Tahir KARASU

2915

Kapalı Türbülanslı Çevrintili Akışların Modellemesi ve Sayısal Araştırılması

Bu orijinal araştırmada, dairesel kesitli ani genişlemeli borularda sürekli, sıkıştırılamayanve eksenel simetrik kapalı türbülanslı çevrintili akışların modellemesive sayısal araştırılması için üç farklı Reynolds sayılarında kapsamlı hesaplamalaryapılmıştır. Hibrit yöntemiyle sonlu hacim metodunu kullanarak, SIMPLE(Semi-Implicit Method for Pressure Linked Equations) algoritmasına dayanan birbilgisayar programı geliştirilmiştir. Standart k-ε türbülans modeli modellemesiyleberaber, süreklilik ve momentum korunum denklemlerinin sayısal çözümleri, iteratifbir sayısal çözüm tekniğini kullanarak sağlanmıştır. Katı cidarlar yakınındacidar fonksiyonları kullanılmıştır. Dairesel kesitli ani genişlemeli borularda çeşitlieksenel kesitlerde, eksenel hız, türbülans kinetik enerji, türbülans kinetik enerjikaybolma miktarı, efektif viskozite radyal profilleri, simetri ekseni boyunca eksenelhızın değişimi, geri akışın geometrik yeri, üst cidar boyunca cidar statik-basınçkatsayısının değişimi, üst cidar kayma gerilmesinin dağılımı ile üst cidar sürtünmekatsayısının değişimi için sayısal hesaplamalar sunulmuş ve çeşitli deneyselölçümlerle karşılaştırılarak incelenmiştir. Sayısal hesaplamaların sonuçları çeşitlideneysel ölçümlerle genel olarak iyi uyum göstermektedir.

Numerical Investigation and Modelling of Confined Turbulent Recirculating Flows

This original research work presents the results of an extensive study of numerical investigation and modelling of steady, incompressible, and axisymmetric confined turbulent recirculating flows in circular-sectioned sudden expansion pipes at three different Reynolds numbers. Employing the finite-volume method with a hybrid scheme, a computer program based on the SIMPLE (Semi-Implicit Method for Pressure Linked Equations) algorithm has been developed. Numerical solution of the conservation equations of mass and momentum, together with the standard k-ε turbulence model, are obtained using an iterative numerical solution technique. Near the solid boundaries, wall-functions are employed. Numerical predictions for radial profiles of axial velocity, turbulence kinetic energy, turbulence kinetic energy dissipation rate, effective viscosity, axial variation of centre-line velocity, locus of flow reversal, wall static-pressure coefficient, wall-shear stress and friction coefficient distributions along top wall of the axisymmetric sudden expansion pipe flow configuration are presented and compared with various experimental measurements. The results of numerical predictions show generally good agreement with various experimental data.
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Tesisat Mühendisliği-Cover
  • ISSN: 1300-3399
  • Yayın Aralığı: Yılda 6 Sayı
  • Başlangıç: 1993
  • Yayıncı: TMMOB MAKİNA MÜHENDİSLERİ ODASI
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