9-Apr-2008 WALLTURB meeting at ONERA Toulouse WALLTURB: CFD results on Surrey Bump WALLTURB Presented by Jerry Benton

WALLTURB meeting at ONERA Toulouse

9-Apr-2008

WALLTURB: CFD results on Surrey Bump

WALLTURB

Presented by

Jerry Benton

9-Apr-2008 WALLTURB meeting at ONERA Toulouse Page 2© A

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Surrey bump. Medium mesh

Medium: X=-7.76mFine: X=-8.129mLength of plate adjusted to match measured momentum thickness at x=-1.534m.Transition fixed at 0.1m from plate leading edge.

Fine mesh has approx double the number of points in bl normal to wall compared to medium mesh, same spacing in viscous sublayer, same streamwise spacing.

3m

Inflow region

Plate

Top wall Colours indicate mesh blocks

Viscous sublayer: mesh adjusted so 1st cell y+ is in range 0.8 to 1 everywhere (though this cannot be maintained through separation region). Then 2nd and 3rd cells have same height as 1st.

Viscous walls

Inviscid walls

Y=0.5m

Y=0.0m

X=0 X=+1.456m

Bump

X=+0.77m

X=-1.534m X=0


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Flow details

• 2D only - no sidewall boundary layer• Upstream plate length adjusted (for each mesh) so momentum thickness

matches experiment at upstream reference point x=-1.534m• Re() matches experiment at x=-1.534m• Same inflow “leading edge” top and bottom, and same position, despite

different geometry and bl suction in experiment • U velocity is always x-direction, not tangential• 2 turbulence models used:

• kw Menter baseline (BSL)• kw Menter SST

• All CFD plots show 3 results (except 1 slide on flat plate zpg):• Blue: medium mesh kw BSL• Black: fine mesh, kw BSL• Red: fine mesh, kw SST

• Solver: structured multiblock, compressible, run at inflow M ~ 0.18• Spatial discretisation is 2nd order.• Scalar dissipation, set at relatively low level, purely 3rd order in absence of

shocks, inversely scaled with local viscosity, no preconditioning


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y+ of 1st cell centre

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-10 -8 -6 -4 -2 0 2 4 6

Y1+

X

medium mesh Re1=0.66e6 kw Menter BSL bc7 fine mesh Re1=0.66e6 kw Menter BSL bc7 fine mesh Re1=0.66e6 kw Menter SST bc7


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Cp in bump region

-2

-1.5

-1

-0.5

0

0.5 0 0.5 1 1.5 2

CP

X

Surrey Uref=10m/s bump surface centreline z=0 X/1000medium mesh Re1=0.66e6 kw Menter BSL bc7 fine mesh Re1=0.66e6 kw Menter BSL bc7 fine mesh Re1=0.66e6 kw Menter SST bc7

Compressibility effects?

Kw SST tends to overpredict separation

Kw BSL tends to underpredict separation


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Cf in bump region

-0.002

0

0.002

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0.006

0.008

0.01

0.012

0.014

0 0.5 1 1.5 2 2.5

CF

X

medium mesh Re1=0.66e6 kw Menter BSL bc7 fine mesh Re1=0.66e6 kw Menter BSL bc7 fine mesh Re1=0.66e6 kw Menter SST bc7


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U profile at x=-1.534m

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Ydi

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U/Uref

Surrey single wire U/Uref/1.0132 Ydist/1000Surrey x-wire probe in u-v plane U/Uref/1.0137 Ydist/1000Surrey x-wire probe in u-w plane U/Uref/1.0111 Ydist/1000medium mesh Re1=0.66e6 kw Menter BSL bc7 X=-1.534 U/Uref/1.01151fine mesh Re1=0.66e6 kw Menter BSL bc7 X=-1.534 U/Uref/1.01236fine mesh Re1=0.66e6 kw Menter SST bc7 X=-1.534 U/Uref/1.00973


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U profile at x=-1.534m, wall units

0

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U+

Y+

Viscous sublayer u+ = y+ Log layer u+ = 1/.41 ln(y+) + 5 Log layer u+ = 1/.38 ln(y+) + 4.08 medium mesh Re1=0.66e6 kw Menter BSL bc7 X=-1.534fine mesh Re1=0.66e6 kw Menter BSL bc7 X=-1.534fine mesh Re1=0.66e6 kw Menter SST bc7 X=-1.534


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U profile at x=-0.336m

0

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U/Uref

Surrey single wire U/Uref/1.0132 Ydist/1000Surrey x-wire probe in u-v plane U/Uref/1.0137 Ydist/1000Surrey x-wire probe in u-w plane U/Uref/1.0111 Ydist/1000medium mesh Re1=0.66e6 kw Menter BSL bc7 X=-0.336 U/Uref/1.01151fine mesh Re1=0.66e6 kw Menter BSL bc7 X=-0.336 U/Uref/1.01236fine mesh Re1=0.66e6 kw Menter SST bc7 X=-0.336 U/Uref/1.00973


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U profile at x=-0.336m, wall units

0

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U+

Y+

Viscous sublayer u+ = y+ Log layer u+ = 1/.41 ln(y+) + 5 Log layer u+ = 1/.38 ln(y+) + 4.08 medium mesh Re1=0.66e6 kw Menter BSL bc7 X=-0.336fine mesh Re1=0.66e6 kw Menter BSL bc7 X=-0.336fine mesh Re1=0.66e6 kw Menter SST bc7 X=-0.336


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Flat plate zpg validation for Re(L)=1,10,100milInfluence of turbulence model

0

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U+

Y+

Viscous sublayer u+ = y+ Log layer u+ = 1/.41 ln(y+) + 5 Log layer u+ = 1/.38 ln(y+) + 4.08 fine mesh ReL=001e6 kw Menter BSL bc7 I=100fine mesh ReL=010e6 kw Menter BSL bc7 I=100fine mesh ReL=100e6 kw Menter BSL bc7 I=100fine mesh ReL=001e6 kw Menter SST bc7 I=100fine mesh ReL=010e6 kw Menter SST bc7 I=100fine mesh ReL=100e6 kw Menter SST bc7 I=100


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U profiles at x=-1.534 and x=-.336

• Question re overprediction of mean velocity cf measurements at x=-1.534m and x=-.336m in the range y=.01 to .04m

• Could this be due to 3D effects, specifically that the core flow acceleration due to the sidewall boundary layer is not maintained into the lower part of the bottom plate and top wall bl?

• A physical argument could be that the full displacement effect of the sidewall bl, as felt by the core flow, is not fully maintained in the tunnel corner regions, the total displacement effect here being shared between plate and sidewall bl, and not equal to the sum of the displacement thicknesses at the centreline of each bl.

• The idea is that this shortfall in displacement is then propagated across the plate and top wall bl.

• A 3D CFD study would be useful to investigate this.


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U profile at x=+0.770m

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Ydi

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U/Uref

Surrey measurements in u-v plane Ydist/1000Surrey measurements in u-w plane Ydist/1000medium mesh Re1=0.66e6 kw Menter BSL bc7 X=+0.770 U/Uref/1.01151fine mesh Re1=0.66e6 kw Menter BSL bc7 X=+0.770 U/Uref/1.01236fine mesh Re1=0.66e6 kw Menter SST bc7 X=+0.770 U/Uref/1.00973


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U profile at x=+0.770m near wall

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U/Uref



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-uv profile at x=+0.770m

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-uv/Uref2

Surrey measurements in u-v plane Ydist/1000medium mesh Re1=0.66e6 kw Menter BSL bc7 X=+0.770 -uv/Uref2/.057426fine mesh Re1=0.66e6 kw Menter BSL bc7 X=+0.770 -uv/Uref2/.057393fine mesh Re1=0.66e6 kw Menter SST bc7 X=+0.770 -uv/Uref2/.057095


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U/Uref

medium mesh Re1=0.66e6 kw Menter BSL bc7 X=+1.400 U/Uref/1.01151fine mesh Re1=0.66e6 kw Menter BSL bc7 X=+1.400 U/Uref/1.01236fine mesh Re1=0.66e6 kw Menter SST bc7 X=+1.400 U/Uref/1.00973


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-uv/Uref2

medium mesh Re1=0.66e6 kw Menter BSL bc7 X=+1.400 -uv/Uref2/.057426fine mesh Re1=0.66e6 kw Menter BSL bc7 X=+1.400 -uv/Uref2/.057393fine mesh Re1=0.66e6 kw Menter SST bc7 X=+1.400 -uv/Uref2/.057095


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U profile at x=+2.000m, wall units

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0.1 1 10 100 1000 10000 100000

U+

Y+

Viscous sublayer u+ = y+ Log layer u+ = 1/.41 ln(y+) + 5 Log layer u+ = 1/.38 ln(y+) + 4.08 medium mesh Re1=0.66e6 kw Menter BSL bc7 X=+2.000fine mesh Re1=0.66e6 kw Menter BSL bc7 X=+2.000fine mesh Re1=0.66e6 kw Menter SST bc7 X=+2.000


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Future work

• Surrey experiment: further checks/refinement of numerical issues

• Alternative turbulence models

• Transonic wing-body (HiReTT)

• Lille and Czestochowa experiments


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Documents

9-Apr-2008 WALLTURB meeting at ONERA Toulouse WALLTURB: CFD results on Surrey Bump WALLTURB Presented by Jerry Benton