Predictions of A Turbulent Separated Flow Using Commercial CFD Codes  

Oleh:

Iaccarino, Gianluca

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Fluids Engineering vol. 123 no. 4 (2001), page 819-828.
Topik: Prediction; predictions; separated flow; commercial; CFD codes

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ89.4 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Numerical simulations of the turbulent flow in an asymmetric two - dimensional diffuser are carried out using three commercial CFD codes : CFX, Fluent, and Star - CD. A low - Reynolds number k - E model with damping functions and the four - equation u(r2) – f model are used ; the first one is available as a standard feature in all the codes, the u(r2) – f model was implemented using the User Defined Routines. The flow features a large recirculating zone due to the adverse pressure gradient in the diffuser ; the u(r2) – f predictions agree very well with the experiments both for the mean velocity and the turbulent kinetic energy. The length of the separation bubble is also computed within 6 percent of the measured value. The k - E calculations do not show any recirculation and the agreement with the measurements is very poor. The three codes employed show very similar characteristics in terms of convergence and accuracy ; in particular, the results obtained using the u(r2) – f are consistent in all the codes, while appreciable differences are obtained when the k - E is employed.

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