TY - JOUR UR - http://lib.ugent.be/catalog/pug01:513840 ID - pug01:513840 LA - eng TI - Joint Scalar versus Joint Velocity-Scalar PDF Simulations of Bluff-Body Stabilized Flames with REDIM PY - 2009 JO - (2009) FLOW TURBULENCE AND COMBUSTION SN - 1386-6184 PB - DORDRECHT Springer 2009 AU - Merci, Bart TW03 801001144859 0000-0002-2600-0098 AU - Naud, Bertrand AU - Roekaerts, Dirk AU - Maas, Ullrich AB - Two transported PDF strategies, joint velocity-scalar PDF (JVSPDF) and joint scalar PDF (JSPDF), are investigated for bluff-body stabilized jet-type turbulent diffusion flames with a variable degree of turbulence-chemistry interaction. Chemistry is modeled by means of the novel reaction-diffusion manifold (REDIM) technique. A detailed chemistry mechanism is reduced, including diffusion effects, with N (2) and CO (2) mass fractions as reduced coordinates. The second-moment closure RANS turbulence model and the modified Curl's micro-mixing model are not varied. Radiative heat loss effects are ignored. The results for mean velocity and velocity fluctuations in physical space are very similar for both PDF methods. They agree well with experimental data up to the neck zone. Each of the two PDF approaches implies a different closure for the velocity-scalar correlation. This leads to differences in the radial profiles in physical space of mean scalars and mixture fraction variance, due to different scalar flux modeling. Differences are visible in mean mixture fraction and mean temperature, as well as in mixture fraction variance. In principle, the JVSPDF simulations can be closer to physical reality, as a differential model is implied for the scalar fluxes, whereas the gradient diffusion hypothesis is implied in JSPDF simulations. Yet, in JSPDF simulations, turbulent diffusion can be tuned by means of the turbulent Schmidt number. In the neck zone, where the turbulent flow field results deteriorate, the joint scalar PDF results are in somewhat better agreement with experimental data, for the test cases considered. In composition space, where results are reported as scatter plots, differences between the two PDF strategies are small in the calculations at hand, with a little more local extinction in the joint scalar PDF results. ER -Download RIS file
00000nam^a2200301^i^4500 | |||
001 | 513840 | ||
005 | 20180813143408.0 | ||
008 | 090304s2009------------------------eng-- | ||
022 | a 1386-6184 | ||
024 | a 000263362800002 2 wos | ||
024 | a 1854/LU-513840 2 handle | ||
024 | a 10.1007/s10494-008-9162-2 2 doi | ||
040 | a UGent | ||
245 | a Joint Scalar versus Joint Velocity-Scalar PDF Simulations of Bluff-Body Stabilized Flames with REDIM | ||
260 | a DORDRECHT b Springer c 2009 | ||
520 | a Two transported PDF strategies, joint velocity-scalar PDF (JVSPDF) and joint scalar PDF (JSPDF), are investigated for bluff-body stabilized jet-type turbulent diffusion flames with a variable degree of turbulence-chemistry interaction. Chemistry is modeled by means of the novel reaction-diffusion manifold (REDIM) technique. A detailed chemistry mechanism is reduced, including diffusion effects, with N (2) and CO (2) mass fractions as reduced coordinates. The second-moment closure RANS turbulence model and the modified Curl's micro-mixing model are not varied. Radiative heat loss effects are ignored. The results for mean velocity and velocity fluctuations in physical space are very similar for both PDF methods. They agree well with experimental data up to the neck zone. Each of the two PDF approaches implies a different closure for the velocity-scalar correlation. This leads to differences in the radial profiles in physical space of mean scalars and mixture fraction variance, due to different scalar flux modeling. Differences are visible in mean mixture fraction and mean temperature, as well as in mixture fraction variance. In principle, the JVSPDF simulations can be closer to physical reality, as a differential model is implied for the scalar fluxes, whereas the gradient diffusion hypothesis is implied in JSPDF simulations. Yet, in JSPDF simulations, turbulent diffusion can be tuned by means of the turbulent Schmidt number. In the neck zone, where the turbulent flow field results deteriorate, the joint scalar PDF results are in somewhat better agreement with experimental data, for the test cases considered. In composition space, where results are reported as scatter plots, differences between the two PDF strategies are small in the calculations at hand, with a little more local extinction in the joint scalar PDF results. | ||
598 | a A1 | ||
100 | a Merci, Bart u TW03 0 801001144859 0 0000-0002-2600-0098 | ||
700 | a Naud, Bertrand | ||
700 | a Roekaerts, Dirk | ||
700 | a Maas, Ullrich | ||
650 | a Technology and Engineering | ||
653 | a JET FLAMES | ||
653 | a NONPREMIXED FLAMES | ||
653 | a MICROMIXING MODELS | ||
653 | a 2ND-MOMENT CLOSURES | ||
653 | a PROBABILITY DENSITY-FUNCTION | ||
653 | a TURBULENT REACTIVE FLOWS | ||
653 | a Bluff body stablised flames | ||
653 | a REDIM | ||
653 | a CFD | ||
653 | a Transported PDF | ||
653 | a ALGORITHM | ||
653 | a CHEMISTRY | ||
653 | a PERFORMANCE | ||
653 | a MECHANISM | ||
773 | t FLOW TURBULENCE AND COMBUSTION g Flow Turbul. Combust. 2009. Springer. 82 (2) p.185-209 q 82:2<185 | ||
856 | 3 Full Text u https://biblio.ugent.be/publication/513840/file/1136849 z [ugent] y Merci_2009_FTaC_fulltext.pdf | ||
920 | a article | ||
Z30 | x EA 1 TW03 | ||
922 | a UGENT-EA |
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