000009620 001__ 9620
000009620 005__ 20150325140140.0
000009620 037__ $$aTESIS-2012-110
000009620 041__ $$aspa
000009620 080__ $$a532
000009620 1001_ $$aRamírez Vázquez, Juan Antonio
000009620 24500 $$aA computational fluid dynamics investigation of turbulent swirling burners
000009620 260__ $$aZaragoza$$bUniversidad de Zaragoza, Prensas de la Universidad$$c2012
000009620 300__ $$a192
000009620 4900_ $$aTesis de la Universidad de Zaragoza$$v2012-24$$x2254-7606
000009620 500__ $$aPresentado:  06 07 2012
000009620 502__ $$aTesis-Univ. Zaragoza, Instituto de Investigación Mixto CIRCE, 2012$$bZaragoza, Universidad de Zaragoza$$c2012
000009620 520__ $$aThis thesis presents detailed numerical calculations of the Unsteady, Reynolds- Averaged Navier-Stokes (URANS) equations to simulate isothermal, single-phase flow in the geometries of realistic swirl burners at large Reynolds numbers. Simulations are run with two different turbulence closures, viz., the standard k-epsilon and Reynolds stresses (RSM) models. The numerical method is validated concerning convergence, grid density and far-field influence. Results describe a flow that is in any case periodic or pseudo-periodic, and exhibits quite convincing time-dependent features: bubble- and spiral-type vortex breakdowns and vortex core precession. Some simulations are validated by comparison with corresponding experiments. Good agreement with the experiments has been obtained for mean flow, and frequency peaks of the power spectral density of pressure fluctuations. In order to asses the reliability of URANS methods within this context, calculated time-averaged flow and coherent structures are documented via 2D graphs, spectral analysis, 3D isosurfaces and advanced, vortex-related visualization methods and 2D snapshot proper orthogonal decomposition (S-POD).  Differences arising from the nature of the turbulence model (k-epsilon vs. RSM) are very relevant indeed, given the cost factor involved and the apparent verisimilitude of the predicted flow; they are thoroughly analyzed.
000009620 6531_ $$amecánica de fluidos
000009620 6531_ $$asimulación
000009620 6531_ $$afuentes no convencionales de energía
000009620 700__ $$aCortés Gracia, Cristóbal$$edir.
000009620 7102_ $$aUniversidad de Zaragoza$$bInstituto de Investigación Mixto CIRCE
000009620 8560_ $$fzaguan@unizar.es
000009620 8564_ $$s6564029$$uhttp://zaguan.unizar.es/record/9620/files/TESIS-2012-110.pdf$$zTexto completo (spa)
000009620 909CO $$ooai:zaguan.unizar.es:9620
000009620 909co $$ptesis
000009620 909CO $$pdriver
000009620 9102_ $$aMecánica de fluidos$$bInstituto de Investigación Mixto CIRCE
000009620 980__ $$aTESIS