Download - Altair Conf 2011 R Euser
-
7/27/2019 Altair Conf 2011 R Euser
1/32
06/11/11
Water wave impact
on rigid walls
BSc. R. Euser
-
7/27/2019 Altair Conf 2011 R Euser
2/32
Contents
About Femto Egineering
Water wave impacts
Simulating water wave impactsusing Radioss SPH
-
7/27/2019 Altair Conf 2011 R Euser
3/32
About femto engineering
-
7/27/2019 Altair Conf 2011 R Euser
4/32
Company
About Software sales Consultancy
Engineering agency,offering both
consultancy andsoftware for structural
analysis (>25
employees)
More than 12 yearsexperience in CAEActive in BeNeLux
and Ukraine
Development of clientspecific software &
customization ofFemap & Hyperworks
Partner of Siemens
Analysis software
Training
Support
FE-analysis
Product optimization
Certification
Outsourcing
-
7/27/2019 Altair Conf 2011 R Euser
5/32
Activities
-
7/27/2019 Altair Conf 2011 R Euser
6/32
Customers
-
7/27/2019 Altair Conf 2011 R Euser
7/32
Offshore projects
-
7/27/2019 Altair Conf 2011 R Euser
8/32
Water wave impacts
-
7/27/2019 Altair Conf 2011 R Euser
9/32
Applications
Offshore
Coastal
Piping
Automotive
-
7/27/2019 Altair Conf 2011 R Euser
10/32
About wave impacts
Wave evolution
Surrounding structures Wave pressure
Air bubbles (aeration)
-
7/27/2019 Altair Conf 2011 R Euser
11/32
Wave evolution
Breaking wave
Steepening wave
Stable wave
Crest
Trough
Crest
Air pocket
Trough
Trough
Crest
-
7/27/2019 Altair Conf 2011 R Euser
12/32
Surrounding structures
Shape Roughness
Stiffness
-
7/27/2019 Altair Conf 2011 R Euser
13/32
Wave pressure
Px=tbefore
tafter
px, td t
VelocityPressureVelocity
Wave Eye
Worst case
Pressure impulse
-
7/27/2019 Altair Conf 2011 R Euser
14/32
Air bubbles (aeration)
Positives:
Pressurereduction
Damping
Negatives:
Longer impactduration
Larger impactarea
t = 0.0 ms t = 3.5 ms
Evolution of the air cavity during a depressurized wave impact.Lugni et al.
-
7/27/2019 Altair Conf 2011 R Euser
15/32
Simulating water wave impactsusing Radioss SPH
-
7/27/2019 Altair Conf 2011 R Euser
16/32
Contents
Radioss CFD methods
Radioss SPH approach
SPH Simulations:
2D dam break correlation
2D water wave impact on a rigid wall
Conclusions
-
7/27/2019 Altair Conf 2011 R Euser
17/32
-
7/27/2019 Altair Conf 2011 R Euser
18/32
-
7/27/2019 Altair Conf 2011 R Euser
19/32
2D dam break correlation
-
7/27/2019 Altair Conf 2011 R Euser
20/32
Load case
3.55 m0.38 m
d
d0
d0=0.15m
d=0.018mvgate=1.5m/s
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
0
0.5
1
1.5
2
Gate velocity
t [s]
v[m/s]
S
-
7/27/2019 Altair Conf 2011 R Euser
21/32
Radioss SPH model
30,225 particles
dparticle=0.002m
R lt
-
7/27/2019 Altair Conf 2011 R Euser
22/32
Results
0.219 s 0.281 s 0.343 s
0.468 s0.406 s
=0.010
=0.010
0 1500300 600 900 1200
Pressure[Pa]
http://movies/Dam_Break_2D_SPH_UHR_c.mpghttp://movies/Dam_Break_2D_SPH_UHR_c.mpghttp://movies/Dam_Break_2D_SPH_UHR_c.mpghttp://movies/Dam_Break_2D_SPH_UHR_c.mpghttp://movies/Dam_Break_2D_SPH_UHR_c.mpghttp://movies/Dam_Break_2D_SPH_UHR_c.mpghttp://movies/Dam_Break_2D_SPH_UHR_c.mpghttp://movies/Dam_Break_2D_SPH_UHR_c.mpg -
7/27/2019 Altair Conf 2011 R Euser
23/32
2D water wave impacton a rigid wall
G l
-
7/27/2019 Altair Conf 2011 R Euser
24/32
Goal
Measure the effect of particle size onimpact pressure
Load cases
-
7/27/2019 Altair Conf 2011 R Euser
25/32
Load cases
Wave 1 Wave 2
0 2 4 6 8 10 12 14 16 18 20
-10
-5
0
5
10
Acceleration vertical plate
t [s]
a[m/s^2]
0 2 4 6 8 10 12 14 16 18 20
-3
-2
-1
0
1
2
3
Acceleration vertical plate
t [s]
a[m/s^2]
35 m
Sensors20x20 cm
Plate
15 m
15 m
Sensors20x20 cm
Plate
15 m
Models
-
7/27/2019 Altair Conf 2011 R Euser
26/32
Models
Water particles
Detail A
Detail A
Model Particle size [m] Particle count
R1 0.2 3,750
R2 0.04 93,750
R3 0.02 375,000
Object Element type
Plate SPH
Rigid wall Shell
Water SPH
Sensors RBE2
Sensors
Impact measurement
-
7/27/2019 Altair Conf 2011 R Euser
27/32
Impact measurement
Px=tbefore
tafter
px, td tPressure impulse
Psensorz=T0
T1
Fsensorhsensordp
z,TDTDiscretization
Load case T0 [s] T1 [s] DT [s]
Wave 1 11.1 11.7 0.001
Wave 2 8.1 8.4 0.001
Time interval
Results Wave 1
-
7/27/2019 Altair Conf 2011 R Euser
28/32
Results Wave 1
0. 0E+00 2. 0E+04 4. 0E+04 6. 0E+04 8. 0E+04 1. 0E+05
0
2
4
6
8
10
12
14
Pressure Impulse
R1R2
R3
PI [Pa s]
z[m]
11.1 11.2 11.3 11.4 11.5 11.6 11.7
0.0E+00
2.0E+04
4.0E+04
6.0E+04
8.0E+04
1.0E+05
1.2E+05
1.4E+05
1.6E+05
Total Pressure
R1
R2
R3
t [s]
P[Pa]
t = 11.4 s t = 11.7 st = 11.1 s
R1
R2
R3
[m/s]
Results Wave 2
http://movies/W1R3.mpghttp://movies/W1R3.mpghttp://movies/W1R3.mpghttp://movies/W1R3.mpghttp://movies/W1R3.mpg -
7/27/2019 Altair Conf 2011 R Euser
29/32
Results Wave 2
0.0E+00 5.0E+04 1.0E+05 1.5E+05 2.0E+05
0
2
4
6
8
10
12
14
Pressure Impulse
R1
R2
R3
PI [Pa s]
z[m]
8.1 8.15 8.2 8.25 8.3 8.35 8.4
0.0E+00
1.0E+05
2.0E+05
3.0E+05
4.0E+05
5.0E+05
6.0E+05
7.0E+05
Total Pressure
R1
R2
R3
t [s]
P[Pa]
R1
t = 8.1 s t = 8.3 s t = 8.4 s
R2
R3
[m/s]
Results discussion
http://movies/W2R3.mpghttp://movies/W2R3.mpghttp://movies/W2R3.mpghttp://movies/W2R3.mpg -
7/27/2019 Altair Conf 2011 R Euser
30/32
Results discussion
Fluid velocity
Fluid pressure Total pressure (pressure peaks)
Pressure impulse
Conclusions
-
7/27/2019 Altair Conf 2011 R Euser
31/32
Conclusions
Wave impacts:
Wave evolution
Surrounding structures
Impact pressure
Aeration
Radioss SPH simulations:
2D Dam Break correlation 2D wave impacts
-
7/27/2019 Altair Conf 2011 R Euser
32/32
molslaan 1112611 rk delftT +31 (0) 15 285 05 80F +31 (0) 15 285 05 81
http://www.femto.nl/http://www.femto.nl/