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Turbulence models for viscoelastic fluids
Başlık:
Turbulence models for viscoelastic fluids
Yazar:
Masoudian, Mohammadali, author.
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (230 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 76-07C.
Özet:
The main objectives of this thesis are the increase of our understanding and knowledge about turbulence in wall-dominated flows of viscoelastic homogeneous polymer solutions described by the Finitely Extensible Nonlinear Elastic-Peterlin (FENE-P) rheological constitutive model and the development of turbulence models for the prediction of their flows in the context of the Reynolds-averaged Navier-Stokes (RANS) philosophy. To fulfill these objectives extensive direct numerical simulations (DNS) of fully-developed channel flow were carried out for the whole range of drag reduction, i.e. from low (12%) to the high drag reduction (75%) and from very low (Retau=125) to high Reynolds numbers (Retau=590). This DNS database was used to develop RANS closures, to validate the performance of the developed RANS models and also to perform a a-priori analyses of the filtered governing equations, as explained next.
Using direct numerical simulation data of turbulent plane channel flow of homogeneous polymer solutions, the a-priori analyzes of the filtered momentum and FENE-P constitutive equations were performed for the first time for viscoelastic fluids. In this part of the work the influence of polymer additives on the subgrid scale (SGS) stress tensor was quantified, and it was found that polymers lead to a severe suppression of SGS stresses. Moreover, the budget of the filtered FENE-P constitutive equation was analyzed, and suggestions for development of the SGS closures for viscoelastic fluids, in the context of large eddy simulations (LES) closures were proposed. This part of the work provided us also with insight for developing SGS models for viscoelastic fluids in the near-future, but outside the scope of this thesis.
Notlar:
School code: 5896
Tüzel Kişi Ek Girişi:
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(678865.1) | 678865-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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