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Equations and boundary conditionsRegime TransitionsData processingRecent resultsNumerical simulations with EULAG Experimental setupEquations and boundary conditionsRegime TransitionsData processingRecent resultsNumerical simulations with EULAGOutlookContent Experimental setup Outlook PlV-and LDV-measurements of baroclinic wave interactionsin a thermally driven rotating annulus U. Harlander, Th.v. Larcher, K. Alexandrov, and C. Egbers Department of Aerodynamics and Fluid Mechanics, BTU Cottbus October 7, 2008 三 QC 1Experimental setup 2 Equations and boundary conditions 3 Regime Transitions 4 Data processing 5 Recent results Frame co-rotating with cylinder Frame co-rotating with wave LDA observations 6 Numerical simulations with EULAG Outlook 三 QC Outlook 本Q warm Fruh and Read, 1997 DeutscheForschungsgemeinschaftDFG Outlook rout =12.5cm rin=4.5cmAT=7.5K 3 cpm 三 QC Outlook PlV observation in the inertial frame Frame A Frame BProblems How to switch to co-rotating frame? ve=v-x7 How to get rid of the shadow? 卜三> 三 QC Outlook PIV velocity,vmax=0.019831(Bild Nummer:116) Zenter:x0=119.5 y0=137 PIV velocity, vmax=0.025898(Bild Nummer:117) Zenter:x0=119.5 y0=137.2 250 200 50 0 50 100 150 200 250 Zweite Aufnahme wird in 180 Grad gedreht The heated rotating annulus Outlook Results: mean flow Harlander, Wang, Egbers (2008), proceedings Laser conference, Lisbon BTU Experimental setup Frame co-rotating with cylinder Frame co-rotating with wave LDA observations Outlook Different names for the same thing: POD, EOF, PCA, Factor Analysis, Karhunen-Loewe-Expansion,…. Data matrix Covariance matrix R=F'F ai= Fv: Explained variance y of v is defined as y :=i=1X 三 三> 三 QC LDA observations Outlook Results: variability DeutscheForschungsgemeinschaftDFG 三 QC LDA observations Results: variability DeutscheForschungsgemeinschaftDFG QC LDA observations Numerical simulations with EULAG Outlook Resu ts: variability BTU DeutscheForschungsgemeinschaftDFG 三 Outlook Results: mean flow Laser slicePIV: time mean flow Harlander & Wang, BTU Cottbus 2008 DeutscheForschungsgemeinschaftDFG 三卜<三> QC Outlook Results: variability DeutscheForschungsgemeinschaftDFG 三 QC LDA observations Numerical simulations with EULAG Outlook Resu ts: variability BTU DeutscheForschungsgemeinschaftDFG LDA principle BTUSource http://laum-vld.univ-lemans.fr 三 三 三 QC LDA observations 寸O -arlander, v. Larcher, Wang, and Egbers (2008) 三 三 三 LDA observations 1000 寸OE Azimuth D=0-2元 Parameters heating/cooling ±0.2K/s time 100s no rotation Parameters heating/cooling ±0.2K/s time 100 +50s rotation 7.6cpm 25 Outlook Future activities CombiningPlV and thermography: can we estimate velocity fromtemperature? 20E 30EIE 25S Breaking azimuthal symmetry of the annulus: still regular flows? Irregular regime: is the wave breaking symmetric? 三 QC Outlook Acknowledgement Our work is part of the priority program MetStrom by the DeutscheForschungsgemeinschaft. Financial support is gratefully acknowledged. DeutscheForschungsgemeinschaftDFG 三 QC >The heated rotating annulusEULAG workshop, Bad Tolz, October , <>卜The heated rotating annulusEULAG workshop, Bad Tolz, October ,
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