Progress of naoe-FOAM-SJTU Solver for Ship and Ocean … · 2015-07-08 · Progress of...

Progress of naoe-FOAM-SJTU Solver for Ship and Ocean Engineering Flows

Decheng Wan (万德成)Email: dcwan@sjtu.edu.cn

State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering,

Shanghai Jiao Tong UniversityICNAME 2015, June 29, 2015, Harbin

Shanghai Jiao Tong University

naoe-FOAM-SJTU Solver is developed based on OpenFOAM platform since 2006 which aims to:

• solve violent flows (high Re flows, breaking waves)

• provide different types of waves (numerical wave generation and absorption)

• study wave(current, wind)-floating structures interaction (nonlinear, 6DOF, mooring)

CFD Package of naoe-FOAM-SJTU

• An open source CFD toolkit • Written in C++• Object-oriented programming (OOP)• Provide a series of libraries

• Basic data structure• Finite volume (mesh, discretization, etc.)• Incompressible & compressible algorithms• Linear solver• Pre-processing & Post-preocessing• … 3

CFD Package of naoe-FOAM-SJTU

Advantages of OpenFOAM open source platform：

Main Structure of naoe-FOAM-SJTU

Shanghai Jiao Tong UniversityIntroduction to naeo-FOAM-SJTU

Functions

Provide wave conditions

Model structures motion

provide mooring force,

keep body steady,

restrain structures motion

// Construct incompressible turbulence modelautoPtr<incompressible::turbulenceModel> turbulence(

incompressible::turbulenceModel::New(U, phi, twoPhaseProperties));

// Sovle turbulenceturbulence->correct();

// Turbulence SettingssimulationType RASModel;

RASModel kOmegaSST;

User Input:

Example: Turbulence models

• Code is well constructed.• New method is easy to implement.

The user just need to manipulate the base

class.

A Glance at naoe-FOAM-SJTU

Shanghai Jiao Tong UniversityNumerical Wave Tank

Numerical wave tank in naoe-FOAM-SJTU

• waveTheory

Numerical Wave Tank

Shanghai Jiao Tong UniversityIrregular waves

0.6 m, 1.1s, 22, 30s p fH T N M

Multidirectional waves

Oblique Wave Tank

6DoF Motion Module

Coordinate systems

• Predicted motions• Prescribed motions

Overset Grid• A body fitted grid can be

embedded into a Cartesian background mesh.

• Two grids are mutual independence.

• Body fitted grid can be moved without restriction.

• Two grids build the connectivity through the interpolation coefficients.

Dynamic overset grids

Advantages of Overset Method• Easy to implement of local mesh refinement

Dynamic overset grids

Shanghai Jiao Tong UniversityDynamic overset grids

Mooring System

Position of structure Calculate mooring force and shape

Taut Catenary Semi-taut

Three types of mooring line:

Taut Method:Only elongation

Catenary Method:Only weight

Piecewise Extrapolation Method:Both considered

The three module are coupled

Incident wave

Mooring lines

6DoF motion module

NWT provide

Mooring System

Ship wave-making and Resistance in still water

Wigley Ship Motion in Still Water

24[ (1 )][1 ( ) ]2B x x zy

Wigley hull Grid

Single Wigley motion in still water

Shanghai Jiao Tong UniversitySingle Wigley motion in still water

Overset grid

Wave profile on hull surface at Fn=0.289

Single Wigley motion in still water

Two Wigley Ships Passing Each Other

Two Wigleys Passing Each Other

Overset grid

(1)t=5.50 (2)t=6.23(波峰)

(3)t=6.37（波谷） (4)t=10.00

Fres suface at Fn=0.30, D=0.5L

Two Wigleys Passing Each Other

Ship Motion in Waves

Shanghai Jiao Tong UniversityDTMB 5415 Ship Motion in Waves

Ship is induced to move under coming waves.

Green Water for DTMB 5415 Ship

四级横浪-0航速-粘性涡流场

LNG Tank Sloshing

Ship Maneuverability

DTMB pure sway

DTMB 5415 pure yaw

Catamaran Advancing in Regular Head Waves

Hull for numerical simulation：Delft-372 catamaran, with a rich experimental data

Main dimensions Value

Lpp 3.00 m

B 0.94 m

b 0.24 m

H 0.70 m

T 0.15 m

Δ 87.07 Kg

KG 0.34 m

LCG 1.41 m

I 53.245 Kgm2

ADDED RESISTANCE OF DELF

Animation of the free surface (λ/L=1.0)

Animation of the free surface (λ/L=1.5)

Animation of the wake wave (λ/L=1.75)

Rotating Propeller in Open Water

Shanghai Jiao Tong University HSVA KCS Model

Self-propulsion of Ship Motion

Propeller speed

Ship speed

Experiment Present Work % error CFDShip‐Iowa (DES)

CT 3.942×10-3 3.840×10-3 -2.586% 4.011×10-3

KT 0.17 0.1682 -1.061% 0.1689KQ 0.0288 0.0290 0.863% 0.029611-t 0.853 0.8857 3.838% 0.87251-Wt 0.792 0.7815 -1.326% 0.803ηo 0.682 0.6785 -0.507% 0.683ηR 1.011 0.9811 -2.955% 0.976J 0.728 0.7363 1.142% 0.733n 9.5 9.3231 -1.862% 9.62η 0.74 0.7545 1.963% 0.724

工况 35o 舵角回转

航速 2.59 m/s

最大舵角 35o

转舵速度 53.6 o/s

首次操舵方向左舷

运动轨迹舵角、首向角

横摇角横摇角速度

Shanghai Jiao Tong University 20/20 Z形操纵

运动轨迹舵角、首向角

横摇角横摇角速度

Ship self-propuslion motion in waves

Motion histories

TF3 TF5

CFD 0.9785 0.7406

EFD 1.039 0.669

Wave Run-up and impact

Shanghai Jiao Tong UniversityWave Run-up on Cylinder

Shanghai Jiao Tong University T9S110

Maxium values of wave runup

Shanghai Jiao Tong University T9S130

T9S110

Shanghai Jiao Tong UniversityWave Run-up on Fixed Platform

naoe-FOAM-SJTU

Floating body and mooring system

981 semimersible Platform Motion in Waves

naoe-FOAM-SJTU

在垂直张紧锚链作用下平台在波浪上运动

naoe-FOAM-SJTU

在斜张紧锚链作用下平台在波浪上运动

naoe-FOAM-SJTU

naoe-Foam-SJTU

naoe-FOAM-SJTU

Shanghai Jiao Tong UniversityFLNG

naoe-FOAM-SJTU

VIM for Spar

DTMB Spar

DTMB Spar VIM（Urn=8）

Wake flow pattern of vortices

Click here if above video not work

Offshore Wind Turbine Flows

Two Blades of Wind Turbine

naoe-FOAM-SJTU

V=15m/s

Three Blades of Wind Turbine

naoe-FOAM-SJTU

Three Blades

5 10 15 250

风速 [m/s]

两叶片风轮推力

三叶片风轮推力

Shanghai Jiao Tong University Downwind configuration

Upwind turbine Downwind turbine

Wind Turbine with supporting Tower

naoe-FOAM-SJTU

Wind Turbine with supporting Tower

naoe-FOAM-SJTU

Integrated our already developed meshless particle MPS codes into the naoe-FOAM-SJTU solver.

naoe-FOAM-SJTU 2.0

Shanghai Jiao Tong Universitynaoe-FOAM-SJTU 2.0

Tank Sloshing

Tank Sloshing with Baffle Plate

Ship motion in waves

Shanghai Jiao Tong University naoe-FOAM-SJTU 2.0

Particle solver (MPS

and SPH)

Shanghai Jiao Tong UniversityThank You !

naoe-FOAM-SJTU

Progress of naoe-FOAM-SJTU Solver for Ship and Ocean … · 2015-07-08 · Progress of...

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