and perpendicular ventilation cases is questioned. Differences between parameters such as CO2 concentration as a pollutant gas value, air velocity, and temperature have been taken into account. While the air velocity parameter shows quite similar results for both solvers, the results for CO2 concentration and temperature parameters differ significantly. Whether the flow is in two-dimensional or 3D flow volume affects the solver settings. Since CO2 concentrations depend on the mass increase, they were found to be slightly affected by the solvent difference. Air velocity was found to be the most important factor affecting the flow pattern and the distribution of concentrations and temperature.

 Enerji etkin yapı tasarımının gerçekleştirilebilmesinin her aşamasında yapı simülasyonları kullanılmaktadır. Hem tasarım aşamasında yapının enerji kullanımlarının azaltılması önlemlerinde, hem de mevcut yapıların havalandırma enerji tüketimlerinin azaltılmasında, konfor koşullarından ödün verilmeden yapılacak pasif tasarım prensipleri ile binalarda doğal havalandırma potansiyelinden yararlanılabilecektir. Bunların yanı sıra doğal havalandırmanın etkinliğinin tahmini, mekanik sistemlere göre belirsizliği yüksek sonuçlara sebep olmaktadır. Literatürde geniş yer tutan mekanik system analizlerinden farklı olarak, doğal havalandırma çalışmalarında, uygun CFD bilgisayarlı akışkanlar dinamiği çözüm adımlarının doğruluğunda belirsizlik bulunmaktadır. Simülasyona bağlı tahminlerin doğruluğunu arttırmak amacıyla CFD çözümlerinde farklı yaklaşımlar denenmektedir. Yapılarda havalandırma etkinliğini tahmin yaklaşımları arasında CFD hesaplamaları yaygındır. CFD analizleri çözücü ayarları, ayrıştırma şemaları, türbülans modelleri, mesh hassasiyeti ve time methodlarına bağlı olarak farklı sonuçlar göstermektedir.Bu çalışmada, çok sayıdaki belirsiz değişkenle yapılacak analizlerin konfor parametrelerine etkisini analiz etmek amacıyla belli açıklık düzenleri için farklı çözümleme yaklaşımları denenmektedir. Çapraz havalandırma ve birbirine dik açıklıklardan havalandırma perpendicular durumları için Coupled ve SIMPLE çözücülerin sonuçları hangi oranda etkilediği sorgulanmaktadır. Kirletici gaz değeri olarak CO2 konsantrasyonu, hava hızı ve sıcaklık parametreleri arasındaki farklılıklar dikkate alınmıştır. CO2 concentration ve sıcaklık parametresinde iki çözücü için oldukça yakın sonuçlar göstermekte iken hava hızı parametresi sonuçlar birbirinden farklılık göstermektedir. Akışın iki boyutlu ve 3 boyutlu akış hacminde olup olmadığı, çözücü ayarlarını etkilemektedir. CO2 konsantrasyonları kütlesel artışa bağlı olduğundan, çözücü farklılığından düşük oranda etkilendiği görülmüştür. Akış desenini etkileyen, konsantrasyonların ve sıcaklığın dağılımını etkileyen en önemli faktörün hava hızı olduğu görülmüştür.

Makale detayları

An Approach for Solver Sensitivity Analysis Cfd Simulations for Natural Ventilating in a Middle-Scale Mosque

Yazarlar:

Ayse Seyma Arslantas | İdil Ayçam

Yayıncı:

Gazi University

Ana Başlıklar:

Sürdürülebilir Mimari

Dergi:

Gazi University Journal of Science Part B: Art Humanities Design and Planning Vol.13 Issue 1, pp.51-64

Belge Tipi:

Makale

Yayın Tarihi:

3/2025

Belge Dili:

İngilizce

Document ID (Org No.):

2001344554

pISSN:

2147-9534

Building Physics

Computational Methods in Fluid Flow

Models and Simulations of DesignYapı Fiziği

Akışkan Akışı

Tasarım Modelleri ve Simülasyonları.

Sayı

Makale detayları

An Approach for Solver Sensitivity Analysis Cfd Simulations for Natural Ventilating in a Middle-Scale Mosque

Yazarlar: Ayse Seyma Arslantas | İdil Ayçam

Yayıncı: Gazi University

Ana Başlıklar: Sürdürülebilir Mimari

Dergi: Gazi University Journal of Science Part B: Art Humanities Design and Planning Vol.13 Issue 1, pp.51-64

Belge Tipi: Makale

Yayın Tarihi: 3/2025

Belge Dili: İngilizce

Document ID (Org No.): 2001344554

pISSN: 2147-9534

Building Physics

Computational Methods in Fluid Flow

Models and Simulations of DesignYapı Fiziği

Akışkan Akışı

Tasarım Modelleri ve Simülasyonları.

Sayı

Yazarlar:

Ayse Seyma Arslantas | İdil Ayçam

Yayıncı:

Gazi University

Ana Başlıklar:

Sürdürülebilir Mimari

Dergi:

Gazi University Journal of Science Part B: Art Humanities Design and Planning Vol.13 Issue 1, pp.51-64

Belge Tipi:

Makale

Yayın Tarihi:

3/2025

Belge Dili:

İngilizce

Document ID (Org No.):

2001344554

pISSN:

2147-9534