Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process September 28, 2017 | Tanja Richardt thyssenkrupp Marine Systems
Virtual prototyping of fully appended naval
vessels by integrating ANSYS-CFX into the hull form optimization process
September 28, 2017 | Tanja Richardt
thyssenkrupp Marine Systems
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
2
Agenda
• Introduction
• Parametric modeling of hull form and appendages
• Integration of ANSYS-CFX in CAESES
• Application
− Optimization OPV
− Aft-body parameter variation
− Interceptor optimization
− Comparison of different bow shapes
• Conformity to model test results
• Conclusion
Result of multi-
objective
optimization | 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
3
Hull form optimization process
Parametric Modeling Optimization (Potential flow)
Optimization (RANSE)
Numerical towing tank
1 2 4
Basic curves
Variables
Pressure distribution
& streamlines
Generated
smooth hull form
Parameter evaluation
Automatic mesh
generation
CFD
Results
Comparison of different bow types
Interceptor optimization
Aft-body variation
Numerical towing tank
3
Constraints
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
4
Parametric modeling
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
5
Parametric modeling
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
6
Appendages
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
7
Geometry export
Surfaces Trimeshes Solids
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
8
Geometry export
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
9
Integration of ANSYS CFX -Exports
Export:
• Solids (Domain)
• Trimesh (Watersurface)
• Surfaces (Brackets)
• Curves (All edges)
• Points
• Geometry information
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
10
Integration of ANSYS CFX – Software connector
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
11
Integration of ANSYS CFX – Batch file
• ICEM - meshing
• CFX Pre - generating Input-Files
• CFX Solver - steady and transient calculation
• CFX Post - Evaluation of results
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
12
Integration of ANSYS CFX – Mesh generation by
ICEM • Script file for icem,
• import all essential
geometry information
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
13
Integration of ANSYS CFX – CFX POST
Wavepattern
Streamlines
Wetted surface
Trim Fx
Sinkage Convergence
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
14
Hull form optimization – OPV (LoA = 91.2 m)
Displacement = 2400 t, v = 20 kn, 26kn
Displacement = 2200 t, v = 28 kn
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
15
Evaluation of designs
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
16
Aft-body optimization
Aft-body variation: 12 variants
Parameter Value
Interceptorheight 0.1; 0.18; 0.22
dZPropAtTransom 0; 0.3
dZCpcBilgeProp 0; 0.2
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
17
Interceptor optimization
738
740
742
744
746
748
750
752
754
756
0.05 0.07 0.09 0.11 0.13 0.15 0.17 0.19 0.21 0.23 0.25
RT [kN] Poly. (RT [kN])
RT [kN]
Interceptor height [m]
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
18
Comparison of different bow types
at two differnt load cases Velocity: 20 kn & 26 kn
(Froude 0.34 & 0.26)
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
19
Comparison of calculated values and model test
results
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
20
Next step
| 2017 / 09 / 28 | Virtual prototyping of fully appended naval vessels by integrating ANSYS-CFX into the hull form optimization process | Tanja Richardt
thyssenkrupp Marine Systems
21
Conclusions
• Wide range of hull form variation in a short time frame
• Optimized hull form for different speeds and loads by fulfilling
demanding requirements
• Maximum speed within the given cost and engine power and
economic use at the operational profile
• Consideration of influence of aftbody variations, appendages and
floating position caused by interecptor
• Reliable results in early design
• Minimized risk during the proposal stage
We can offer optimized hull shapes operating with minimum engine
power at maximum speeds within a short time frame.