Turbulent Natural Convection in a Vertical Channel Flow

Turbulent Natural Convection in a Vertical Channel Flow ERCOFTAC SIG 15 Workshop 15 th of October 2019 Cédric Flageul

Vertical Channel flow: L 1 >> L 2 15/10/2019 Turbulent Natural Convection in a Vertical Channel Flow ERCOFTAC SIG 15 Workshop, Ljubljana 2

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Pr = 0. 71 15/10/2019 Turbulent Natural Convection in a Vertical Channel Flow ERCOFTAC SIG 15 Workshop, Ljubljana 4

Gr = 2. 106 Gr=3. 106 Dimokratis Grigoriadis, Univ. Cyprus, LES CS => Smagorinsky FSF => Filtered Structure Function Dean Wilson, Univ. Manchester, RANS Momentum: LS => Launder and Sharma (1974) HJ => Jakirlić and Hanjalić (1995) JY => Cubic non-linear k-eps (Craft et al. , 2000) Heat flux: SG => Simple gradient diffusion EG => Generalised gradient with EVM GG => Generalised gradient diffusion HK => Algebraic heat flux model (Hanjalić et al. , 1996) 15/10/2019 Jameel Syed Mohd Saad, Univ. Pau, RANS k-omega SST BL-v 2/k Launder-Sharma Modifications of the model + Sensitivity analysis Turbulent Natural Convection in a Vertical Channel Flow ERCOFTAC SIG 15 Workshop, Ljubljana 5

Channel at Gr=2. 106 : • Pressure (not for LES) • Turbulent kinetic energy • Temperature • Velocity • Wall-normal turbulent heat flux • Streamwise turbulent heat flux (not for SGDH RANS models) • Nusselt numbers • Temperature variance (only for LES and AFM RANS) 15/10/2019 Turbulent Natural Convection in a Vertical Channel Flow ERCOFTAC SIG 15 Workshop, Ljubljana 6

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Channel at Gr=3. 106 : • Pressure • Turbulent kinetic energy • Temperature • Velocity • Wall-normal turbulent heat flux • Streamwise turbulent heat flux • Nusselt numbers • Temperature variance (only LES) 15/10/2019 Turbulent Natural Convection in a Vertical Channel Flow ERCOFTAC SIG 15 Workshop, Ljubljana 16

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Gr = 2. 106 Gr=3. 106 Dimokratis Grigoriadis, Univ. Cyprus, LES CS => Smagorinsky FSF => Filtered Structure Function Dean Wilson, Univ. Manchester, RANS Momentum: LS => Launder and Sharma (1974) HJ => Jakirlić and Hanjalić (1995) JY => Cubic non-linear k-eps (Craft et al. , 2000) Heat flux: SG => Simple gradient diffusion EG => Generalised gradient with EVM GG => Generalised gradient diffusion HK => Algebraic heat flux model (Hanjalić et al. , 1996) 15/10/2019 Jameel Syed Mohd Saas, Univ. Pau, RANS k-omega SST BL-v 2/k Launder-Sharma Modifications of the model + Sensitivity analysis Turbulent Natural Convection in a Vertical Channel Flow ERCOFTAC SIG 15 Workshop, Ljubljana 19

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