Prediction Capability of RANS Turbulence Models for Asymmetrically Heated High-Aspect-Ratio Duct Flows

Kaller, Thomas; Hickel, Stefan; Adams, Nikolaus A.

doi:10.2514/6.2020-0354

Cited by 2 publications

(5 citation statements)

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“…The small vortex strength is significantly underestimated in the RANS, whereas the large vortex strength agrees well with the LES data. Using other turbulence models than the BSL RSM, the results deviate further from the LES, see [17]. When heating is applied the secondary flow strength becomes weaker along the duct, [19].…”

Section: Flow and Temperature Fieldmentioning

confidence: 91%

“…To close the equation system approximations for ρu i u j and ρu i h are required. Reference [17] showed, that the ω-based BSL RSM gives the overall best results for the HARCD setup. Additional PDEs are solved for each component of ρu i u j and the specific dissipation ω.…”

Section: Equation System and Numerical Modelmentioning

confidence: 99%

“…The adiabatic periodic section is 50 × 25.8 × 6 mm 3 and the heated section is 600 × 25.8 × 6 mm 3 . The straight part is followed by a curved section, which is not part of the current study and analysed in [17]. The grid resolution for the well-resolved RANS has been determined with an extensive grid sensitivity study based on the periodic section and satisfies y + ≈ 1 for the adiabatic and heated walls.…”

Section: Simulation Setupmentioning

confidence: 99%

“…For the latter u T ≈ 0 due to the negligible streamwise temperature gradient. The u Tmaximum close to the heated wall cannot be represented by the RANS, see [17] for further details. The wall-normal turbulent heat flux is overestimated for all considered RANS models.…”

Section: Flow and Temperature Fieldmentioning

confidence: 99%

“…In the first part of the present study an asymmetrically heated high aspect ratio cooling duct (HARCD) at Re b = 110 • 10 3 and a moderate heating of T W − T b = 40 K is investigated using the BSL RSM and various turbulent heat flux closure models with ANSYS CFX. This setup has been studied experimentally, [28], and using a LES, [16][17][18][19] serving as comparison database. In the second part a cryogenic transcritical channel at Re b = 16 • 10 3 is investigated with the BSL RSM and various turbulent heat flux closure models with ANSYS FLUENT.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Assessment of RANS Turbulence Models for Straight Cooling Ducts: Secondary Flow and Strong Property Variation Effects

Kaller

Doehring

Hickel

et al. 2020

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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We present well-resolved RANS simulations of two generic asymmetrically heated cooling channel configurations, a high aspect ratio cooling duct operated with liquid water at $$Re_b = 110 \times 10^3$$ and a cryogenic transcritical channel operated with methane at $$Re_b = 16 \times 10^3$$. The former setup serves to investigate the interaction of turbulence-induced secondary flow and heat transfer, and the latter to investigate the influence of strong non-linear thermodynamic property variations in the vicinity of the critical point on the flow field and heat transfer. To assess the accuracy of the RANS simulations for both setups, well-resolved implicit LES simulations using the adaptive local deconvolution method as subgrid-scale turbulence model serve as comparison databases. The investigation focuses on the prediction capabilities of RANS turbulence models for the flow as well as the temperature field and turbulent heat transfer with a special focus on the turbulent heat flux closure influence.

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Section: Flow and Temperature Fieldmentioning

confidence: 91%

Section: Equation System and Numerical Modelmentioning

confidence: 99%

Section: Simulation Setupmentioning

confidence: 99%

Section: Flow and Temperature Fieldmentioning

confidence: 99%