CIFRE-PhD Aeroacoustic simulation of jet-airframe interactions with Lattice-Boltzmann Method (H/F) AIRBUS

**Job Description:**
*EN*
Keen to participate in the technical challenges of future silent aircraft ?
**Airbus ****Commercial Aircraft** is looking for a *PhD** c*andidate*** in Aeroacoustic simulation of jet-airframe interactions with Lattice-Boltzmann Method* to contribute to the development of numerical aeroacoustic methods for the simulation of jet noise when installed on the airframe.
**The team:**
Located in *Airbus Commercial Aircraft* division in* Toulouse*, within the engineering Propulsion Center of Competence, the *'Data Integration & Advanced Methods' team is a multidisciplinary team.*
We are responsible for the development and deployment of advanced methodologies - including numerical simulations, modeling, and artificial intelligence - to address complex physical challenges related to propulsion systems and acoustics. Our activities are diverse, spanning from Research & Technology (R&T) to specific aircraft programs in order to support core business objectives.
**Your working environment:**
Global capital of aeronautics and European capital for space research, Toulouse is a dynamic city in the southwest of France served by an international airport. Ideally located between the Mediterranean sea and the Atlantic ocean and close to the Pyrenees mountains, it offers plenty of options for outdoor activities!
**How we care for you:**
* **Financial rewards:* * Attractive salary, agreements on success and profit sharing schemes, employee savings plan abounded by Airbus and employee stock purchase plan on a voluntary basis.
* **Work / Life Balance:* * Extra days-off for special occasions, holiday transfer option, a Staff council offering many social, cultural and sport activities and other services.
* **Wellbeing / Health:* * Complementary health insurance coverage (disability, invalidity, death). Depending on the site: health services center, concierge services, gym, carpooling application.
* **Individual development: ** Great upskilling opportunities and development prospects with unlimited access to +10.000 e-learning courses to develop your employability, certifications, expert career path, accelerated development programmes, national and international mobility.
At Airbus, we support you to work, connect and collaborate more easily and flexibly. Wherever possible, we foster flexible working arrangements to stimulate innovative thinking.
**Your mission:**
With the rise of ultra-high bypass ratio engines (BPR > 10), the boundary between 'engine' and 'airframe' is blurring. As turbofan engines move closer to the wing, the jet flow produced by the exhausts interacts more significantly with the airframe (wing and flaps) than in traditional aircraft configurations. This produces *j* *et-airframe interaction noise* . This aeroacoustic source must be better understood and modeled to enable the design of the next generation of quieter aircraft.
Numerical tools are widely used in the aerospace industry to understand flow phenomena, particularly 3D unsteady CFD for aeroacoustics. Nevertheless, traditional unsteady CFD solvers are often computationally expensive and labor-intensive, making them difficult to integrate into industrial optimization loops or to use for efficient assessment of specific phenomena. The *Lattice-Boltzmann Method* * (LBM)* has proven to be an efficient alternative to traditional solvers and a strong contender for addressing future industrial challenges, especially in aeroacoustics.
Previously limited to flows below Mach number of 0.4, recent advances have made LBM accessible for typical aeronautical flows, making it effective for studying high-subsonic flows such as those encountered in isolated and installed jet noise. However, while very promising for simple academic cases, internal studies show that LBM struggles with realistic jet configurations involving dual fluxes, high-speed, hot primary flows and flight effects. These limitations primarily stem from the modeling of the flow at the octree mesh interface, which produces numerical discrepancies in high-speed configurations.
In the frame of the present PhD thesis, *You will develop and improve * numerical tools based on the LBM to predict the noise emitted by engine jets installed under high lifted wings. More specifically, *You will enhance* the maturity of the transitions algorithm at octree mesh interfaces in a realistic environment in terms of both geometric complexity and physical complexity (high Reynolds number flows). *You will develop yourself in an international context* in the frame of aircraft development.
Your academic supervision will be ensured with the CERFACS, a reference research center on LBM in Toulouse.
If these new opportunities and challenges are what you are looking for, we are ready to support you all along your integration !
**Your challenges :**
Your main tasks and responsibilities may include :
*1. Academic Axis *
This axis focuses on the ability of the *LBM approach* to achieve the required accuracy for reliable aeroacoustic calculations. Specifically, you will work to improve the accuracy of algorithms handling *non-conformal (non-coincident) mesh interfaces* within environments of high geometric and physical complexity (high Mach and high Reynolds numbers) in a *compressible regime* .
The work will be structured as follows:
* *Identify the dominant factors* in spurious noise emissions in the frame of jet aeroacoustics.
* *Evaluate the trade-offs* between cell-centered and vertex-centered algorithms.
* *Adapt the 'Direct Coupling' mesh refinement algorithm* to new compressible models (energy-conservative or entropy-based).
* *Identify levers, develop, and assess new algorithms* to improve mesh interface accuracy within the framework of jet aeroacoustics.
* As an overarching challenge, focus on the *numerical stability and spectral accuracy* of LBM schemes in the high-speed compressible regime
*2. Operational/Application Axis *
This second axis focuses on the gradual validation of the LBM approach across cases of increasing complexity (both geometric and physical). Validation steps include:
* *Academic Jets:* Simple round jets, accounting for Mach and temperature effects.
* *Jets with Co-flow:* Simulating flight speed through external airflow moving in the same direction as the jet, for isolated single- and dual-stream jet configurations.
* *Wing & Flap Installation*: Investigating the primary sources of interaction noise caused by turbulent jet motion passing under solid surfaces or distorting at trailing edges.
Of course, your job requires an awareness of any potential compliance risks and a commitment to act with integrity, as the foundation for the Company's success, reputation and sustainable growth.
**Your boarding pass :**
We are looking for candidates with the following skills and experience :
* *Engineer, Masters degree in aero-acoustics or fluid mechanics*
* Good knowledge and practice of *unsteady aeroacoustic CFD simulation methods*
* Very good knowledge and practice of *numerical methods and turbulence modelling*
* Good knowledge of *scientific programming languages, such as Python, C++*
A plus would be to have knowledge / experience in:
* pre- and post-processing tools for unsteady CFD simulation for acoustics (Tecplot, Paraview)
* Acoustics theory and methods
Soft skills required:
- Very good ability in human relationship
- Customer oriented mindset
- Curiosity & Autonomy & Collaborative mindset with various research partners
- Advanced level in English
Not a 100% match? No worries! Airbus supports your personal growth with customized development solutions.
Take your career to a new level and apply online now !
--------------------------------------------------
*FR*
Vous souhaitez participer aux défis techniques des futurs avions silencieux ?
*Airbus * *Commercial Aircraft* recherche* un(e) candidat(e) de thèse* *CIFRE* *en Simulation Aeroacoustique de l'interaction jet-voilure avec la méthode Lattice-Boltzmann * pour contribuer au développement de méthodes aéroacoustiques numériques pour la simulation du bruit jet installé sous voilure.
*L'équipe :*
Au sein de la division Airbus Commercial Aircraft à Toulouse et du Centre de Compétences Propulsion, l'équipe *'Data…