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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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.