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Final meeting, Brussels, 28-29 Sept, 2004

3D hill flow, Test Case 26

Lars Davidson

Dept. of Thermo and Fluid DynamicsChalmers University of Technology, Goteborg, Sweden

E-mail lada@tfd.chalmers.sehttp://www.tfd.chalmers.se/� lada

Presentation at the Flomania Final Review Meetinghttp://cfd.me.umist.ac.uk/flomania/

1

Final meeting, Brussels, 28-29 Sept, 2004

ICSTM: RANS, low-Re RSM, � � � � �� � �� mesh

FOI: RANS, EARSM, � � � � � � � � � mesh

UMIST: RANS, Wilcox � � , � � � � �� � �� mesh

SPTU: RANS, 1-eq. Spalart-Allmaras, � � � � � � � � � mesh

EDF: LES, � cells (unstructured)

Chalmers: Hybrid LES-RANS, with forcing, � � � �� � � � mesh

2

Final meeting, Brussels, 28-29 Sept, 2004

� ��

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Neumann outlet B.C.

�DNS data at inlet

3

Final meeting, Brussels, 28-29 Sept, 2004

RA

NS

— EARSM; � � � � ; — 1-eq. SA; � � Low-Re RSM

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4

Final meeting, Brussels, 28-29 Sept, 2004

RA

NS

— EARSM; � � � � ; — 1-eq. SA; � � Low-Re RSM

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0.2

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5

Final meeting, Brussels, 28-29 Sept, 2004

0 0.5 1 1.5 2 2.50

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LES-RANS

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LES

6

Final meeting, Brussels, 28-29 Sept, 2004

−2.5 −2 −1.5 −1 −0.5 00

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7

Final meeting, Brussels, 28-29 Sept, 2004

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8

Final meeting, Brussels, 28-29 Sept, 2004

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9

Final meeting, Brussels, 28-29 Sept, 2004

0 1 2 3−2

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10

Final meeting, Brussels, 28-29 Sept, 2004

RA

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11

Final meeting, Brussels, 28-29 Sept, 2004

— EARSM; � � � ; � � Low-Re RSM

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RANS

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LES-RANS

12

Final meeting, Brussels, 28-29 Sept, 2004

SUMMARY

� All RANS models give a completely incorrect flow field

� LES and hybrid LES-RANS in good agreement with expts.

� However, it seems that the LES/LES-RANS predictions fail tocapture a recirculation region near the crest of the hill.

� Mesh sizesRANS � � � �� � million (half of the domain)LES � � millionHybrid LES-RANS �� � million

� CPU timesRANS, EARSM � � � days 1-CPU DEC-AlphaRANS, RSM � hours 4-CPU P4RANS SA 1-eq � �� � 2-CPU P3, 1000 MHzLES � weeks 1-CPU, Fujitsu VPP5000LES-RANS � week (10+10 through flows) 1-CPU Opteron 244

13

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