Post-Doctoral Research Visit F/M Reduced models for cardiac valve dynamics
il y a 2 semaines
Contexte et atouts du poste
Every year Inria International Relations Department has a few postdoctoral positions in order to support Inria international collaborations. The postdoctoral contract will have a duration of 12 to 24 months. The default start date is November 1st, 2024 and not later than January, 1st 2025. The postdoctoral fellow will be recruited by one of the Inria Centres in France but it is recommended that the time is shared between France and the partner’s country (please note that the postdoctoral fellow has to start his/her contract being in France and that the visits have to respect Inria rules for missions)
Mission confiée
Candidates for postdoctoral positions are recruited after the end of their Ph.D. or after a first post-doctoral period: for the candidates who obtained their PhD in the Northern hemisphere, the date of the Ph.D. defense shall be later than September 1, 2022; in the Southern hemisphere, later than April 1, 2022. In order to encourage mobility, the postdoctoral position must take place in a scientific environment that is truly different from the one of the Ph.D. (and, if applicable, from the position held since the Ph.D.); particular attention is thus paid to French or international candidates who obtained their doctorate abroad.
Principales activités
1. Context
The heart is a double pump whose purpose is to deliver blood to the tissue and organs of the body. This function is made possible through the opening and closing of the heart valves. Cardiac diseases generally manifest by affecting the pumping function of the heart. Numerical simulations of cardiac hemodynamics, in normal and pathological conditions, are recognized as a tool of paramount importance for improving the understanding, diagnosis and treatment of cardiac pathologies, and also for the development of implantable devices due, in particular, to the fact that numerical simulations provide local information (such as pressure and stresses) which cannot be accessed via measurement techniques.
The numerical simulation of cardiac hemodynamics presents many difficulties. We can mention, for instance, the large deformation of the cardiac chambers and the complex fluid-structure interaction (FSI) phenomena between blood, the valves and the myocardium. Heart valves are definitely a bottleneck of the problem, particularly due to their fast dynamics and the contact phenomena at high pressure-drops. In order to mitigate the computational complexity of multi-physic problem, several reduced modeling approaches have been proposed in the literature. Basically, the idea consists in combining a kinematic uncoupling between blood flow and myocardium electro-mechanics (i.e., displacements, either measured or coming from numerical simulations, are enforced on the boundaries of the fluid cavities) with a reduced modeling of the valve dynamics. These formulations enable the simulation of blood flow patterns within the cardiac cavities at a reduced computational cost, but the reduced model of the valves are generally based on discrete algorithms, without a rigorous formulation of the underlying mathematical model.
2. Research program
The proposed research activity aims at developing and analyzing efficient numerical methods for the alternative mathematically sound reduced valve modelling approach, based on a constrained velocity formulation of the fluid problem with a penalty formulation. To this purpose, numerical methods based on Lagrange multipliers or on Nitsche-type techniques will be explored in the framework of an interface problem for incompressible viscous flow.
Numerical simulations will be performed in academic examples and realistic geometries of the heart. The computer implementations will be performed withing FreeFem++ and the FELiScE finite element libraries.
3. Framework
The selected candidate will join COMMEDIA project-team and work in the framework of the IMFIBIO Associated Team (Inria-UCL). Besides the natural collaboration with the UCL partner (Erik Burman), the post-doctoral activity will also involve a collaboration with Alexandre Ern (SERENA project- team).
The post-doctoral fellow will visit the UK partner, at least, 2 months per year (1 month per semester).
4. Deadline for applications
June 1st, 2024.
Compétences
Candidates must hold a doctorate in applied mathematics and have some experience in the following fields: mathematical modeling, mathematical anlaysis, numericaly anlaysis, discretization of PDEs, finite element methods.
Technical Skills: C++ programming.
Languages: English
Interpersonal skills: ability to work in a team
Avantages
Subsidized meals Partial reimbursement of public transport costs Leave: 7 weeks of annual leave + 10 extra days off due to RTT (statutory reduction in working hours) + possibility of exceptional leave (sick children, moving home, etc.) Possibility of teleworking and flexible organization of working hours (after 12 months of employment) Professional equipment available (videoconferencing, loan of computer equipment, etc.) Social, cultural and sports events and activities Access to vocational training Social security coverage-
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