A post-doctoral position in Computational Fluid Dynamics is available at the 
University of Louvain (UCLouvain) in Belgium. The topic concerns turbulent 
convection at open-top  reservoirs with phase change (evaporation across the 
free surface  and boiling). Relevant applications include thermal power plants, 
refrigeration systems, water and fuel tanks, boilers, spent fuel pools of 
nuclear power  stations and others.  

The specific objectives of the proposed research are the following.
1)  Development of appropriate mathematical models that collectively describe 
all hydrodynamic and transport phenomena ocurring below and above the free surface.
2)  Development of algorithms and implementation of related software.
3)  Performance of numerical simulations, via high-performance computing.
4)  Calculation of phase-change rates for a variety of configurations.

Particular emphasis will be given in the modelling and simulation of:  
•  turbulent convection inside the water pool at high Rayleigh numbers,
•  evaporation across the free surface,
•  motion and descent of the free surface, 
•  nucleation and boiling at solid boundaries.

The starting date can be as early as September 20 2020, and no later than 
November 1st 2020. The initial duration of the appointment is for 12 months, 
renewable twice for a period of 12 months each. Therefore, the overall duration 
can be up to 36 months. 

The postdoctoral fellow will join the Multi-phase and Reacting Flows group of 
the University of Louvain. Information about our group's activities is available 
on our website, https://sites.google.com/site/mvpapalexandris/

The postdoctoral fellowship includes the fellow’s salary, full insurance and 
health benefits, public-transportation cost and coverage of expenses for 
participation in conferences & workshops.

Required qualifications and skills:
- a PhD degree in the thematic area of modelling and simulation of turbulent 
flows. Background and expertise in two-phase flows is highly desirable.
- good programming skills (in C/C++ or Fortran),
- strong mathematical background,
- ability to efficiently communicate, read and write in English.

Interested applicants are invited to submit: 
i)    detailed CV, 
ii)   transcripts of academic records (grades),
iii)  a statement of research interests, and 
iv)   names of 2 references to Prof. M. Papalexandris, miltiadis.papalexandris@uclouvain.be

The International Max Planck Research School on Earth System Modelling (IMPRS-ESM), located in Hamburg, Germany, offers fellowships to outstanding students interested in interdisciplinary climate research. Our doctoral candidates contribute to the understanding of the Earth system through the application, evaluation and development of a spectrum of Earth system models at different levels of complexity and at various spatial and temporal scales. Emphasizing the physical system, the School encompasses the broader field of Earth sciences, including economics and social sciences. The IMPRS-ESM strives to attract a diversity of talented women and men from all nationalities to research in the Earth system sciences.

The PhD program is open to applicants holding a Master’s degree (with written thesis) in physics, geophysical sciences (incl. meteorology and oceanography), ecology, mathematics, computer science, engineering, economics, or political science. Also students currently still working on their MSc thesis are encouraged to apply.

Please apply online through our website until 15 September 2020. The selection procedure includes an interview (probably end of November 2020). Doctoral candidates receive financial support of about 1,775 Euros/month for a period of three years. There are no tuition fees but a semester fee is charged by the university. Funding will be available starting March 2021.

For questions, please contact: office.imprs@mpimet.mpg.de 


Internet: imprs-esm.mpimet.mpg.de

Computational Fluid Dynamics (CFD) modeling of trans- and super-critical
multicomponent flows

Trans- and supercritical conditions are often found in recent designs of 
direct injection engines, rocket engines and gas turbines for jet propulsion 
at take-off.
More efficient and cleaner combustion technologies can be achieved increasing 
the operating pressure of the combustion chamber, leading to trans-critical 
trajectories of the injected liquid fuel. Detailed understanding of real-
fluid flows under these operating conditions is crucial. With the increase of 
liquid bio- and synthetic fuels for aviation and transportation, further 
challenges are encountered in the engineering design of reliable and low-
emission combustors. Recent computational studies have clearly shown the link 
between the injector flow and the mixing and auto-ignition occurring under 
these conditions, but numerical challenges  and real-device complexities 
still pose challenges to full model predictivity.

Despite its engineering importance, multi-component real-fluid spray in hot 
turbulent flows has not been explored thoroughly, yet and the scientific 
community lacks detailed understanding of the non-linear physics. The reason 
lies in the complex transitioning thermodynamics and in the multi-scale and 
multi-physic nature of the problem.

At the realistic physical scale of combustion chambers, accurate description 
of the early phase of the dense spray break-up and atomization for multi-
component fuels is especially important, but first-principle prediction of 
such complex phenomena is a challenging task. Two main classes of Eulerian 
methods exist.
On one hand, sharp interface methods, like level-set (LS) and volume-of-fluid 
(VOF) methods, can be used in the subcritical regime for directly resolving 
the interface mechanics [12-14], but these methods are computationally 
demanding as the interface features may be extremely small. On the other 
hand, diffuse-interface models, based on two-fluid or single-fluid 
formulations [1-7,15,16], are less computational demanding and can be applied 
to large scale spray or combustion chamber design, but research is needed for 
accurate closure models of sub-grid effects. 

Our recent work has already investigated the possibility of introducing real-
fluid properties in to single-fluid Eulerian models. 

In this PhD project, in order to enhance the prediction capabilities in high-
pressure high-temperature multi-component two-phase regions, we plan to 
explore and compare multiple paths, by developing new solvers in OpenFOAM 
for:
-	Single-fluid model description, 
-	Two-fluid model, where two phases are directly transported,
with the addition of a transport equation for the interfacial area density, 
which will allow to calculate the local level of atomization, like 
droplet/ligament size, and which will vanish at supercritical condition.  
Each approach will combine real-fluid thermodynamics properties. These models 
can be naturally and seamlessly coupled to already exiting combustion models, 
then enabling the unified simulation of two-phase and reactive flow cases.
These approaches represent the first attempt in the literature to couple the 
surface area density with the flow variables, in the context of real-fluid 
thermophysical models.
Ultimately, these solvers will be applied to the study of novel fuel 
injection conditions, novel high-efficiency engines, and renewable e-fuel 
injection and combustion.

-------------------------------------------------------------------------
Short description and objectives of the research activity:	

The research aims to develop a new two-phase flow solvers for fuel sprays 
with specific focus on high pressure and high temperature conditions, and 
multicomponent thermodynamics. The code will be developed in OpenFOAM and 
will be able to describe in Eulerian form the processes of primary 
atomization and mixing in subcritical and supercritical conditions.

-------------------------------------------------------------------------
Desired skills:

The project is within the area of CFD Modeling of Fuel Sprays and Combustion. 
The candidate is expected to have good knowledge of 
-	CFD modeling and numerics, 
-	C/C++ programming, 
-	python/matlab scripting is a plus.
The successful candidate will perform large-eddy simulations (LES) of two-
phase flows using high-performance computing (HPC) resources; he will also 
incorporate state-of-the-art experimental measurements to improve the 
accuracy of the models. Eventually, the candidate will write peer-reviewed 
journal articles, and present the results of the work at international 
conferences and events.

THIS STUDENTSHIP OPPORTUNITY HAD PREVIOUSLY BEEN PUT ON HOLD DUE TO THE COVID 19 
PANDEMIC. IT HAS NOW BEEN RE-ACTIVATED AND THE POSITION IS STILL AVAILABLE.

Improving Heat Transfer Performance through Advanced Simulation Methods

With climate change continuing to drive global emissions reduction targets, it
is increasingly important to maximise energy efficiency.  Rotary regenerative
heat exchangers are the most efficient and compact method for gas to gas heat
transfer and are becoming more widely used in diverse energy intensive
processes involving waste heat.

The two considerations of emissions abatement and increased efficiency underpin
the objectives of this project, which specifically relates to the design of
heat transfer elements for use in Rotary Regenerative Heat Exchangers
(heaters).  These elements consist of thin plates, usually in pairs, with a
geometry designed to induce turbulence and hence heat transfer between the
metal and gas flowing through the heater.  Assessing the thermal and pressure
drop performance characteristics of heat transfer elements currently requires
the element profile to be manufactured and physically tested on an existing
bespoke wind tunnel type test rig.

The aim of this study is to develop high fidelity models, using the most
advanced available Computational Fluid Dynamics (CFD) tools, for simulating the
complex flow within heater element packs. These models will be used, firstly,
to gain a better understanding of the impact of detailed turbulent flow
structures on both heat transfer and pressure drop characteristics of known
element types.  This work will be validated by comparing the results from CFD
to empirical data obtained from the test rig. 

Secondly, with improved knowledge of the major influences on element
performance, a more efficient approach to element development will be
possible.  The aim will be to achieve substantial cost and time savings
associated with manufacturing elements for testing.  This phase of the project
will involve developing simulation tools to undertake a parametric study of
configurational changes in conjunction with optimisation strategies to produce
improvements in current element performance. 

This project will provide an excellent opportunity to combine numerical
simulation with real world industrial testing, through working in partnership
with a highly respected engineering company and with the potential for future
career development within industry or academia. The company is headquartered in
Glasgow and over 165 years it has grown to become a worldwide organisation,
with over 6,000 employees in 26 countries.  

The project will be managed by Dr Marco Vezza, a Senior Lecturer in the
Division of Aerospace Sciences at the University of Glasgow. Access to CFD
software on high performance computing facilities is available both within the
University and through a local academic partnership to shared HPC facilities.
The University of Glasgow was founded in 1451 and is the fourth oldest in the
UK.  It is a member of the Russell Group of world class universities with a
shared focus on research and a reputation for academic achievement.

For an informal discussion or for further information on this project,
potential applicants are encouraged to contact Dr Marco Vezza. 

Note that this project has funding attached for UK and EU students, although
the amount may depend on your nationality.  Non-EU students may still be able
to apply for the project provided they can find separate funding.  You should
contact Dr Vezza for more information re eligibility.

Post doctoral fellowhip :

"Numerical and experimental multi-scale flow modeling for thermal and air 
quality applications"

Research Center : ENERGY AND ENVIRONNEMENT

Affiliation : Ecole Nationale Supérieure Mines-Télécom Lille Douai (IMT Lille 
Douai)


Context :

Created by the merger of Mines Douai and Telecom Lille on January 1st, 2017, 
IMT Lille Douai is the largest graduate school of engineering in the north of 
Paris. It aims at teaching the general engineers and digital experts of the 
future. Located at the crossroads of Europe, between Paris, London, Brussels 
and Amsterdam, IMT Lille Douai intends to become a major player in industrial 
and digital transformation of the society by combining engineering science and 
digital technologies. Based on two sites dedicated to research and education in 
Douai and Lille, IMT Lille Douai has research facilities of almost 20,000m² 
devoted to high-level scientific activities in the following areas:
- Digital science,
- Energy and Environment,
- Materials and Process engineering applied to polymers, composites and civil 
engineering.


Scientific project :

     The ECOPECCH project (flow/particle interaction for particle sensors and 
heat exchangers efficiencies) was proposed recently to study the particle 
transport and deposition phenomena for two types of applications: the embedded 
particle sensors and the heat exchangers.

- The embedded particle sensors are used to identify and to realize “real-time” 
air quality monitoring and is a helpful tool for political decision to decrease 
the impact of automotive traffic. This device is basically used on-top of 
vehicle to capture the representativeness of air pollution across a city.
Recent studies showed that the pollution representativeness measured from 
particle sensors is influenced from the vehicle’s velocity: the higher the 
velocity, the lower the representativeness.

- The heat exchangers are widely used in energy systems (automotive, nuclear, 
buildings, etc.) for heat transfer between two fluids. Fouling is one of the 
major problems that one must cope to maintain heat exchanger’s efficiency and 
durability. This phenomenon occurs when particles inside fluids deposit on the 
exchange surface which can significantly decrease the heat transfer. To 
overcome this complex phenomenon, the heat exchangers are usually oversized. 
Overall analysis of heat exchanger’s fouling can be found in the literature, 
but the local mechanism such as sweeps and ejections phenomena are not yet 
understood in such complex and confined systems like fins-andtubes heat 
exchangers for instance. A better optimized design could lead to lower fouling 
and compact systems with higher energy efficiency.

The goal of the ECOPECCH project is to develop both numerical and experimental 
tools which enable 1) to analyze the impact of flow regimes on the particles 
sensors detection leading to new sensor design optimization and 2) to predict 
both globally and locally the particle transport inside and through the heat 
exchanger.

     The ITAQ project (Thermal-Aeraulic Interaction and Indoor Air Quality) was 
developed in the CERI EE to globally and locally analyze both experimentally 
and numerically the combination of different factors in indoor environment that 
can have a major influence on air quality such as thermal, flow effects and 
materials which are the main sources of pollution. One of the goals of this 
project is to equip a real-scale low consumption building with thermal, 
aeraulic sensors and air pollution analyzers.


Objectives :

This position has two main objectives:

1- The first objective is to design a new experimental aeraulic bench adapted 
for flow-analysis around sensors and fouling identification for heat exchangers 
(ECOPECCH project). This bench must include local flow measurements and 
particle tracking techniques (S-PIV, LDA, PDA), enables the injection of 
pollutants (particles and gas), and must be adapted to set different size of
heat exchangers. This task includes 1) the design and the dimensioning of the 
bench using both CFD and CAD softwares, 2) the supervising of the bench set-up 
with the help of the CERI EE engineers and technicians, 3) An accurate control 
on flow properties, such as velocity profile, turbulence level and 4) the first 
measurement campaign on sensors and/or heat exchangers fouling, depending on 
the candidate profile. A publication is expected and/or a detailed report on
a methodology used for test bench.

2- The second objective is to perform experimental long-time monitoring in real 
conditions inside the low-consumption equipped building including temperature, 
flow, humidity, and pollution (COV) time-monitoring. This study is expected to 
be presented at scientific meetings and be published in impact journals. The 
researcher will also be expected to participate in teaching activities 
according to his/her background.


Candidate profile, personal skills, and requirements :
The candidate should hold a PhD degree in fluid mechanics (experimental and/or 
numerical). A true expertise in CFD is required. The candidate must possess a 
good working knowledge of Solidworks CAD software. Experimental background in 
one of the following fields will be gratefully appreciated: particle and/or gas 
dispersion, turbulence, heat transfer, air quality, design optimization. An
experience in the setting-up of test bench is a plus.

The candidate will send resume, motivation letter, recommendation letter, PhD 
diploma, and other documents which might be important to analyze the 
candidate’s profile, to the following email address:

remi.gautier@imt-lille-douai.fr


Further informations:
- Full-time postdoctoral position
- Duration: 12 months
- Starting date: from September 1st 2020 to December 1st 2020

The post-doc will develop and evaluate numerical methods for cavitation modelling 
in hydropower for a renewable electric energy system, combining experience in 
cavitation at the division of Marine Technology and in hydropower at the division 
of Fluid dynamics, within the department of Mechanics and Maritime Sciences at 
Chalmers. The research involves determining the conditions under which cavitation 
will occur and affect the turbine, and then develop suitable high-fidelity CFD 
models and analyse the impact of cavitation on the performance and dynamics. The 
methods developed and studies performed thus need to consider multiphase 
turbulent flows, possibly involving compressible effects, in a running 
hydroturbine.

The project further connects the research performed in the two research centres, 
SVC (Svenskt Vattenkraft Centrum), supporting the Swedish hydropower industry, 
and the Kongsberg UTC (University Technology Centre) in computational 
hydrodynamics, supporting the marine propulsion sector within Kongsberg.

Please read the full announcement at:

https://www.chalmers.se/en/about-chalmers/Working-at-
Chalmers/Vacancies/Pages/default.aspx?rmpage=job&rmjob=8715&rmlang=UK

Type of positions: research fellow type I & II (特聘研究员/特聘副研究员), 
postdoctoral fellow 
(博士后)，Phd studentship.

Research area:  Experimental and/or computational and/or theoretical fluid 
mechanics 
related to turbulent flows, droplet/particle interaction with turbulence, 
microphysics of 
turbulent atmospheric cloud, atmospheric turbulence.

Brief introduction: Fluid turbulence is often quoted as the last unsolved problem 
in classical 
physics, a statement usually associated with R.P. Feynman (Nobel prize in 
Physics). 
Turbulent flows and interaction between turbulence and particle/droplets is at the 
heart of 
many processes in nature such as in the atmosphere (clouds, pollutants motion, 
weather-
climate feedback etc.) and many engineering processes such as inside combustion 
engines, chemical and food processing, aircraft flights etc. However fundamental 
understanding of these subject is challenging and represents the forefront of 
scientific 
inquiry, owing to the non-linear and complex nature of these problems. Our lab 
aims at 
better understanding turbulence and particle-turbulence interaction (with emphasis 
in 
either atmospheric or engineering processes) using cutting-edge experimental 
and/or 
computational methods and theoretical considerations. 
Sample projects: observing droplet/particle motion and collisions in turbulence 
chamber 
via cutting-edge experiments or numerical simulation (e.g. using the Tianhe-2 
supercomputer); high precision numerical simulation and fundamental analysis of 
turbulent 
flows, with or without particles (DNS, LES etc.); designing and/or conducting 
wind-tunnel 
experiments to study various turbulence, atmospheric boundary layer problems (or 
via 
simulation); developing/conducting field experiments to observe particle/droplet 
dynamics in 
atmospheric clouds(e.g. using Helium-ballon or drones) etc. Candidates are 
welcomed to 
discussed his own ideas for projects (we have wide interest in the general field 
of physics, 
fluid dynamics, turbulence, atmospheric science).

About the institution: Sun Yat-Sen University is among the top-ten universities in 
China and 
is included in the ambitious national initiative by the Chinese Government to 
create a rank 
of “first class” universities by international standard. The position will be at 
the School of 
Atmospheric Science in the beautiful coastal Zhuhai campus. The School is a focal 
point of 
the current phase of development of SYSU and thus continuously receives generous 
investments. The city of Zhuhai, next to Macau and Hong Kong, is a top tourist 
destination 
in China thanks to its coastline and “balanced” development.

About the research advisor: Ewe-Wei Saw, Thousand-Young Talent professor at the 
School 
of Atmospheric Science, Sun Yat-Sen University (Zhuhai), obtained his Phd. in 
Physics from 
Michigan Tech. University (USA), Bac. in Physics from University of Malaya. He 
previously 
visited/worked at research institutes such as Cornell University (USA), Max Planck 
Institute in 
Germany and Commission of Atomic Energy (CEA), Observatoire de La Cote d’Azur in 
France. 
Dr. Saw research interest pertains to Fluid Dynamics of Turbulent Flows, 
Droplet/particle 
Dynamics in turbulent flows and Cloud Microphysics. He has published research 
articles 
scientific journals such as Nature-communications, Physical Review Letters, BAMS 
etc. Dr. 
Saw is a fluent speaker in English and non-technical Mandarin and have a flexible 
working 
style influenced by European/American characteristics.

Requirements:

- Candidate’s background: Mechanics/mechanical engineering, Physics, Atmospheric 
science, Computational Science/engineering, or closely related areas. Candidates 
with strong 
background in building/conducting experiments and/or programming skills (Python, 
Fortran 
etc.) are encouraged to apply. Doctoral degree is required for application of 
research/postdoc 
fellow. For computationally inclined applicants, prior experience with numerical 
simulations of 
turbulence such as DNS, LES, or Lattice Boltzmann^  and/or parallel computation 
would be 
highly desired. Candidates with interest to be somewhat involved with experimental 
work will 
be given some priority.

- Successful candidates should be a proactive, responsible person, able to work 
independently, with keen interest in scientific research and/or academic success.  
Candidates should have decent communication and writing skills in English. 
Knowledge of 
Mandarin might be helpful.

^We do not have prior experience with LB simulation, but is a new direction we 
will be 
interested to explore together with any experienced candidates. 

Remunerations:
(Age limit may apply to each program)

Research fellow type I: Competitive annual salary RMB 220-260,000+, social 
security coverage^. 3 years contract with possibility of extension. Details: 
http://www.sysu.edu.cn/2012/en/jobs/jobs05/index.htm .

Research fellow type II: Competitive annual salary RMB 160-200,000**+, social 
security coverage^. 3 years contract with possibility of extension. Details: 
http://www.sysu.edu.cn/2012/en/jobs/jobs05/index.htm .

Postdoctoral fellow: competitive annual income (up to about RMB 340,000 for holder 
of 
PhD from top-200 university worldwide [THE ranking] obtained within the last 2 
years^); 
otherwise about RMB 240,000 + housing/food subsidy +**, with possibilities to 
apply for 
various governmental incentive programs), social security coverage^. 3 years 
contract with 
possibility of extension as fellows. Subsidized rental housing will be provided.

^Applicant with prestigious background but come short of satisfying these 
requirements 
may still qualify for other (intermediate) salary boost package. 

**Additional bonus  (possibly up to ~50K/year, depending on performance 
and funding situation).  

^Coverage system changes based on nationality.

Research assistant: please enquire.

Contacts: For enquiries and to apply, please used the website's tool or email (in 
English or 
Mandarin) to ewsaw3##gmail[dot]com (change ## to @, [dot] to "."). For application 
of 
research fellow and postdoc, please submit a short cover letter (describe 
background, 
interest etc.) and a CV (specify current age and citizenship).

Deadline: continuously hiring...

Three postdoctoral positions are available at the State key Laborotory of 
Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences in the 
following three areas:
(1) numerical methods for two-fluid turbulence with complex interface 
geometries
(2) large-eddy simulation of turbulence acoustics
(3) foundamental research on wall-bounded turbulence

Applicants should hold a PhD degree (received within 3 years) in mechanical 
engineering, civil engineering, applied mathematics, computer sciences or 
related 
fields. A strong background in computational fluid dynamics (CFD) and large-
eddy 
simulation (LES) is preferred, including experience in parallel computing and 
CFD/LES code development using C/C++/Fortran . 

Interested applicants please submit your CV, a copy of PhD degree certificate, 
a 
copy of PhD thesis, copies of no more than three representative publications to 
my 
email: yangzx@imech.ac.cn

The annual salary is in the range of 200,000 CNY to 350,000 CNY based on your 
research experience.

My client is a major engineering consultancy based in central London, who help 
design and deliver high profile engineering projects both internationally and 
in 
the UK.  The CFD/Building Physics team provide specialist expertise on many of 
these projects, recently including work on the Rio Olympics, the Houses of 
Parliament and World Cup stadia.  Through cutting-edge use of the latest CFD 
techniques and HPC technology, the team are expanding their capacity in helping 
architects and engineers create sustainable buildings, and are seeking a 
talented graduate, PhD Engineer or current engineer with 0-2 years experience 
with a background in CFD and strong 
problem 
solving skills to help drive this growth.  

As a graduate in our team, some of the areas you will work on include (but are 
not limited to):
- pedestrian comfort
- pollution dispersal
- water flow modelling (dam spillways, etc.)
- HVAC performance
- data centre roof plant recirculation analysis
- tunnel ventilation
- solar gain / stack effect / natural ventilation modelling
- evaporative modelling
- aircraft wake protection
- complex parametric geometries

Strong knowledge in OpenFOAM is 
mandatory, while knowledge of CFX is considered advantageous.

Right to work in UK is required.

Please send CVs to circlelinerecruitment@gmail.com

In October 2020, a new research group will be established by Dr. Yoram Kozak 
at the School of Mechanical Engineering, Tel-Aviv University, Israel. The 
research will be focused on the fields of Combustion and Computational Fluid 
Dynamics (CFD). 

See the following website for examples: www.kozakyoram.com

A full-time two-year Postdoctoral Researcher position is available. The 
research will include development of innovative numerical methods for multi-
phase reacting flows. 

Required Qualifications

• A Ph.D. in Mechanical Engineering, Aerospace Engineering, Chemical 
Engineering, or any other relevant field. 
• Background in Computational Fluid Dynamics (CFD). 
• Basic programming skills. 

Interested candidates should send their CV and a detailed cover letter to: 
yoram.kozak@gmail.com