FDS-2-Abaqus

205 Pages·2016·8.04 MB·English

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J.A.Feenstra
0726615
August 2016

FDS-2-ABAQUS: C++ MANAGED AUTOMATED PYTHON SCRIPTED CFD-FEM COUPLING

Master Thesis of J.A.Feenstra for the degree of Master of Science to be submitted to the
Department of the Built Environment at Eindhoven University of Technology.

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Project MSc. Thesis
Archive Code A-2016.161
Title FDS-2-Abaqus, C++ managed automated python scripted CFD-FEM coupling.
Additionally assessing two-way coupling effectiveness
Version 1.4 (Final)
Date August 2016

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Name J.A. (Jelmer) Feenstra
Student Number 0726615
Address Salamancapad 267
3584DX Utrecht
Mobile Number [phone]
Mail address [email protected]

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Faculty Department of the Built Environment
Master Architecture Building and Planning
Master Track Structural Design
Chair Applied Mechanics

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Chairman dr. ir. H. Hofmeyer [TU/e – Netherlands]
2nd member prof. M. Mahendran [QUT – Australia]
3rd member ir. R.A.P. van Herpen [TU/e – Netherlands]

J.A. FEENSTRA I
II MASTER THESIS
FDS-2-ABAQUS: C++ MANAGED AUTOMATED PYTHON SCRIPTED CFD-FEM COUPLING
PREFACE
Before you lies my graduation thesis for my master Structural Design at Eindhoven University of
Technology. Within this thesis a program called FDS-2-Abaqus was developed which can be used to
perform one and two-way coupled CFD-FEM analyses. FDS-2-Abaqus was used to study the
feasibility and effectiveness of a two-way coupled of CFD-FEM analysis.
In the past year I was able to develop numerous skills. Most notably my ability to read and write code.
The core process of coding is to continuously subdivide a problem until you can solve one with a simple
line of code. I think this process is widely applicable in any project. Looking back there are numerous
things that I, in retrospect, would like to do or approach differently. Actually illustrating the numerous
skills I developed over the course of this project.
This thesis would not have been a success without the support and encouragement of my environment.
Therefore I would like to thank my supervisors for their guidance throughout this project. I am very
grateful for their encouragement, explanations, and enthusiasm. It helped me keep motivated and were
vital to the successful completion of this project. Thank you Herm Hofmeyer for our in depth discussion
in which we always seemed to run out of time. Thank you Ruud van Herpen for your clear explanations
on fire. Also thanks to prof. Mahen Mahendran of Queensland University of Technology for his interest
in my project and his feedback on my writing.
In addition I would like to thank my family and friends for their support and interest throughout this
project. You guys really never seemed bored. A special shout out to my parents who have always
encouraged and supported me.
Jelmer Auke Feenstra
Utrecht, August 2016

J.A. FEENSTRA III

FDS-2-ABAQUS: C++ MANAGED AUTOMATED PYTHON SCRIPTED CFD-FEM COUPLING
ABSTRACT
Coupling of CFD fire simulations to thermo-mechanical FE models is a relative new area of research. A
distinction is made between one and two way coupling where in a two way coupled analysis the effect
of the structural response on the fire propagation is taken into account. The effect of mechanical
behaviour on the fire has only been studied in a very limited number of cases.
The aim of this thesis is to study the feasibility of the two-way coupling of CFD fire simulations to FE
heat transfer and structural response analyses. More specifically to compare the difference in failure
propagation of a thin walled steel façade subjected to fire for a one and two-way coupled analysis.
Coupled CFD-FEM fire to thermomechanical analysis can be split into three separate types of analysis
(a1) fire simulations, (a2) heat transfer analysis, and (a3) structural response analysis. These Analysis
steps and their mutual coupling steps, have been studied separately. For the fire simulation the CFD
software Fire Dynamic Simulator (FDS) by NIST is used. Both the heat transfer (HT) and the structural
response (SR) analyses are modelled using FE software Abaqus.
FDS-2-Abaqus is a managing program developed during this thesis to facilitate the one and two-way
coupling of a CFD-FEM analysis. FDS-2-Abaqus was used to perform one and two way coupled
analyses of an office space comprising a twelve plate thin walled steel façade. The results were used
to assess the effectiveness of two-way coupling. Concluding that the significant difference in failure
progression illustrates both the feasibility and the effectiveness of two-way coupling. Although
additional research, using more advanced fire and structural models, is required for an all conclusive
answer.

J.A. FEENSTRA V

FDS-2-ABAQUS: C++ MANAGED AUTOMATED PYTHON SCRIPTED CFD-FEM COUPLING
ABBREVIATIONS AND SYMBOLS
Overview of abbreviations and symbols used throughout this thesis.
ABBREVIATIONS
AAAASSSSTTTT Adiabatic Surface Temperature
CCCCFFFFDDDD Computational Fluid Dynamics
DDDDOOOOFFFF Degree of Freedom
FFFFDDDDSSSS Fire Dynamic Simulator
FFFFEEEEAAAA Finite Element Analysis
FFFFEEEEMMMM Finite Element Method
HHHHRRRRRRRR Heat Release Rate
HHHHTTTT Heat Transfer
OOOOWWWWCCCC One-Way Coupled / One-Way Coupling
SSSSRRRR Structural Response
TTTTWWWWCCCC Two-Way Coupled / Two-Way Coupling

SYMBOLS - GREEK
α Coefficient of thermal expansion [K-1]
ε Emissivity -
ε Longitudinal strain -
long
ε Transverse strain -
trans
ν Poisson’s ratio -
σ Thermal Stress [N⋅m-2]
th
σ Stefan Boltzmann Constant 5,5703⋅10−8 [W⋅m-2K-4]
boltz

SYMBOLS – LATIN
A Total fire surface [m2]
fi
A Heat transfer surface [m2]
ht
c Specific heat [J⋅kg-1K-1]
E Young’s modulus [N⋅m-2]
F View factor -
HRR Heat release rate [W⋅m-2]
f
h Convective heat transfer coefficient [W⋅m-2K-1]
c
k Thermal conductivity [W⋅m-2K-1]
∆L Elongation [m]
L Original length [m]
0
m Unit mass [kg]
Q Thermal energy [J]
Q Net heat of combustion [J]
fi
J.A. FEENSTRA VII
q Heat rate [W]
q„ Heat flux [W⋅m−2]
q Conductive heat rate [W]
cd
q Conductive heat rate [W]
cv
q Fire load density [J⋅m−2]
fi
q Radiative heat rate [W]
rad
q„ Incident radiation flux [W⋅m−2]
inc
T Absolute ambient temperature [K]
amb
T Adiabatic Surface Temperature [K]
AST
T Absolute temperature of fluid [K]
gas
T Absolute surface temperature [K]
surf
t Duration [s]
t Duration flashover phase [s]
0
t Duration fully-developed phase [s]
1
t Duration decay phase [s]
2
t Total fire duration [s]
fi

VIII MASTER THESIS