Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
1/30
Organization (S): EDF/EP/AMV
Handbook of Validation
V8.22 booklet: Harmonic accoustics
Document: V8.22.100
AHLV100 - Guide of 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.
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
2/30
1
Problem of reference
1.1 Geometry
y
wave
plane
output
B
D
anechoic
O
X
With
C
surface side rigid
Z
Tube with rectangular section:
length:
L = lx = 1.0 m
height:
H = ly = 0.1 m
width:
L = lz = 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. m3
Co = 343. Mr. s1
1.3
Boundary conditions and loading
Normal speed at the entry
V = Vn * exp (it) with Vn = 0.014 Mr. s1
F = 500 Hz
Impedance at the end CD
Z = O. Co = 445.9 Kg.m2 s1
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
3/30
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:
(px, y, Z) = A ex (pikx) + B ex (p-ikx)
· for vibratory speed:
(
1
V X, y, Z) = -
[A (
exp ikx) - B E
(
xp - ikx)]E
.c
X
0
0
· With and B are determined by the boundary conditions:
in X = 0
Vn = Vn0
in X = L
(pL, y, Z) = Z. (
V L, y, Z) .nL
Z - .c
.c .V
With =
B
0
0 exp (- 2ikL)
0
0
N
and
B =
with K =
Z + .c
0
0
Z - .c
C
0
0 exp (-
0
2 ikL) -
1
Z + .c
0
0
In the studied case, the output of the guide is anechoic: Z = C
0 0. One thus has:
· for the pressure:
p (X, y, Z) = C V exp (
0 0
- ikx)
N
· for speed:
(
V X, y, Z) = - V exp (- ikx) .e
N
X
· and for the acoustic intensity:
1
1
I =
V * =
2
p
C V .e
2
2 0 0 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:
/
1 2
2
2
2
C
m
N
p
F
= 0
+
+
m, N, p
where m, N, p are entireties 0
2 2
2
2
X
1
y
1
Z
1
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 - Thčse (1989).
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
4/30
3 Modeling
With
3.1
Characteristics of modeling
Formulation pressure elements 3D “ACOUSTIQUE” (ACOU_HEXA20 and ACOU_FACE8)
y
vis-a-vis impedance
imposed
B
D
X
vis-a-vis speed
C
normal imposéeA
Z
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: Output
Impe: IH 445.9 0.)
Name of the nodes
With = No1
B = No780
C = No751
D = No763
3.2
Characteristics of the grid
A number of nodes:
471
A number of meshs and types:
60 HEXA20 8 QUAD8
3.3 Functionalities
tested
Commands
Keys
AFFE_MODELE
“ACOUSTIQUE”
“3D”
TOUT
[U4.22.01]
DEFI_MATERIAU
FLUIDE
RHO
[U4.23.01]
CELE_C
AFFE_CHAR_ACOU
MODELE
[U4.25.03]
VITE_FACE
VNOR
GROUP_MA
IMPE_FACE
IMPE
CALC_MATR_ELEM
“RIGI_ACOU”
MODELE
[U4.41.01]
“MASS_ACOU”
CHAM_MATER
“AMOR_ACOU”
CHARGE
COMB_MATR_ASSE
COMB_R
PARTIE
REEL
[U4.53.01]
IMAG
MODE_ITER_SIMULT
“BANDE”
[U4.52.01]
CALC_VECT_ELEM
“CHAR_ACOU”
MODELE
[U4.41.02]
CHAM_MATER
CHARGE
DYNA_LINE_HARM
[U4.54.01]
CALC_ELEM
“PRES_ELNO_REEL”
PRES
[U4.61.02]
“PRES_ELNO_IMAG”
CHAM_MATER
“INTE_ELNO_ACTI”
FREQ
“INTE_ELNO_REAC”
CALC_CHAM_ELEM
“PRES_ELNO_DBEL”
PRES
“PRES_ELNO_REEL”
CHAM_MATER
“PRES_ELNO_IMAG”
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
5/30
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
1
0
0
171.5
171.500
+0.0001
3
2
0
0
343.0
343.007
+0.002
4
3
0
0
514.5
514.555
+0.01
5
4
0
0
686.0
686.226
+0.03
6
5
0
0
857.5
858.178
+0.08
7
0
0
1
857.5
860.719
+0.4
8
1
0
1
874.482
877.640
+0.4
9
2
0
1
923.556
926.568
+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
Obstruction memory:
8 megawords
Time CPU To use:
2.6 seconds
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
6/30
5 Modeling
B
5.1
Characteristics of modeling
Formulation pressure potential of elements displacements “3d_FLUIDE” (MEFL_HEXA20 and
MEFL_FACE8)
y
vis-a-vis
impedance
imposed
B
D
X
vis-a-vis speed
C
normal
With
imposed
Z
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: Output
IMPE: 445.9)
Name of the nodes
With = No1
B = No780
C = No751
D = No763
5.2
Characteristics of the grid
A number of nodes:
471
A number of meshs and types:
60 HEXA20 8 QUAD8
5.3 Functionalities
tested
Commands
Keys
AFFE_MODELE
“MECANIQUE”
“3d_FLUIDE”
GROUP_MA
[U4.22.01]
DEFI_MATERIAU
FLUIDE
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”
MODELE
[U4.41.01]
“MASS_MECA”
CHAM_MATER
“IMPE_MECA”
CHARGE
CALC_VECT_ELEM
“CHAR_MECA”
MODELE
[U4.41.02]
CHAM_MATER
CHARGE
DYNA_LINE_HARM
[U4.54.02]
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
7/30
6
Results of modeling B
6.1 Values
tested
Localization
Reference
Reference
Aster
% difference
With
p (real)
6.2426
6.2425
0.001
p (imag)
0.0
0.0003
-
B
p (real)
6.2426
6.2425
0.001
p (imag)
0.0
0.0003
-
C
p (real)
6.0237
6.0222
0.02
p (imag)
1.6387
1.6444
0.34
D
p (real)
6.0237
6.0222
0.02
p (imag)
1.6387
1.6444
0.34
6.2 Parameters
of execution
Version: 3.05
Machine: CRAY C90
System:
UNICOS 8.0
Obstruction memory:
8 megawords
Time CPU To use:
5.7 seconds
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
8/30
7 Modeling
D
7.1
Characteristics of modeling
Formulation pressure potential of elements displacements “2d_FLUIDE” (MEFLSE3 and MEFLQU8)
y
vis-a-vis
impedance
imposed
B
D
X
vis-a-vis speed
With
C
imposed normal
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: Output
IMPE: 445.9)
Name of the nodes
With = No1
B = No780
C = No151
D = No153
7.2
Characteristics of the grid
A number of nodes:
125
A number of meshs and types:
30 QUAD8 4 SEG3
7.3 Functionalities
tested
Commands
Keys
AFFE_MODELE
“MECANIQUE”
“2d_FLUIDE”
GROUP_MA
[U4.22.01]
DEFI_MATERIAU
FLUIDE
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”
MODELE
[U4.41.01]
“MASS_MECA”
CHAM_MATER
“IMPE_MECA”
CHARGE
CALC_VECT_ELEM
“CHAR_MECA”
MODELE
[U4.41.02]
CHAM_MATER
CHARGE
DYNA_LINE_HARM
[U4.54.02]
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
9/30
8
Results of modeling D
8.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real)
6.2426
6.2425
0.001
p (imag)
0.0
0.0003
-
B
p (real)
6.2426
6.2425
0.001
p (imag)
0.0
0.0003
-
C
p (real)
6.0237
6.0222
0.02
p (imag)
1.6387
1.6441
0.37
D
p (real)
6.0237
6.0222
0.02
p (imag)
1.6387
1.6441
0.37
8.2 Parameters
of execution
Version: 3.00
Machine: CRAY C90
System:
UNICOS 8.0
Obstruction memory:
8 megawords
Time CPU To use:
2.8 seconds
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
10/30
9 Modeling
E
9.1
Characteristics of modeling
Formulation pressure potential of displacements elements “AXIS_FLUIDE” (MEAXFLS3 and
MEAXFLQ8)
vis-a-vis speed
With
C
imposed normal
y
B
D
vis-a-vis impedance
X
imposed
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: Output
IMPE: 445.9)
Name of the nodes
With = No1
B = No780
C = No151
D = No153
9.2
Characteristics of the grid
A number of nodes:
125
A number of meshs and types:
30 QUAD8 4 SEG3
9.3 Functionalities
tested
Commands
Keys
AFFE_MODELE
“MECANIQUE”
“AXIS_FLUIDE”
GROUP_MA
[U4.22.01]
DEFI_MATERIAU
FLUIDE
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”
MODELE
[U4.41.01]
“MASS_MECA”
CHAM_MATER
“IMPE_MECA”
CHARGE
CALC_VECT_ELEM
“CHAR_MECA”
MODELE
[U4.41.02]
CHAM_MATER
CHARGE
DYNA_LINE_HARM
[U4.54.02]
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
11/30
10
Results of modeling E
10.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real)
6.2426
6.2425
0.001
p (imag)
0.0
0.0003
-
B
p (real)
6.2426
6.2425
0.001
p (imag)
0.0
0.0003
-
C
p (real)
6.0237
6.0222
0.02
p (imag)
1.6387
1.6441
0.37
D
p (real)
6.0237
6.0222
0.02
p (imag)
1.6387
1.6441
0.37
10.2 Parameters
of execution
Version: 3.02
Machine: CRAY C90
System:
UNICOS 8.0
Obstruction memory:
8 megawords
Time CPU To use:
4.1 seconds
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
12/30
11 Modeling
F
11.1 Characteristics of modeling
Formulation pressure elements PLAN “ACOUSTIQUE” (SEG3 AND QUAD8)
y
vis-a-vis
impedance
imposed
B
D
X
vis-a-vis speed
With
C
imposed normal
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: Output
Impe: 445.9)
Name of the nodes
With = No1
B = No33
C = No2
D = No34
11.2 Characteristics of the grid
A number of nodes:
125
A number of meshs and types:
30 QUAD8 4 SEG3
11.3 Functionalities
tested
Commands
Keys
AFFE_MODELE
“ACOUSTIQUE”
“PLAN”
GROUP_MA
[U4.22.01]
DEFI_MATERIAU
FLUIDE
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”
MODELE
[U4.41.01]
“MASS_MECA”
CHAM_MATER
“IMPE_MECA”
CHARGE
CALC_VECT_ELEM
“CHAR_MECA”
MODELE
[U4.41.02]
CHAM_MATER
CHARGE
DYNA_LINE_HARM
[U4.54.02]
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
13/30
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.
Obstruction memory:
8 megawords
Time CPU To use:
3.8 seconds
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
14/30
13 Modeling
G
13.1 Characteristics of modeling
Formulation pressure elements 3D “ACOUSTIQUE” (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 grid
A number of nodes:
775
A number of meshs and types:
480 HEXA8 32 QUAD4
13.3 Functionalities
tested
Commands
Keys
AFFE_MODELE
“ACOUSTIQUE”
“3D”
TOUT
[U4.22.01]
DEFI_MATERIAU
FLUIDE
RHO
[U4.23.01]
CELE_C
AFFE_CHAR_ACOU
MODELE
[U4.25.03]
VITE_FACE
VNOR
GROUP_MA
IMPE_FACE
IMPE
CALC_MATR_ELEM
“RIGI_ACOU”
MODELE
[U4.41.01]
“MASS_ACOU”
CHAM_MATER
“AMOR_ACOU”
CHARGE
CALC_VECT_ELEM
“CHAR_ACOU”
MODELE
[U4.41.02]
CHAM_MATER
CHARGE
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”
MODE_ITER_SIMULT
“BANDE”
[U4.52.01]
DYNA_LINE_HARM
[U4.54.01]
COMB_MATR_ASSE
COMB_R
PARTIE
REEL
[U4.53.01]
IMAG
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
15/30
14
Results of modeling G
14.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real, imag)
( 6.2426, 0.0000)
( 6.2469, 0.0137)
0.231
Intensité_Acou
0.0437
0.0431
- 1.47
B
p (real, imag)
( 6.2426, 0.0000)
( 6.2469, 0.0137)
0.231
Intensité_Acou
0.0437
0.0431
- 1.47
C
p (real, imag)
(6.0237, 1.6387)
(5.9663, 1.8438)
3.411
Intensité_Acou
0.0437
0.0431
- 1.47
D
p (real, imag)
(6.0237, 1.6387)
(5.9663, 1.8438)
3.411
Intensité_Acou
0.0437
0.0431
- 1.47
Frequency (Hz)
Command of the clean mode I
m
N
p
Reference
Aster
% difference
2
1
0
0
171.5
171.578
0.046
3
2
0
0
343.0
343.627
0.183
4
3
0
0
514.5
516.618
0.412
5
4
0
0
686.0
691.026
0.733
6
5
0
0
857.5
867.326
1.146
7
0
0
1
857.5
879.674
2.586
8
1
0
1
874.482
896.251
2.489
9
2
0
1
923.556
944.408
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.
Obstruction memory:
8 megawords
Time CPU To use:
8.9 seconds
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
16/30
15 Modeling
H
15.1 Characteristics of modeling
Formulation pressure elements 3D “ACOUSTIQUE” (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 grid
A number of nodes:
456
A number of meshs and types:
90 PENTA15 12 TRIA6
15.3 Functionalities
tested
Commands
Keys
AFFE_MODELE
“ACOUSTIQUE”
“3D”
TOUT
[U4.22.01]
DEFI_MATERIAU
FLUIDE
RHO
[U4.23.01]
CELE_C
AFFE_CHAR_ACOU
MODELE
[U4.25.03]
VITE_FACE
VNOR
GROUP_MA
IMPE_FACE
IMPE
CALC_MATR_ELEM
“RIGI_ACOU”
MODELE
[U4.41.01]
“MASS_ACOU”
CHAM_MATER
“AMOR_ACOU”
CHARGE
CALC_VECT_ELEM
“CHAR_ACOU”
MODELE
[U4.41.02]
CHAM_MATER
CHARGE
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”
MODE_ITER_SIMULT
“BANDE”
[U4.52.01]
DYNA_LINE_HARM
[U4.54.01]
COMB_MATR_ASSE
COMB_R
PARTIE
REEL
[U4.53.01]
IMAG
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
17/30
16
Results of modeling C
16.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real, imag)
( 6.2426, 0.0000)
( 6.2425-, 0.0003)
0.005
Intensité_Acou
0.0437
0.0450
2.97
B
p (real, imag)
( 6.2426, 0.0000)
( 6.2425, 0.0003)
0.005
Intensité_Acou
0.0437
0.0450
2.97
C
p (real, imag)
(6.0237, 1.6387)
(6.0222, 1.6441)
0.089
Intensité_Acou
0.0437
0.0450
2.97
D
p (real, imag)
(6.0237, 1.6387)
(6.0222, 1.6441)
0.089
Intensité_Acou
0.0437
0.0450
2.97
Frequency (Hz)
Command of the clean mode I
m
N
p
Reference
Aster
% difference
2
1
0
0
171.5
171.500
0.000
3
2
0
0
343.0
343.007
0.002
4
3
0
0
514.5
514.555
0.011
5
4
0
0
686.0
686.226
0.033
6
5
0
0
857.5
858.178
0.079
7
0
0
1
857.5
860.470
0.346
8
1
0
1
874.482
877.395
0.333
9
2
0
1
923.556
926.335
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.
Obstruction memory:
8 megawords
Time CPU To use:
7.0 seconds
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
18/30
17 Modeling
I
17.1 Characteristics of modeling
Formulation pressure elements 3D “ACOUSTIQUE” (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 grid
A number of nodes:
775
A number of meshs and types:
960 PENTA6 64 TRIA3
17.3 Functionalities
tested
Commands
Keys
AFFE_MODELE
“ACOUSTIQUE”
“3D”
TOUT
[U4.22.01]
DEFI_MATERIAU
FLUIDE
RHO
[U4.23.01]
CELE_C
AFFE_CHAR_ACOU
MODELE
[U4.25.03]
VITE_FACE
VNOR
GROUP_MA
IMPE_FACE
IMPE
CALC_MATR_ELEM
“RIGI_ACOU”
MODELE
[U4.41.01]
“MASS_ACOU”
CHAM_MATER
“AMOR_ACOU”
CHARGE
CALC_VECT_ELEM
“CHAR_ACOU”
MODELE
[U4.41.02]
CHAM_MATER
CHARGE
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”
MODE_ITER_SIMULT
“BANDE”
[U4.52.01]
DYNA_LINE_HARM
[U4.54.01]
COMB_MATR_ASSE
COMB_R
PARTIE
REEL
[U4.53.01]
IMAG
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
19/30
18
Results of modeling I
18.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real, imag)
( 6.2426, 0.0000)
( 6.2469-, 0.0138)
0.231
Intensité_Acou
0.0437
0.0431
- 1.47
B
p (real, imag)
( 6.2426, 0.0000)
( 6.2469, 0.0138)
0.231
Intensité_Acou
0.0437
0.0431
- 1.47
C
p (real, imag)
(6.0237, 1.6387)
(5.9663, 1.8438)
3.411
Intensité_Acou
0.0437
0.0431
- 1.47
D
p (real, imag)
(6.0237, 1.6387)
(5.9663, 1.8438)
3.411
Intensité_Acou
0.0437
0.0431
- 1.47
Frequency (Hz)
Command of the clean mode I
m
N
p
Reference
Aster
% difference
2
1
0
0
171.5
171.578
0.046
3
2
0
0
343.0
343.627
0.183
4
3
0
0
514.5
516.618
0.412
5
4
0
0
686.0
691.026
0.733
6
5
0
0
857.5
867.326
1.146
7
0
0
1
857.5
879.045
2.512
8
1
0
1
874.482
895.633
2.419
9
2
0
1
923.556
943.821
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.
Obstruction memory:
8 megawords
Time CPU To use:
9.7 seconds
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
20/30
19 Modeling
J
19.1 Characteristics of modeling
Formulation pressure elements 3D “ACOUSTIQUE” (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 grid
A number of nodes:
870
A number of meshs and types:
421 TETRA10 16 TRIA6
19.3 Functionalities
tested
Commands
Keys
AFFE_MODELE
“ACOUSTIQUE”
“3D”
TOUT
[U4.22.01]
DEFI_MATERIAU
FLUIDE
RHO
[U4.23.01]
CELE_C
AFFE_CHAR_ACOU
MODELE
[U4.25.03]
VITE_FACE
VNOR
GROUP_MA
IMPE_FACE
IMPE
CALC_MATR_ELEM
“RIGI_ACOU”
MODELE
[U4.41.01]
“MASS_ACOU”
CHAM_MATER
“AMOR_ACOU”
CHARGE
CALC_VECT_ELEM
“CHAR_ACOU”
MODELE
[U4.41.02]
CHAM_MATER
CHARGE
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”
MODE_ITER_SIMULT
“BANDE”
[U4.52.01]
DYNA_LINE_HARM
[U4.54.01]
COMB_MATR_ASSE
COMB_R
PARTIE
REEL
[U4.53.01]
IMAG
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
21/30
20
Results of modeling J
20.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real, imag)
( 6.2426, 0.0000)
( 6.2483-, - 0.0162)
0.272
Intensité_Acou
0.0437
0.0447
2.398
B
p (real, imag)
( 6.2426, 0.0000)
( 6.2465, - 0.0122)
0.205
Intensité_Acou
0.0437
0.0452
3.507
C
p (real, imag)
(6.0237, 1.6387)
(6.0201, 1.6491)
0.176
Intensité_Acou
0.0437
0.0443
1.283
D
p (real, imag)
(6.0237, 1.6387)
(6.0284, 1.6319)
0.133
Intensité_Acou
0.0437
0.0449
2.797
Frequency (Hz)
Command of the clean mode I
m
N
p
Reference
Aster
% difference
2
1
0
0
171.5
171.500
0.000
3
2
0
0
343.0
343.005
0.001
4
3
0
0
514.5
514.534
0.007
5
4
0
0
686.0
686.146
0.021
6
5
0
0
857.5
857.924
0.049
7
0
0
1
857.5
860.111
0.304
8
1
0
1
874.482
877.250
0.317
9
2
0
1
923.556
927.079
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.
Obstruction memory:
8 megawords
Time CPU To use:
9.5 seconds
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
22/30
21 Modeling
K
21.1 Characteristics of modeling
Formulation pressure elements 3D “ACOUSTIQUE” (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 grid
A number of nodes:
685
A number of meshs and types:
2180 TETRA4 64 TRIA6
21.3 Functionalities
tested
Commands
Keys
AFFE_MODELE
“ACOUSTIQUE”
“3D”
TOUT
[U4.22.01]
DEFI_MATERIAU
FLUIDE
RHO
[U4.23.01]
CELE_C
AFFE_CHAR_ACOU
MODELE
[U4.25.03]
VITE_FACE
VNOR
GROUP_MA
IMPE_FACE
IMPE
CALC_MATR_ELEM
“RIGI_ACOU”
MODELE
[U4.41.01]
“MASS_ACOU”
CHAM_MATER
“AMOR_ACOU”
CHARGE
CALC_VECT_ELEM
“CHAR_ACOU”
MODELE
[U4.41.02]
CHAM_MATER
CHARGE
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”
MODE_ITER_SIMULT
“BANDE”
[U4.52.01]
DYNA_LINE_HARM
[U4.54.01]
COMB_MATR_ASSE
COMB_R
PARTIE
REEL
[U4.53.01]
IMAG
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
23/30
22
Results of modeling K
22.1 Values
tested
Localization
Sizes
Reference
Aster
% difference
With
p (real, imag)
( 6.2426, 0.0000)
( 6.2321, 0.0342)
0.574
Intensité_Acou
0.0437
0.0431
- 1.439
B
p (real, imag)
( 6.2426, 0.0000)
( 6.1797, 0.0300)
1.116
Intensité_Acou
0.0437
0.0427
- 2.274
C
p (real, imag)
(6.0237, 1.6387)
(5.8478, 1.8750)
4.719
Intensité_Acou
0.0437
0.0421
- 3.571
D
p (real, imag)
(6.0237, 1.6387)
(5.9706, 1.9224)
4.623
Intensité_Acou
0.0437
0.0427
- 2.212
Frequency (Hz)
Command of the clean mode I
m
N
p
Reference
Aster
% difference
2
1
0
0
171.5
171.689
0.110
3
2
0
0
343.0
343.870
0.254
4
3
0
0
514.5
517.434
0.570
5
4
0
0
686.0
692.615
0.964
6
5
0
0
857.5
870.670
1.536
7
0
0
1
857.5
876.335
2.196
8
1
0
1
874.482
896.171
2.480
9
2
0
1
923.556
953.782
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.
Obstruction memory:
8 megawords
Time CPU To use:
11.7 seconds
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
24/30
23 Modeling
Q
23.1 Characteristics of modeling
Formulation pressure elements PLAN “ACOUSTIQUE” (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: Output
Impe: 445.9)
Name of the nodes
With = No1
B = No237
C = No2
D = No205
23.2 Characteristics of the grid
A number of nodes:
155
A number of meshs and types:
120 QUAD8 8 SEG2
23.3 Functionalities
tested
Commands
Keys
AFFE_MODELE
“ACOUSTIQUE”
“PLAN”
GROUP_MA
[U4.22.01]
DEFI_MATERIAU
FLUIDE
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”
MODELE
[U4.41.01]
“MASS_MECA”
CHAM_MATER
“IMPE_MECA”
CHARGE
CALC_VECT_ELEM
“CHAR_MECA”
MODELE
[U4.41.02]
CHAM_MATER
CHARGE
DYNA_LINE_HARM
[U4.54.02]
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
25/30
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.
Obstruction memory:
8 megawords
Time CPU To use:
4.0 seconds
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
26/30
25 Modeling
R
25.1 Characteristics of modeling
Formulation pressure elements PLAN “ACOUSTIQUE” (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: Output
Impe: 445.9)
Name of the nodes
With = No1
B = NO5
C = No2
D = No6
25.2 Characteristics of the grid
A number of nodes:
155
A number of meshs and types:
60 TRIA6 4 SEG3
25.3 Functionalities
tested
Commands
Keys
AFFE_MODELE
“ACOUSTIQUE”
“PLAN”
GROUP_MA
[U4.22.01]
DEFI_MATERIAU
FLUIDE
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”
MODELE
[U4.41.01]
“MASS_MECA”
CHAM_MATER
“IMPE_MECA”
CHARGE
CALC_VECT_ELEM
“CHAR_MECA”
MODELE
[U4.41.02]
CHAM_MATER
CHARGE
DYNA_LINE_HARM
[U4.54.02]
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
27/30
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.
Obstruction memory:
8 megawords
Time CPU To use:
3.8 seconds
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
28/30
27 Modeling
S
27.1 Characteristics of modeling
Formulation pressure elements PLAN “ACOUSTIQUE” (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: Output
Impe: 445.9)
Name of the nodes
With = No1
B = No237
C = No2
D = No205
27.2 Characteristics of the grid
A number of nodes:
155
A number of meshs and types:
240 TRIA3 8 SEG2
27.3 Functionalities
tested
Commands
Keys
AFFE_MODELE
“ACOUSTIQUE”
“PLAN”
GROUP_MA
[U4.22.01]
DEFI_MATERIAU
FLUIDE
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”
MODELE
[U4.41.01]
“MASS_MECA”
CHAM_MATER
“IMPE_MECA”
CHARGE
CALC_VECT_ELEM
“CHAR_MECA”
MODELE
[U4.41.02]
CHAM_MATER
CHARGE
DYNA_LINE_HARM
[U4.54.02]
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
29/30
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.
Obstruction memory:
8 megawords
Time CPU To use:
4.2 seconds
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X
Code_Aster ®
Version
4.0
Titrate:
AHLV100 Guide of wave at anechoic exit
Date:
13/10/98
Author (S):
F. STIFKENS, G. ROUSSEAU
Key:
V8.22.100-B Page:
30/30
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 grid.
Handbook of Validation
V8.22 booklet: Harmonic accoustics
HX-XX/98/XXX - Ind X