Near-field Pressure Signature Prediction by JAXA...Near-field Pressure Signature Prediction by JAXA Hiroaki ISHIKAWA (ASIRI) Yoshikazu MAKINO (JAXA) Atsushi UENO (JAXA) Yohei KASUGA

Near-field Pressure Signature Prediction

by JAXA

Hiroaki ISHIKAWA (ASIRI)

Yoshikazu MAKINO (JAXA)

Atsushi UENO (JAXA)

Yohei KASUGA (University of Tokyo)

Outline

I. Summary of cases analyzed

II. Flow solver / Computing platform Flow solver (TAS)

Computing platform : JSS2

III. JWB Design method and Wind tunnel test schedule

Flow solver convergence

Limiter function

Results

IV. AXIE

V. C25D

VI. Comparison AXIE, JWB, C25D

VII. Conclusion

Summary of cases analyzed

Model Providor viscousity meshmixed 2.56 2 1.6 1.28 1

tetrahedra 2.56 2 1.6 1.28 1jwb SBPW inviscid tetrahedra 1 0.83 0.7

mixed 2 1.6 1.28 1 0.8 0.64tetrahedra 2 1.6 1.28 1 0.8

Grid Spacing(Resolution)

axie

c25d-flowthru

SBPW

SBPW

inviscid

inviscid

axie

C25D

JWB

Propagation (optional) analysis are carried out for above cases.

Flow solver/Computing Platform

Solver TAS

Tohoku university Aerodynamic Simulation

developer Tohoku university & JAXA

Mesh Unstructured mesh

cell-vertex finite volume

discretization scheme HLLEW

spatial accuracy 2nd order

limiter function Venkatakrishnan

time integration LU-SGS implicit method

Equation Euler

CFD solver

Computing PlatformJSS2 SORA-MA- JAXA Supercomputer System generation 2

- Fujitsu Supercomputer PRIMEHPC FX100

- Architecture: Scalar machine

- Processor Type = SPARC64 Xlfx (32 cores/node)

- Nodes/System = 3,240 nodes

- Memory/Node = 32GiB

- Memory/System = 101.25TiB

- Peak Performance = 3.495 PFLOPS

3-400 processors x 2-3.5h for SBPW2

Propagation(Optional) Xnoise : Burgers equation MPnoise : Multi-pole method

Boom metre : Loudness estimation

Details will be presented by Knamori

(tommrrow).

JWB

viscousity meshinviscid tetrahedra 1 0.83 0.7


JAXA Wing Body (JWB) designed

• Step 1; Equivalent area (AE) based optimization– Euler analysis to evaluate lift component of equivalent area.

– Free-form deformation (FFD) to optimize body shape.

• Step 2; Reversed equivalent area (AE,r) based optimization– Euler analysis to evaluate near-field pressure distribution.

– Multi-pole analysis to consider pressure propagation in circumferential direction.

AE_lift

AE_volume

pole08

pole12pole16

pole20pole24Input

-20 0 20 40 60 80 100-0.04

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

Multi-pole analysisEuler analysis

Euler analysis

AE

AE,r


0 4 8 12 16 20 24 28 32 36 40

1

2

3

4

• Optimization of body shape to meet NASA 25D

– Wing was fixed. AE optimized shape

FFD

Euler analysis

End

No

Yes

Yes

NoMeet target

AE,r?

Multipole analysis

AE,r

Meet target

AE_body?

Target AE_body

Target AE,r

Xs [m]

Re

ve

rse

d e

qu

iva

len

t a

rea

[m

2]

NASA 25DTarget AE_body

Initial AE_body

Initial shape

Designed shape


0 4 8 12 16 20 24 28 32 36 40

1

2

3

4

5

Boom signature at ground

Time [ms]

Ove

rpre

ssu

re (

RF

=1.9

) [p

sf]

h=15,760m

Equivalent area

Xs [m]

Re

ve

rse

d e

qu

iva

len

t a

rea

[m

2]

75.1 PLdB; NASA 25D

84.7 PLdB; AE optimized

78.9 PLdB; AE,r optimized

-20 0 20 40 60 80 100 120 140-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

Wind tunnel test

Wind Tunnel Testing will be held in 2 weeks.

-0.006

-0.003

0

0.003

0.006

-10 0 10 20 30 40 50 60 70 80

DP

/Pin

f

X(m)

10003000500070009000

H/L=2.55, f=0deg

-0.012

-0.008

-0.004

0

0.004

0.008

0.012

-10 0 10 20 30 40 50 60 70 80

DP

/Pin

f

X(m)

10003000500070009000

H/L=0.85, f=0deg

0.90

0.92

0.94

0.96

0.98

1.00

1.02

1.04

1.E-13

1.E-11

1.E-09

1.E-07

1.E-05

1.E-03

1.E-01

1.E+01

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

D/D

fin

al

Re

sid

ua

l

Iteration

Residual

D/Dfinal

Flow solver convergence

9000

converged

7000-9000

converged

Limiter Function

Venkatakrishnan limiter (AIAA 93-080)

DDDD

DDDD

D

222

222

2/12

21

i

32 D K

where is an average grid size and K is a constant (limiter factor).D

Low

High

High

Low

K Stability Accuracy Provided data

1 JWB

0.1

0.01 C25D

0.001 AXIE

Limiter factor, K

Limiter Function

K=1.0 0.1 0.01 0.001

Different

Limiter Function :K=1.0

Limiter Function

K=0.001K=0.01K=0.1K=1

-0.006

-0.004

-0.002

0

0.002

0.004

0.006

-20 0 20 40 60 80 100

DP

/Pin

f

X(m)

K=0.001

K=0.01

K=0.1

K=1

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150 200

DP, P

a

Time, msec

K=0.001

K=0.01

K=0.1

K=175

76

77

78

79

80

81

0.001 0.01 0.1 1

SP

L, P

Ld

B

Limiter factor: K

Near Field (H/L=2.55)

Ground Signature Loudness

Front shocks same

Aft shocks different

K=0.001 blunt

K=1 is sharp and same as K=0.1

K=1 is used for JWB simulation.

Near field

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50 60

DP

/Pin

f

X(m)

100

083

070

H/L=0.85, f=0deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50 60

DP

/Pin

f

X(m)

100

083

070

H/L=0.85, f=30deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50 60

DP

/Pin

f

X(m)

100

083

070

H/L=0.85, f=50deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50 60

DP

/Pin

f

X(m)

100

083

070

H/L=2.55, f=0deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50 60

DP

/Pin

f

X(m)

100

083

070

H/L=2.55, f=30deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50 60

DP

/Pin

f

X(m)

100

083

070

H/L=2.55, f=50deg

Grid dependency is not observed among 100 – 070.

f=0 1020

30

H/L

=2

.55

H/L

=0

.85

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP, P

a

X(m)

H/L=0.85

H/L=2.55

070, f=10deg

Ground & Loundness

100083070

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150D

P, P

a

X(m)

100

083

070

H/L=0.85, f=0deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

100

083

070

H/L=0.85, f=30deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

100

083

070

H/L=0.85, f=50deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

100

083

070

H/L=2.55, f=0deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

100

083

070

H/L=2.55, f=30deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

100

083

070

H/L=2.55, f=50deg

70

75

80

85

90

0 10 20 30 40 50 60

SP

L, P

Ld

B

f, deg

100, H/L=0.85 083, H/L=0.85 070, H/L=0.85

100, H/L=2.55 083, H/L=2.55 070, H/L=2.55

Ground Signature

Loudness

f=0 1020

30

H/L

=2

.55

H/L

=0

.85

AXIE

Model Providor viscousity mesh

mixed 2.56 2 1.6 1.28 1

tetrahedra 2.56 2 1.6 1.28 1


axie SBPW inviscid

Limiter Factor, K=0.1

Oscillations


Oscillations


Oscillations disappear.

K=0.001 is used for AXIE.

axie-inv-mixed-256, K=0.1

Provided mesh

Better for TAS code

TAS code is sensitive for mesh quality.

C25D viscous and powered could not be solved using provided grid from SBPW2.

Near Field Propagation

Grid spacing is changed.

Cut the Near-field signature.

Propagate

Ground level

sonic boom

1.7L(0.12sec)

256200160128100

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

256 200

160 128

100

H/L=1, f=0deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

256 200

160 128

100

H/L=3, f=0deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

256 200

160 128

100

H/L=5, f=0deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150 200

DP, P

a

X(m)

256 200160 128100

H/L=1, f=0deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150 200

DP, P

a

X(m)

256 200160 128100

H/L=3, f=0deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150 200

DP, P

a

X(m)

256 200160 128100

H/L=5, f=0deg

256200160128100

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

256 200

160 128

100

H/L=1, f=0deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

256 200

160 128

100

H/L=3, f=0deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

256 200

160 128

100

H/L=5, f=0deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150 200

DP, P

a

X(m)

256 200160 128100

H/L=1, f=0deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150 200

DP, P

a

X(m)

256 200160 128100

H/L=3, f=0deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150 200

DP, P

a

X(m)

256 200160 128100

H/L=5, f=0deg

Near-field & Ground (f=0deg)

Mixed

Near-field Ground

TetraNear-field Ground

H/L

=1

H/L

=3

H/L

=5

Mixed series have similar characteristics as Tetra series.

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150 200

DP, P

a

X(m)

256 200160 128100

H/L=1, f=0deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150 200

DP, P

a

X(m)

256 200160 128100

H/L=3, f=0deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150 200

DP, P

a

X(m)

256 200160 128100

H/L=5, f=0deg

10

15

20

0 10 20 30

DP, P

a

X(m)

256 200160 128100

H/L=1, f=0deg

10

15

20

0 10 20 30

DP, P

a

X(m)

256 200160 128100

H/L=3, f=0deg

10

15

20

0 10 20 30

DP, P

a

X(m)

256 200160 128100

H/L=5, f=0deg

AXIE-mixed

100-160 are almost same. converged128-160 are almost same.

But 100 is different.

H/L=1 H/L=3 H/L=5

AXIE-mixed : 100 vs 128

mixed-100 mixed-128

Oscillations appear again even at K=0.001.

Loudness of AXIE

70

75

80

85

90

0.5 1 1.5 2 2.5 3

SP

L, P

Ld

B

Grid spacing

mixed, H/L=1 mixed, H/L=3 mixed, H/L=5

tetra, H/L=1 tetra, H/L=3 tetra, H/L=5

100 128 160200

256

100-160 are almost same. converged

almost same

C25D (Flow through)

Model Providor viscousity meshmixed 2 1.6 1.28 1 0.8 0.64

tetrahedra 2 1.6 1.28 1 0.8


c25d-flowthru SBPW inviscid

Near field: mixedH

/L=

1H

/L=

3H

/L=

5

f=010

20

30

40

50

200160128100080064

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080 064

H/L=1, f=0deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080 064

H/L=1, f=30deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080 064

H/L=1, f=50deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080 080

H/L=3, f=0deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080 064

H/L=3, f=30deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080 064

H/L=3, f=50deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080 064

H/L=5, f=0deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080 064

H/L=5, f=30deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080 064

H/L=5, f=50deg

H/L

=1

H/L

=3

H/L

=5

f=0(deg) f=30(deg) f=50(deg)

Near field: tetraH

/L=

1H

/L=

3H

/L=

5

f=010

20

30

40

50

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080

H/L=1, f=0deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080

H/L=1, f=30deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080

H/L=1, f=50deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080

H/L=3, f=0deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080

H/L=3, f=30deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080

H/L=3, f=50deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080

H/L=5, f=0deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080

H/L=5, f=30deg

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

-10 0 10 20 30 40 50

DP

/Pin

f

X(m)

200 160

128 100

080

H/L=5, f=50deg

H/L

=1

H/L

=3

H/L

=5


Ground: mixedH

/L=

1H

/L=

3H

/L=

5

f=010

20

30

40

50

200160128100080064

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150D

P, P

a

X(m)

200 160

128 100

080 064

H/L=1, f=0deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

200 160

128 100

080 064

H/L=1, f=30deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

200 160

128 100

080 064

H/L=1, f=50deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

200 160

128 100

080 080

H/L=3, f=0deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

200 160

128 100

080 064

H/L=3, f=30deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

200 160

128 100

080 064

H/L=3, f=50deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

200 160

128 100

080 064

H/L=5, f=0deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

200 160

128 100

080 064

H/L=5, f=30deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

200 160

128 100

080 064

H/L=5, f=50deg

H/L

=1

H/L

=3

H/L

=5


Ground: tetraH

/L=

1H

/L=

3H

/L=

5

f=010

20

30

40

50

200160128100080

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150D

P, P

a

X(m)

200 160

128 100

080

H/L=1, f=0deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

200 160

128 100

080

H/L=1, f=30deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

200 160

128 100

080

H/L=1, f=50deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

200 160

128 100

080

H/L=3, f=0deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

200 160

128 100

080

H/L=3, f=30deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

200 160

128 100

080

H/L=3, f=50deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

200 160

128 100

080

H/L=5, f=0deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

200 160

128 100

080

H/L=5, f=30deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP

, P

a

X(m)

200 160

128 100

080

H/L=5, f=50deg

H/L

=1

H/L

=3

H/L

=5


Loudness : Grid dependencyH

/L=

1H

/L=

3H

/L=

5

f=010

20

30

40

50

70

75

80

85

90

0 10 20 30 40 50 60

SP

L, P

Ld

B

f, deg

200

160

128

100

080

064

from H/L=3

70

75

80

85

90

0 10 20 30 40 50 60

SP

L, P

Ld

B

f, deg

200

160

128

100

080

064

from H/L=5

70

75

80

85

90

0 10 20 30 40 50 60

SP

L, P

Ld

B

f, deg

200

160

128

100

080

064

from H/L=1

70

75

80

85

90

0 10 20 30 40 50 60

SP

L, P

Ld

B

f, deg

200

160

128

100

080

from H/L=1

70

75

80

85

90

0 10 20 30 40 50 60

SP

L, P

Ld

B

f, deg

200

160

128

100

080

from H/L=3

70

75

80

85

90

0 10 20 30 40 50 60

SP

L, P

Ld

B

f, deg

200

160

128

100

080

from H/L=5

Mixed Tetra

Loudness : Extracted position

70

75

80

85

90

0 10 20 30 40 50 60

SP

L,

PL

dB

f, deg

from H/L=1

from H/L=3

from H/L=5

70

75

80

85

90

0 10 20 30 40 50 60

SP

L,

PL

dB

f, deg

from H/L=1

from H/L=3

from H/L=5

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP, P

a

X(m)

H/L=1

H/L=3

H/L=5

f=0deg

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP, P

a

X(m)

H/L=1

H/L=3

H/L=5

f=0deg

Coarse mesh (200) Fine mesh (100)Loudness Loudness

Ground signature Ground signature

Model Providor viscousity meshmixed 2.56 2 1.6 1.28 1

tetrahedra 2.56 2 1.6 1.28 1jwb SBPW inviscid tetrahedra 1 0.83 0.7

mixed 2 1.6 1.28 1 0.8 0.64tetrahedra 2 1.6 1.28 1 0.8


axie SBPW inviscid

c25d-flowthru SBPW inviscid

Multi-pole + Burgers

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP, P

a

X(m)

H/L=1

H/L=3

H/L=5

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150D

P, P

aX(m)

H/L=0.85

H/L=2.55

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150D

P, P

a

X(m)

H/L=1

H/L=3

H/L=5

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP, P

a

X(m)

H/L=1

H/L=3

H/L=5

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP, P

a

X(m)

H/L=0.85

H/L=2.55

Ground signature

AXIE

Multi pole & Burgers

Burgers only

C25D JWBBurgers only Burgers only

Multi pole & Burgers

BergersMultiPole+Bergers

70

75

80

85

90

0 1 2 3 4 5 6

SP

L, P

Ld

B

H/L

Bergers

70

75

80

85

90

0 1 2 3 4 5 6

SP

L, P

Ld

B

H/L

Bergers

MultiPole+Bergers

70

75

80

85

90

0 1 2 3 4 5 6

SP

L, P

Ld

B

H/L

Bergers

MultiPole+Bergers

MP+B, H/L=5

B, H/L=0.85B,H/L=2.55MP+B, H/L=0.85MP+B,H/L=2.55

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150D

P, P

a

X(m)

B, H/L=1

B, H/L=3

B, H/L=5

MP+B, H/L=1

MP+B, H/L=3

MP+B, H/L=5

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP, P

a

X(m)

B, H/L=1

B, H/L=3

B, H/L=5

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150

DP, P

a

X(m)

B, H/L=0.85

B,H/L=2.55

MP+B, H/L=0.85

MP+B,H/L=2.55

Multi-Pole & Burgers

AXIE

Loudness Loudness

Ground signature

C25D JWBGround signature Ground signature

Loudness

AXIE vs C25D vs JWB

70

75

80

85

90

0 10 20 30 40 50 60

SP

L, P

Ld

B

f, deg

AXIEC25D-flo.JWB

-20

-15

-10

-5

0

5

10

15

20

-50 0 50 100 150 200

DP, P

a

Time, msec

AXIE

C25D-flo.

JWB

All Models

-0.006

-0.004

-0.002

0

0.002

0.004

0.006

120 130 140 150 160 170

DP

/Pin

f

X(m)

AXIE

C25D-flo.

JWB

Near Field (H/L=3 of C25D)

Ground Signature (f=0deg)

Loudness

Viscosity : inviscid

Mesh : Tetra

Resolution

AXIE : 100

C25D : 080

JWB : 070

Near field, Z= -99m

AXIE : H/L=3

C25D : H/L=3

JWB : H/L=2.55

f=0 10 2030

4050deg

Conclusion

• Analyzed cases

- AXIE, JWB, C25D(flow-thorough)

• Limiter function

Limiter function is related to sharpness of near field pressure signature.

Venkatakrishunan limiter : limiter factor；K=1.0, 0.1, 0.01, 0.001

K=0.01 – 1 are almost same results.

Limiter factor(K) is changed if unexpected oscillation is observed.

• Mesh type

Mixed and Tetra has similar characteristics.

•Mesh resolution

AXIE: 100-160 are almost same.

JWB : 070-100 are almost sane.

C25D : 064-100 are almost same.

• 3 models

It is found that JWB has similar to the low-boom effect of the C25D.

Documents

Near-field Pressure Signature Prediction by JAXA...Near-field Pressure Signature Prediction by JAXA Hiroaki ISHIKAWA (ASIRI) Yoshikazu MAKINO (JAXA) Atsushi UENO (JAXA) Yohei KASUGA