Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
1/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Organization (S):
EDF/EP/AMV
Manual of Validation
V8.22 booklet: Harmonic accoustics
Document: V8.22.100
AHLV100 - Guide wave at anechoic exit
Summary:
A rectilinear guide of wave at anechoic exit, with rigid walls, whose propagation medium is air
“normal”, is excited by a harmonically vibrating piston.
One calculates by an acoustic formulation the acoustic field of pressure of the harmonic response for 13
different modelings. The results are tested in 2 points at the entry and 2 points at the exit.
They make it possible to validate the matrices of rigidity, mass, damping (impedance), the vector source
(imposed normal speed) as well as the operators of postprocessings.
The results of reference come from an analytical calculation.
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
2/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
1
Problem of reference
1.1 Geometry
D
exit
anechoic
X
C
surface side rigid
y
wave
plane
O
With
Z
B
Tube with rectangular section:
length:
L = L
X
= 1.0 m
height:
H = L
y
= 0.1 m
width:
L = L
Z
= 0.2 m
Co-ordinates of the points (in m):
With
B
C
D
X
0.
0.
1.00
1.00
y
0.
0.05
0.
0.05
Z
0.20
0.10
0.20
0.10
1.2
Properties of materials
Air:
O
= 1.3 kg. m
3
C
O
= 343. Mr. S
1
1.3
Boundary conditions and loading
Normal speed at the entry
V = V
N
* exp (I
T) with V
N
= 0.014 Mr. S
1
F = 500 Hz
Impedance at the end CD
Z =
O
.
C
O
= 445.9 Kg.m
2
S
1
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
3/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
2
Reference solution
2.1
Method of calculation used for the reference solution
The general analytical solution for a guide of wave is written:
(
)
E, E, E
X
y
Z
being the orthonormé reference mark associated the Cartesian co-ordinates
(
)
X y Z
,
·
for the pressure:
(
)
()
(
)
p X y Z
With
ikx
B
ikx
,
exp
exp
=
+
-
·
for vibratory speed:
(
)
()
(
)
[
]
V
E
X y Z
C
With
ikx
B
ikx
X
,
.
exp
exp
= -
-
-
1
0
0
·
With and B are determined by the boundary conditions:
(
)
(
)
(
)
(
)
in X
0
in X
L
and
with
=
=
=
=
=
-
+
-
=
-
+
-
-
=
V
V
p L y Z
Z
L y Z
With
B Z
C
Z
C
ikL
B
C V
Z
C
Z
C
ikL
C
N
N
L
N
K
0
0
0
0
0
0
0
0
0
0
0
0
2
2
1
,
.
.
.
.
exp
.
.
.
.
exp
V
N
In the studied case, the exit of the guide is anechoic:
Z
C
=
0 0
. One thus has:
·
for the pressure:
(
)
(
)
p X y Z
C V
ikx
N
,
exp
=
-
0 0
·
for speed:
(
)
(
)
V
E
X y Z
V
ikx
N
X
,
exp
.
= -
-
·
and for the acoustic intensity:
I
V
E
=
=
1
2
1
2
0 0
2
p
C V
N
X
*
.
i.e. acoustic Intensité activates uniform in all the guide and parallel with the axis.
The Eigen frequencies are given for the guide closed at the two ends by:
F
C
m
N
p
m N p
X
y
Z
,
/
=
+
+
0
2
2
2
2
2
2
1 2
2
1
1
1
where
m N p
,
are entireties
0
2.2
Results of reference
Pressure at the points A, B, C, D (for modelings A, B, C, D, E).
Acoustic intensity at points A, B, C, D (for modelings A and C).
Eigen frequencies n°2 with n°9.
2.3
Uncertainty on the solution
Analytical solution
2.4 References
bibliographical
[1]
BOUIZI A. Résolution of the equations of linear accoustics by a method finite elements
mixed - Thesis (1989).
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
4/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
3 Modeling
With
3.1
Characteristics of modeling
Formulation pressure elements
3D
“ACOUSTIC”
(
ACOU_HEXA20
and
ACOU_FACE8
)
vis-a-vis impedance
imposed
vis-a-vis speed
imposed normal
Z
X
C
With
B
D
y
Cutting =
15
meshs HEXA20 according to the x axis
2
meshs HEXA20 according to the y axis
2
meshs HEXA20 according to the axis of Z
Limiting conditions:
VITE_FACE:
(Group_ma: Input
Vnor: IH 0.014 0.)
IMPE_FACE:
(Group_ma: Exit
Impe: IH 445.9 0.)
Name of the nodes
With = No1
B = No780
C = No751
D = No763
3.2
Characteristics of the mesh
A number of nodes:
471
A number of meshs and types:
60
HEXA20
8
QUAD8
3.3 Functionalities
tested
Controls
Keys
AFFE_MODELE
“ACOUSTIC”
“3D”
ALL
[U4.22.01]
DEFI_MATERIAU
FLUID
RHO
[U4.23.01]
CELE_C
AFFE_CHAR_ACOU
MODEL
[U4.25.03]
VITE_FACE
VNOR
GROUP_MA
IMPE_FACE
IMPE
CALC_MATR_ELEM
“RIGI_ACOU”
MODEL
[U4.41.01]
“MASS_ACOU”
CHAM_MATER
“AMOR_ACOU”
CHARGE
COMB_MATR_ASSE
COMB_R
PART
REALITY
[U4.53.01]
IMAG
MODE_ITER_SIMULT
“TAPE”
[U4.52.01]
CALC_VECT_ELEM
“CHAR_ACOU”
MODEL
[U4.41.02]
CHAM_MATER
CHARGE
DYNA_LINE_HARM
[U4.54.01]
CALC_ELEM
“PRES_ELNO_REEL”
NEAR
[U4.61.02]
“PRES_ELNO_IMAG”
CHAM_MATER
“INTE_ELNO_ACTI”
FREQ
“INTE_ELNO_REAC”
CALC_CHAM_ELEM
“PRES_ELNO_DBEL”
NEAR
“PRES_ELNO_REEL”
CHAM_MATER
“PRES_ELNO_IMAG”
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
5/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
4
Results of modeling A
4.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real)
6.2426
6.2425
0.001
p (imag)
0.0000
0.0003
-
Intensité_Acou
0.0437
0.0450
2.97
B
p (real)
6.2426
6.2425
0.001
p (imag)
0.0000
0.0003
-
Intensité_Acou
0.0437
0.0450
2.97
C
p (real)
6.0237
6.0222
0.02
p (imag)
1.6387
1.6441
0.33
Intensité_Acou
0.04037
0.0450
2.97
D
p (real)
6.0237
6.0222
0.02
p (imag)
1.6387
1.6441
0.33
Intensité_Acou
0.0437
0.0450
2.97
Frequency (Hz)
Command of the clean mode I
m
N
p
Reference
Aster
% difference
2
3
4
5
6
7
8
9
1
2
3
4
5
0
1
2
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
171.5
343.0
514.5
686.0
857.5
857.5
874.482
923.556
171.500
343.007
514.555
686.226
858.178
860.719
877.640
926.568
+0.0001
+0.002
+0.01
+0.03
+0.08
+0.4
+0.4
+0.3
4.2 Remarks
Calculations of modes carried out by:
MODE_ITER_SIMULT
OPTION: “TAPE” FREQ: (0. 300. )
4.3 Parameters
of execution
Version: 3.05
Machine: CRAY C90
System:
UNICOS 8.0
Overall dimension memory:
8 megawords
Time CPU To use:
2.6 seconds
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
6/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
5 Modeling
B
5.1
Characteristics of modeling
Formulation pressure potential of elements displacements
'3d_FLUIDE
'(
MEFL_HEXA20
and
MEFL_FACE8
)
vis-a-vis
impedance
imposed
vis-a-vis speed
normal
imposed
Z
X
C
With
B
D
y
Cutting =
15
meshs HEXA20 according to the x axis
2
meshs HEXA20 according to the y axis
2
meshs HEXA20 according to the axis of Z
Limiting conditions:
VITE_FACE:
(GROUP_MA: Input
VNOR: 0.014)
IMPE_FACE:
(GROUP_MA: Exit
IMPE: 445.9)
Name of the nodes
With = No1
B = No780
C = No751
D = No763
5.2
Characteristics of the mesh
A number of nodes:
471
A number of meshs and types:
60
HEXA20
8
QUAD8
5.3 Functionalities
tested
Controls
Keys
AFFE_MODELE
“MECHANICAL”
“3d_FLUIDE”
GROUP_MA
[U4.22.01]
DEFI_MATERIAU
FLUID
RHO
[U4.23.01]
CELE_R
AFFE_CHAR_MECA
VITE_FACE
VNOR
GROUP_MA
[U4.25.01]
IMPE_FACE
IMPE
CALC_MATR_ELEM
“RIGI_MECA”
MODEL
[U4.41.01]
“MASS_MECA”
CHAM_MATER
“IMPE_MECA”
CHARGE
CALC_VECT_ELEM
“CHAR_MECA”
MODEL
[U4.41.02]
CHAM_MATER
CHARGE
DYNA_LINE_HARM
[U4.54.02]
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
7/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
6
Results of modeling B
6.1 Values
tested
Localization
Reference
Reference
Aster
% difference
With
p (real)
p (imag)
6.2426
0.0
6.2425
0.0003
0.001
-
B
p (real)
p (imag)
6.2426
0.0
6.2425
0.0003
0.001
-
C
p (real)
p (imag)
6.0237
1.6387
6.0222
1.6444
0.02
0.34
D
p (real)
p (imag)
6.0237
1.6387
6.0222
1.6444
0.02
0.34
6.2 Parameters
of execution
Version: 3.05
Machine: CRAY C90
System:
UNICOS 8.0
Overall dimension memory:
8 megawords
Time CPU To use:
5.7 seconds
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
8/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
7 Modeling
D
7.1
Characteristics of modeling
Formulation pressure potential of elements displacements '
2D
_
FLUIDE'
(
MEFLSE3
and
MEFLQU8
)
vis-a-vis
impedance
imposed
vis-a-vis speed
imposed normal
X
C
With
B
D
y
Cutting =
15
meshs QUAD8 according to the x axis
2
meshs QUAD8 according to the y axis
Limiting conditions:
VITE_FACE:
(GROUP_MA: Input
VNOR: 0.014)
IMPE_FACE:
(GROUP_MA: Exit
IMPE: 445.9)
Name of the nodes
With = No1
B = No780
C = No151
D = No153
7.2
Characteristics of the mesh
A number of nodes:
125
A number of meshs and types:
30
QUAD8
4
SEG3
7.3 Functionalities
tested
Controls
Keys
AFFE_MODELE
“MECHANICAL”
“2d_FLUIDE”
GROUP_MA
[U4.22.01]
DEFI_MATERIAU
FLUID
RHO
[U4.23.01]
CELE_R
AFFE_CHAR_MECA
VITE_FACE
VNOR
GROUP_MA
[U4.25.01]
IMPE_FACE
IMPE
CALC_MATR_ELEM
“RIGI_MECA”
MODEL
[U4.41.01]
“MASS_MECA”
CHAM_MATER
“IMPE_MECA”
CHARGE
CALC_VECT_ELEM
“CHAR_MECA”
MODEL
[U4.41.02]
CHAM_MATER
CHARGE
DYNA_LINE_HARM
[U4.54.02]
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
9/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
8
Results of modeling D
8.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real)
p (imag)
6.2426
0.0
6.2425
0.0003
0.001
-
B
p (real)
p (imag)
6.2426
0.0
6.2425
0.0003
0.001
-
C
p (real)
p (imag)
6.0237
1.6387
6.0222
1.6441
0.02
0.37
D
p (real)
p (imag)
6.0237
1.6387
6.0222
1.6441
0.02
0.37
8.2 Parameters
of execution
Version: 3.00
Machine: CRAY C90
System:
UNICOS 8.0
Overall dimension memory:
8 megawords
Time CPU To use:
2.8 seconds
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
10/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
9 Modeling
E
9.1
Characteristics of modeling
Formulation pressure potential of elements displacements
“AXIS_FLUIDE”
(
MEAXFLS3
and
MEAXFLQ8
)
vis-a-vis speed
imposed normal
X
C
With
B
D
vis-a-vis impedance
imposed
y
Cutting =
15
meshs QUAD8 according to the x axis
2
meshs QUAD8 according to the y axis
Limiting conditions:
VITE_FACE:
(GROUP_MA: Input
VNOR: 0.014)
IMPE_FACE:
(GROUP_MA: Exit
IMPE: 445.9)
Name of the nodes
With = No1
B = No780
C = No151
D = No153
9.2
Characteristics of the mesh
A number of nodes:
125
A number of meshs and types:
30
QUAD8
4
SEG3
9.3 Functionalities
tested
Controls
Keys
AFFE_MODELE
“MECHANICAL”
“AXIS_FLUIDE”
GROUP_MA
[U4.22.01]
DEFI_MATERIAU
FLUID
RHO
[U4.23.01]
CELE_R
AFFE_CHAR_MECA
VITE_FACE
VNOR
GROUP_MA
[U4.25.01]
IMPE_FACE
IMPE
CALC_MATR_ELEM
“RIGI_MECA”
MODEL
[U4.41.01]
“MASS_MECA”
CHAM_MATER
“IMPE_MECA”
CHARGE
CALC_VECT_ELEM
“CHAR_MECA”
MODEL
[U4.41.02]
CHAM_MATER
CHARGE
DYNA_LINE_HARM
[U4.54.02]
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
11/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
10
Results of modeling E
10.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real)
p (imag)
6.2426
0.0
6.2425
0.0003
0.001
-
B
p (real)
p (imag)
6.2426
0.0
6.2425
0.0003
0.001
-
C
p (real)
p (imag)
6.0237
1.6387
6.0222
1.6441
0.02
0.37
D
p (real)
p (imag)
6.0237
1.6387
6.0222
1.6441
0.02
0.37
10.2 Parameters
of execution
Version: 3.02
Machine: CRAY C90
System:
UNICOS 8.0
Overall dimension memory:
8 megawords
Time CPU To use:
4.1 seconds
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
12/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
11 Modeling
F
11.1 Characteristics of modeling
Formulation pressure elements
PLAN
“ACOUSTIC”
(
SEG3
AND
QUAD8
)
vis-a-vis
impedance
imposed
vis-a-vis speed
imposed normal
X
C
With
B
D
y
Cutting =
15
meshs QUAD8 according to the x axis
2
meshs QUAD8 according to the y axis
Limiting conditions:
VITE_FACE:
(Group_ma: Input
Vnor: 0.014)
IMPE_FACE:
(Group_ma: Exit
Impe: 445.9)
Name of the nodes
With = No1
B = No33
C = No2
D = No34
11.2 Characteristics of the mesh
A number of nodes:
125
A number of meshs and types:
30
QUAD8
4
SEG3
11.3 Functionalities
tested
Controls
Keys
AFFE_MODELE
“ACOUSTIC”
“PLANE”
GROUP_MA
[U4.22.01]
DEFI_MATERIAU
FLUID
RHO
CELE_R
[U4.23.01]
AFFE_CHAR_MECA
VITE_FACE
IMPE_FACE
VNOR
IMPE
GROUP_MA
[U4.25.01]
CALC_MATR_ELEM
“RIGI_MECA”
“MASS_MECA”
“IMPE_MECA”
MODEL
CHAM_MATER
CHARGE
[U4.41.01]
CALC_VECT_ELEM
“CHAR_MECA”
MODEL
CHAM_MATER
CHARGE
[U4.41.02]
DYNA_LINE_HARM
[U4.54.02]
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
13/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
12
Results of modeling F
12.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real, imag)
( 6.2426, 0.0)
( 6.2425, 0.0003)
0.005
B
p (real, imag)
( 6.2426, 0.0)
( 6.2425, 0.0003)
0.005
C
p (real, imag)
(6.0237, 1.6387)
(6.0222, 1.6441)
0.089
D
p (real, imag)
(6.0237, 1.6387)
(6.0222, 1.6441)
0.089
12.2 Parameters
of execution
Version: 3.07
Machine: CRAY C90
System:
UNICOS 80.
Overall dimension memory:
8 megawords
Time CPU To use:
3.8 seconds
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
14/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
13 Modeling
G
13.1 Characteristics of modeling
Formulation pressure elements
3D
“ACOUSTIC”
(
ACOU_HEXA8
and
ACOU_FACE4
)
Cutting =
30
meshs HEXA8 according to the x axis
4
meshs HEXA8 according to the y axis
4
meshs HEXA8 according to the axis of Z
Limiting conditions:
VITE_FACE:
(Group_ma: bicycle
Vnor: IH 0.014 0.)
IMPE_FACE:
(Group_ma: impe
Impe: IH 445.9 0.)
Name of the nodes
With = No69
B = No95
C = No65
D = No876
13.2 Characteristics of the mesh
A number of nodes:
775
A number of meshs and types:
480
HEXA8
32
QUAD4
13.3 Functionalities
tested
Controls
Keys
AFFE_MODELE
“ACOUSTIC”
“3D”
ALL
[U4.22.01]
DEFI_MATERIAU
FLUID
RHO
CELE_C
[U4.23.01]
AFFE_CHAR_ACOU
MODEL
VITE_FACE
IMPE_FACE
VNOR
IMPE
GROUP_MA
[U4.25.03]
CALC_MATR_ELEM
“RIGI_ACOU”
“MASS_ACOU”
“AMOR_ACOU”
MODEL
CHAM_MATER
CHARGE
[U4.41.01]
CALC_VECT_ELEM
“CHAR_ACOU”
MODEL
CHAM_MATER
CHARGE
[U4.41.02]
CALC_ELEM
“PRES_ELNO_REEL”
“PRES_ELNO_IMAG”
“INTE_ELNO_ACTI”
“INTE_ELNO_REAC”
NEAR
CHAM_MATER
FREQ
[U4.61.02]
CALC_CHAM_ELEM
“PRES_ELNO_DBEL”
“PRES_ELNO_REEL”
“PRES_ELNO_IMAG”
NEAR
CHAM_MATER
MODE_ITER_SIMULT
“TAPE”
[U4.52.01]
DYNA_LINE_HARM
[U4.54.01]
COMB_MATR_ASSE
COMB_R
PART
REALITY
IMAG
[U4.53.01]
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
15/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
14
Results of modeling G
14.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real, imag)
Intensité_Acou
( 6.2426, 0.0000)
0.0437
( 6.2469, 0.0137)
0.0431
0.231
- 1.47
B
p (real, imag)
Intensité_Acou
( 6.2426, 0.0000)
0.0437
( 6.2469, 0.0137)
0.0431
0.231
- 1.47
C
p (real, imag)
Intensité_Acou
(6.0237, 1.6387)
0.0437
(5.9663, 1.8438)
0.0431
3.411
- 1.47
D
p (real, imag)
Intensité_Acou
(6.0237, 1.6387)
0.0437
(5.9663, 1.8438)
0.0431
3.411
- 1.47
Frequency (Hz)
Command of the clean mode I
m
N
p
Reference
Aster
% difference
2
3
4
5
6
7
8
9
1
2
3
4
5
0
1
2
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
171.5
343.0
514.5
686.0
857.5
857.5
874.482
923.556
171.578
343.627
516.618
691.026
867.326
879.674
896.251
944.408
0.046
0.183
0.412
0.733
1.146
2.586
2.489
2.258
14.2 Remarks
Calculations of modes carried out by:
MODE_ITER_SIMULT
option: “tape” List_freq: (0. 1000. )
14.3 Parameters
of execution
Version: 3.07
Machine: CRAY C90
System:
UNICOS 80.
Overall dimension memory:
8 megawords
Time CPU To use:
8.9 seconds
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
16/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
15 Modeling
H
15.1 Characteristics of modeling
Formulation pressure elements
3D
“ACOUSTIC”
(
ACOU_PENTA15
and
ACOU_FACE6
)
Cutting =
15
meshs PENTA15 according to the x axis
2
meshs PENTA15 according to the y axis
2
meshs PENTA15 according to the axis of Z
Limiting conditions:
VITE_FACE:
(Group_ma: bicycle
Vnor: IH 0.014 0.)
IMPE_FACE:
(Group_ma: impe
Impe: IH 445.9 0.)
Name of the nodes
With = No28
B = No64
C = No24
D = No720
15.2 Characteristics of the mesh
A number of nodes:
456
A number of meshs and types:
90 PENTA15 12
TRIA6
15.3 Functionalities
tested
Controls
Keys
AFFE_MODELE
“ACOUSTIC”
“3D”
ALL
[U4.22.01]
DEFI_MATERIAU
FLUID
RHO
CELE_C
[U4.23.01]
AFFE_CHAR_ACOU
MODEL
VITE_FACE
IMPE_FACE
VNOR
IMPE
GROUP_MA
[U4.25.03]
CALC_MATR_ELEM
“RIGI_ACOU”
“MASS_ACOU”
“AMOR_ACOU”
MODEL
CHAM_MATER
CHARGE
[U4.41.01]
CALC_VECT_ELEM
“CHAR_ACOU”
MODEL
CHAM_MATER
CHARGE
[U4.41.02]
CALC_ELEM
“PRES_ELNO_REEL”
“PRES_ELNO_IMAG”
“INTE_ELNO_ACTI”
“INTE_ELNO_REAC”
NEAR
CHAM_MATER
FREQ
[U4.61.02]
CALC_CHAM_ELEM
“PRES_ELNO_DBEL”
“PRES_ELNO_REEL”
“PRES_ELNO_IMAG”
NEAR
CHAM_MATER
MODE_ITER_SIMULT
“TAPE”
[U4.52.01]
DYNA_LINE_HARM
[U4.54.01]
COMB_MATR_ASSE
COMB_R
PART
REALITY
IMAG
[U4.53.01]
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
17/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
16
Results of modeling C
16.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real, imag)
Intensité_Acou
( 6.2426, 0.0000)
0.0437
( 6.2425-, 0.0003)
0.0450
0.005
2.97
B
p (real, imag)
Intensité_Acou
( 6.2426, 0.0000)
0.0437
( 6.2425, 0.0003)
0.0450
0.005
2.97
C
p (real, imag)
Intensité_Acou
(6.0237, 1.6387)
0.0437
(6.0222, 1.6441)
0.0450
0.089
2.97
D
p (real, imag)
Intensité_Acou
(6.0237, 1.6387)
0.0437
(6.0222, 1.6441)
0.0450
0.089
2.97
Frequency (Hz)
Command of the clean mode I
m
N
p
Reference
Aster
% difference
2
3
4
5
6
7
8
9
1
2
3
4
5
0
1
2
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
171.5
343.0
514.5
686.0
857.5
857.5
874.482
923.556
171.500
343.007
514.555
686.226
858.178
860.470
877.395
926.335
0.000
0.002
0.011
0.033
0.079
0.346
0.333
0.301
16.2 Remarks
Calculations of modes carried out by:
MODE_ITER_SIMULT
option: “tape” List_freq: (0. 1000. )
16.3 Parameters
of execution
Version: 3.07
Machine: CRAY C90
System:
UNICOS 80.
Overall dimension memory:
8 megawords
Time CPU To use:
7.0 seconds
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
18/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
17 Modeling
I
17.1 Characteristics of modeling
Formulation pressure elements
3D
“ACOUSTIC”
(
ACOU_PENTA6
and
ACOU_FACE3
)
Cutting =
30
meshs PENTA6 according to the x axis
4
meshs PENTA6 according to the y axis
4
meshs PENTA6 according to the axis of Z
Limiting conditions:
VITE_FACE:
(Group_ma: bicycle
Vnor: IH 0.014 0.)
IMPE_FACE:
(Group_ma: impe
Impe: IH 445.9 0.)
Name of the nodes
With = No110
B = No156
C = No106
D = No939
17.2 Characteristics of the mesh
A number of nodes:
775
A number of meshs and types:
960 PENTA6 64
TRIA3
17.3 Functionalities
tested
Controls
Keys
AFFE_MODELE
“ACOUSTIC”
“3D”
ALL
[U4.22.01]
DEFI_MATERIAU
FLUID
RHO
CELE_C
[U4.23.01]
AFFE_CHAR_ACOU
MODEL
VITE_FACE
IMPE_FACE
VNOR
IMPE
GROUP_MA
[U4.25.03]
CALC_MATR_ELEM
“RIGI_ACOU”
“MASS_ACOU”
“AMOR_ACOU”
MODEL
CHAM_MATER
CHARGE
[U4.41.01]
CALC_VECT_ELEM
“CHAR_ACOU”
MODEL
CHAM_MATER
CHARGE
[U4.41.02]
CALC_ELEM
“PRES_ELNO_REEL”
“PRES_ELNO_IMAG”
“INTE_ELNO_ACTI”
“INTE_ELNO_REAC”
NEAR
CHAM_MATER
FREQ
[U4.61.02]
CALC_CHAM_ELEM
“PRES_ELNO_DBEL”
“PRES_ELNO_REEL”
“PRES_ELNO_IMAG”
NEAR
CHAM_MATER
MODE_ITER_SIMULT
“TAPE”
[U4.52.01]
DYNA_LINE_HARM
[U4.54.01]
COMB_MATR_ASSE
COMB_R
PART
REALITY
IMAG
[U4.53.01]
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
19/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
18
Results of modeling I
18.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real, imag)
Intensité_Acou
( 6.2426, 0.0000)
0.0437
( 6.2469-, 0.0138)
0.0431
0.231
- 1.47
B
p (real, imag)
Intensité_Acou
( 6.2426, 0.0000)
0.0437
( 6.2469, 0.0138)
0.0431
0.231
- 1.47
C
p (real, imag)
Intensité_Acou
(6.0237, 1.6387)
0.0437
(5.9663, 1.8438)
0.0431
3.411
- 1.47
D
p (real, imag)
Intensité_Acou
(6.0237, 1.6387)
0.0437
(5.9663, 1.8438)
0.0431
3.411
- 1.47
Frequency (Hz)
Command of the clean mode I
m
N
p
Reference
Aster
% difference
2
3
4
5
6
7
8
9
1
2
3
4
5
0
1
2
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
171.5
343.0
514.5
686.0
857.5
857.5
874.482
923.556
171.578
343.627
516.618
691.026
867.326
879.045
895.633
943.821
0.046
0.183
0.412
0.733
1.146
2.512
2.419
2.194
18.2 Remarks
Calculations of modes carried out by:
MODE_ITER_SIMULT
option: “tape” List_freq: (0. 1000. )
18.3 Parameters
of execution
Version: 3.07
Machine: CRAY C90
System:
UNICOS 80.
Overall dimension memory:
8 megawords
Time CPU To use:
9.7 seconds
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
20/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
19 Modeling
J
19.1 Characteristics of modeling
Formulation pressure elements
3D
“ACOUSTIC”
(
ACOU_TETRA10
and
ACOU_FACE6
)
Cutting =
15
meshs TETRA10 according to the x axis
2
meshs TETRA10 according to the y axis
2
meshs TETRA10 according to the axis of Z
Limiting conditions:
VITE_FACE:
(Group_ma: bicycle
Vnor: IH 0.014 0.)
IMPE_FACE:
(Group_ma: impe
Impe: IH 445.9 0.)
Name of the nodes
With = No4
B = No76
C = No7
D = No73
19.2 Characteristics of the mesh
A number of nodes:
870
A number of meshs and types:
421 TETRA10 16
TRIA6
19.3 Functionalities
tested
Controls
Keys
AFFE_MODELE
“ACOUSTIC”
“3D”
ALL
[U4.22.01]
DEFI_MATERIAU
FLUID
RHO
CELE_C
[U4.23.01]
AFFE_CHAR_ACOU
MODEL
VITE_FACE
IMPE_FACE
VNOR
IMPE
GROUP_MA
[U4.25.03]
CALC_MATR_ELEM
“RIGI_ACOU”
“MASS_ACOU”
“AMOR_ACOU”
MODEL
CHAM_MATER
CHARGE
[U4.41.01]
CALC_VECT_ELEM
“CHAR_ACOU”
MODEL
CHAM_MATER
CHARGE
[U4.41.02]
CALC_ELEM
“PRES_ELNO_REEL”
“PRES_ELNO_IMAG”
“INTE_ELNO_ACTI”
“INTE_ELNO_REAC”
NEAR
CHAM_MATER
FREQ
[U4.61.02]
CALC_CHAM_ELEM
“PRES_ELNO_DBEL”
“PRES_ELNO_REEL”
“PRES_ELNO_IMAG”
NEAR
CHAM_MATER
MODE_ITER_SIMULT
“TAPE”
[U4.52.01]
DYNA_LINE_HARM
[U4.54.01]
COMB_MATR_ASSE
COMB_R
PART
REALITY
IMAG
[U4.53.01]
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
21/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
20
Results of modeling J
20.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real, imag)
Intensité_Acou
( 6.2426, 0.0000)
0.0437
( 6.2483-, - 0.0162)
0.0447
0.272
2.398
B
p (real, imag)
Intensité_Acou
( 6.2426, 0.0000)
0.0437
( 6.2465, - 0.0122)
0.0452
0.205
3.507
C
p (real, imag)
Intensité_Acou
(6.0237, 1.6387)
0.0437
(6.0201, 1.6491)
0.0443
0.176
1.283
D
p (real, imag)
Intensité_Acou
(6.0237, 1.6387)
0.0437
(6.0284, 1.6319)
0.0449
0.133
2.797
Frequency (Hz)
Command of the clean mode I
m
N
p
Reference
Aster
% difference
2
3
4
5
6
7
8
9
1
2
3
4
5
0
1
2
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
171.5
343.0
514.5
686.0
857.5
857.5
874.482
923.556
171.500
343.005
514.534
686.146
857.924
860.111
877.250
927.079
0.000
0.001
0.007
0.021
0.049
0.304
0.317
0.381
20.2 Remarks
Calculations of modes carried out by:
MODE_ITER_SIMULT
option: “tape” List_freq: (0. 1000. )
20.3 Parameters
of execution
Version: 3.07
Machine: CRAY C90
System:
UNICOS 80.
Overall dimension memory:
8 megawords
Time CPU To use:
9.5 seconds
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
22/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
21 Modeling
K
21.1 Characteristics of modeling
Formulation pressure elements
3D
“ACOUSTIC”
(
ACOU_TETRA4
and
ACOU_FACE3
)
Cutting =
30
meshs TETRA4 according to the x axis
4
meshs TETRA4 according to the y axis
4
meshs TETRA4 according to the axis of Z
Limiting conditions:
VITE_FACE:
(Group_ma: bicycle
Vnor: IH 0.014 0.)
IMPE_FACE:
(Group_ma: impe
Impe: IH 445.9 0.)
Name of the nodes
With = No18
B = No521
C = No15
D = No1028
21.2 Characteristics of the mesh
A number of nodes:
685
A number of meshs and types:
2180 TETRA4 64
TRIA6
21.3 Functionalities
tested
Controls
Keys
AFFE_MODELE
“ACOUSTIC”
“3D”
ALL
[U4.22.01]
DEFI_MATERIAU
FLUID
RHO
CELE_C
[U4.23.01]
AFFE_CHAR_ACOU
MODEL
VITE_FACE
IMPE_FACE
VNOR
IMPE
GROUP_MA
[U4.25.03]
CALC_MATR_ELEM
“RIGI_ACOU”
“MASS_ACOU”
“AMOR_ACOU”
MODEL
CHAM_MATER
CHARGE
[U4.41.01]
CALC_VECT_ELEM
“CHAR_ACOU”
MODEL
CHAM_MATER
CHARGE
[U4.41.02]
CALC_ELEM
“PRES_ELNO_REEL”
“PRES_ELNO_IMAG”
“INTE_ELNO_ACTI”
“INTE_ELNO_REAC”
NEAR
CHAM_MATER
FREQ
[U4.61.02]
CALC_CHAM_ELEM
“PRES_ELNO_DBEL”
“PRES_ELNO_REEL”
“PRES_ELNO_IMAG”
NEAR
CHAM_MATER
MODE_ITER_SIMULT
“TAPE”
[U4.52.01]
DYNA_LINE_HARM
[U4.54.01]
COMB_MATR_ASSE
COMB_R
PART
REALITY
IMAG
[U4.53.01]
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
23/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
22
Results of modeling K
22.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real, imag)
Intensité_Acou
( 6.2426, 0.0000)
0.0437
( 6.2321, 0.0342)
0.0431
0.574
- 1.439
B
p (real, imag)
Intensité_Acou
( 6.2426, 0.0000)
0.0437
( 6.1797, 0.0300)
0.0427
1.116
- 2.274
C
p (real, imag)
Intensité_Acou
(6.0237, 1.6387)
0.0437
(5.8478, 1.8750)
0.0421
4.719
- 3.571
D
p (real, imag)
Intensité_Acou
(6.0237, 1.6387)
0.0437
(5.9706, 1.9224)
0.0427
4.623
- 2.212
Frequency (Hz)
Command of the clean mode I
m
N
p
Reference
Aster
% difference
2
3
4
5
6
7
8
9
1
2
3
4
5
0
1
2
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
171.5
343.0
514.5
686.0
857.5
857.5
874.482
923.556
171.689
343.870
517.434
692.615
870.670
876.335
896.171
953.782
0.110
0.254
0.570
0.964
1.536
2.196
2.480
3.273
22.2 Remarks
Calculations of modes carried out by:
MODE_ITER_SIMULT
option: “tape” List_freq: (0. 1000. )
22.3 Parameters
of execution
Version: 3.07
Machine: CRAY C90
System:
UNICOS 80.
Overall dimension memory:
8 megawords
Time CPU To use:
11.7 seconds
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
24/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
23 Modeling
Q
23.1 Characteristics of modeling
Formulation pressure elements
PLAN
“ACOUSTIC”
(
SEG2
AND
QUAD4
)
Cutting =
30
meshs QUAD4 according to the x axis
4
meshs QUAD4 according to the y axis
Limiting conditions:
VITE_FACE:
(Group_ma: Input
Vnor: 0.014)
IMPE_FACE:
(Group_ma: Exit
Impe: 445.9)
Name of the nodes
With = No1
B = No237
C = No2
D = No205
23.2 Characteristics of the mesh
A number of nodes:
155
A number of meshs and types:
120
QUAD8
8
SEG2
23.3 Functionalities
tested
Controls
Keys
AFFE_MODELE
“ACOUSTIC”
“PLANE”
GROUP_MA
[U4.22.01]
DEFI_MATERIAU
FLUID
RHO
CELE_R
[U4.23.01]
AFFE_CHAR_MECA
VITE_FACE
IMPE_FACE
VNOR
IMPE
GROUP_MA
[U4.25.01]
CALC_MATR_ELEM
“RIGI_MECA”
“MASS_MECA”
“IMPE_MECA”
MODEL
CHAM_MATER
CHARGE
[U4.41.01]
CALC_VECT_ELEM
“CHAR_MECA”
MODEL
CHAM_MATER
CHARGE
[U4.41.02]
DYNA_LINE_HARM
[U4.54.02]
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
25/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
24
Results of modeling Q
24.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real, imag)
( 6.2426, 0.0)
( 6.2469, 0.0138)
0.231
B
p (real, imag)
( 6.2426, 0.0)
( 6.2469, 0.0138)
0.231
C
p (real, imag)
(6.0237, 1.6387)
(5.9663, 1.8438)
3.411
D
p (real, imag)
(6.0237, 1.6387)
(5.9663, 1.8438)
3.411
24.2 Parameters
of execution
Version: 3.07
Machine: CRAY C90
System:
UNICOS 80.
Overall dimension memory:
8 megawords
Time CPU To use:
4.0 seconds
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
26/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
25 Modeling
R
25.1 Characteristics of modeling
Formulation pressure elements
PLAN
“ACOUSTIC”
(
SEG3
AND
TRIA6
)
Cutting =
15
meshs TRIA6 according to the x axis
2
meshs TRIA6 according to the y axis
Limiting conditions:
VITE_FACE:
(Group_ma: Input
Vnor: 0.014)
IMPE_FACE:
(Group_ma: Exit
Impe: 445.9)
Name of the nodes
With = No1
B = NO5
C = No2
D = No6
25.2 Characteristics of the mesh
A number of nodes:
155
A number of meshs and types:
60
TRIA6
4
SEG3
25.3 Functionalities
tested
Controls
Keys
AFFE_MODELE
“ACOUSTIC”
“PLANE”
GROUP_MA
[U4.22.01]
DEFI_MATERIAU
FLUID
RHO
CELE_R
[U4.23.01]
AFFE_CHAR_MECA
VITE_FACE
IMPE_FACE
VNOR
IMPE
GROUP_MA
[U4.25.01]
CALC_MATR_ELEM
“RIGI_MECA”
“MASS_MECA”
“IMPE_MECA”
MODEL
CHAM_MATER
CHARGE
[U4.41.01]
CALC_VECT_ELEM
“CHAR_MECA”
MODEL
CHAM_MATER
CHARGE
[U4.41.02]
DYNA_LINE_HARM
[U4.54.02]
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
27/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
26
Results of modeling R
26.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real, imag)
( 6.2426, 0.0)
( 6.2473, - 0.0105)
0.184
B
p (real, imag)
( 6.2426, 0.0)
( 6.2436, - 0.0029)
0.050
C
p (real, imag)
(6.0237, 1.6387)
(6.0190, 1.6517)
0.221
D
p (real, imag)
(6.0237, 1.6387)
(6.0231, 1.6446)
0.094
26.2 Parameters
of execution
Version: 3.07
Machine: CRAY C90
System:
UNICOS 80.
Overall dimension memory:
8 megawords
Time CPU To use:
3.8 seconds
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
28/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
27 Modeling
S
27.1 Characteristics of modeling
Formulation pressure elements
PLAN
“ACOUSTIC”
(
SEG2
AND
TRIA3
)
Cutting =
30
meshs TRIA3 according to the x axis
4
meshs TRIA3 according to the y axis
Limiting conditions:
VITE_FACE:
(Group_ma: Input
Vnor: 0.014)
IMPE_FACE:
(Group_ma: Exit
Impe: 445.9)
Name of the nodes
With = No1
B = No237
C = No2
D = No205
27.2 Characteristics of the mesh
A number of nodes:
155
A number of meshs and types:
240
TRIA3
8
SEG2
27.3 Functionalities
tested
Controls
Keys
AFFE_MODELE
“ACOUSTIC”
“PLANE”
GROUP_MA
[U4.22.01]
DEFI_MATERIAU
FLUID
RHO
CELE_R
[U4.23.01]
AFFE_CHAR_MECA
VITE_FACE
IMPE_FACE
VNOR
IMPE
GROUP_MA
[U4.25.01]
CALC_MATR_ELEM
“RIGI_MECA”
“MASS_MECA”
“IMPE_MECA”
MODEL
CHAM_MATER
CHARGE
[U4.41.01]
CALC_VECT_ELEM
“CHAR_MECA”
MODEL
CHAM_MATER
CHARGE
[U4.41.02]
DYNA_LINE_HARM
[U4.54.02]
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
29/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
28
Results of modeling S
28.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real, imag)
( 6.2426, 0.0)
( 6.1959, - 0.0157)
0.803
B
p (real, imag)
( 6.2426, 0.0)
( 6.2444, 0.0058)
0.097
C
p (real, imag)
(6.0237, 1.6387)
(5.9655, 2.0110)
6.036
D
p (real, imag)
(6.0237, 1.6387)
(5.9199, 1.9838)
5.774
28.2 Parameters
of execution
Version: 3.07
Machine: CRAY C90
System:
UNICOS 80.
Overall dimension memory:
8 megawords
Time CPU To use:
4.2 seconds
Code_Aster
®
Version
4.0
Titrate:
AHLV100 Guides wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B
Page:
30/30
Manual of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
29
Summary of the results
Modelings give the awaited results. It will be noted however that times CPU are
appreciably more important than those mentioned in the cards of validation AHLV100 of the 11/8/95
(V8.22.100 Document).
In modelings using of the tetrahedrons or the triangles, the distribution of the pressure is less
uniform that in the other cases following the non-uniformity of the mesh.