Numerical Simulation of Heat Transfer in A Transitional Boundary Layer With Passing Wakes  

Oleh:

Durbin, P. A. ; Wu, X.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 122 no. 2 (May 2000), page 248-257.
Topik: numerical simulation; numerical simulation; heat transfer; transitional boundary layer; wakes

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ90.1 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Direct numerical simulation (DNS) has been used to investigate heat transfer and provide thermal statistics in a transitional flow in which turbulent wakes traversing the inlet periodically are swept downstream across a constant-temperature flat - plate. The same heat transfer problem was also computed using unsteady Reynolds - averaged Navier - Stokes (RANS) method with the v2 – f turbulence model. During transition, the instantaneous Stanton number field exhibits spotlike structure, which in turn results in a strong streamwise modulation in the phase - averaged Stanton number distribution. At molecular Prandtl number Pr = 0.7, the Reynolds analogy factor decreases in the transitional region but remains nearly constant afterwards. After the completion of transition, mean and second-order temperature statistics are in good agreement with previous experimental data from slightly heated turbulent flat - plate boundary layers. Throughout the transitional and turbulent regions the turbulent Prandtl number increases sharply as the wall is asymptotically approached. DNS results at a higher wake passing frequency are also presented to illustrate the effect of freestream turbulence. Unsteady RANS predictions of the time - and phase - averaged Stanton numbers as well as the enthalpy thickness are in reasonable agreement with the DNS.

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