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GİRDAPLI AKIŞLARDA TÜRBÜLANS MODELLERİNİN UYGUNLUĞUNUN İNCELENMESİ

Investigation into the Suitability of Turbulence Models in Swirling Flows

Journal Name:

  • Uludağ Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

Publication Year:

  • 2007

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
The aim of this work is to investigate the suitability of various turbulence models in highly complex swirling flows which occur in tangential inlet cyclones. Three dimensional steady governing equations for the incompressible, turbulent flow inside the cyclone are solved numerically by using Fluent CFD code, under certain boundary conditions. Different turbulence models and wall functions are tested to get axial and tangential velocity profiles, pressure drop and turbulent quantities. Predicted results are compared with the experimental and numerical values given in the literature. Results obtained from the numerical tests have demonstrated that the key to the success of CFD lies with the accurate description of the turbulent behavior of the flow and the RSM turbulence model performs much better than the other models employed.
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Abstract (Original Language): 
Bu çalışmada, oldukça karmaşık ve girdaplı akışlarda türbülans modellerinin uygunluğunun incelenmesi konusu ele alınmıştır. Bu tür bir akışın görüldüğü uygulama örneği olarak teğetsel girişli bir siklon kullanılmıştır. Sabit boyut oranlarında, belli sınır şartları altında siklondaki hava hareketi için 3 boyutlu sabit özellikli ve sürekli rejim halindeki korunum denklemleri Fluent CFD yazılımı kullanılarak çözülmüştür. Çözümde farklı türbülans modelleri farklı duvar fonksiyonları ile kullanılmıştır. Yapılan nümerik analizler sonucunda, türbülans modelleri ve kullanılan duvar fonksiyonlarına bağlı olarak eksenel ve teğetsel hız değişimleri, oluşan basınç düşümü ve türbülans büyüklükleri incelenmiştir. Elde edilen sonuçlar literatürdeki deneysel ve nümerik sonuçlar ile karşılaştırılarak türbülans modellerinin performansları araştırılmıştır. Duvar fonksiyonlarında belirgin bir fark olmasa bile, özellikle eksenel hızın hesabında RSM türbülans modelinin oldukça başarılı olduğu görülmüştür.
FULL TEXT (PDF): 
PDF icon arastirmax-girdapli-akislarda-turbulans-modellerinin-uygunlugunun-incelenmesi.pdf
  • 1
85-96
  • Turkish

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