000125611 001__ 125611
000125611 005__ 20190316234312.0
000125611 037__ $$aTHESIS_LIB
000125611 245__ $$aLarge Eddy Simulation of turbulent compressible flow in heated curved square duct
000125611 269__ $$a2005
000125611 260__ $$bINPG$$c2005
000125611 336__ $$aTheses
000125611 520__ $$aCharacteristics of turbulent flow and heat transfers which develop in a heated duct are studied through Large Eddy Simulation (LES) technics . Cooling channels of rocket engines constitute one of the industrial applications. We here consider a simplified geometry consisting of a curved duct of rectangular cross section. The unsteady filtered Navier-Stokes equations are solved by means of a compact numerical scheme, predictor-corrector, second order in time, fourth in space. The subgrid scale model used is the selective structure function model. The results bring to light the development of a strong secondary flow linked with the radial pressure gradient which develops in the curved part. This secondary flow takes the shape of two counter rotating cells of Ekman type close to the convex wall. Close to the concave wall, unsteady vortices of Görtler type arise. This complex flow is thus characterised by sweeps and ejections directly linked with the heat transfer between the flow and the heated curved walls. The Nusselt number undergoes strong transverse variations which might yield material alterations of the heated wall. We evaluate the influence of the geometrical and physical parameters on the flow and the heat exchanges before proposing a solution to homogenize the heat transfers by means of passive control.
000125611 6531_ $$aNumerical simulation
000125611 6531_ $$aLarge eddy simulation
000125611 6531_ $$aTurbulent flows
000125611 6531_ $$aCurved duct
000125611 6531_ $$aHeat transfer
000125611 700__ $$0243094$$g171834$$aMünch, Cecile
000125611 720_2 $$aMétais, Olivier$$edir.
000125611 8564_ $$zURL
000125611 8564_ $$uhttps://infoscience.epfl.ch/record/125611/files/these_munch.pdf$$zn/a$$s22389805
000125611 909C0 $$xU10309$$0252135$$pLMH
000125611 909CO $$qGLOBAL_SET$$pSTI$$ooai:infoscience.tind.io:125611
000125611 937__ $$aLMH-THESIS-2008-002
000125611 973__ $$sPUBLISHED$$aOTHER
000125611 980__ $$aTHESIS