Pause
Lecture
En poursuivant votre navigation, vous acceptez l’utilisation de cookies à des fins d’authentification et d’ajout de favoris. En savoir plus
Moteur de recherche d'offres d'emploi IFP ENERGIES NOUVELLES

Post-doct / VScientifique H/F


Détail de l'offre

Informations générales

Référence

2020-292  

Attributs du poste

Intitulé du poste

Post-doct / VScientifique H/F

Statut

Post-Doc

Contrat

Contrat Post-Doctorant

Si CDD (durée exprimée en mois)

12

Temps de travail

Temps plein

Lieu d'exercice

Solaize

Localisation du poste

Lieu d'exercice

Solaize

Description du poste

Contexte

Gas-liquid dispersed flows through a straight pipe have been largely studied for many decades, especially for application in the nuclear and chemical industries. The interaction between the two phases was found to involve inertial forces as well as contact forces, such as drag and lift forces, virtual mass force or turbulence-induced forces, especially when the gas-liquid mixture is dense (Delhaye 2014).

For a complex geometry rotating around a fixed axis, the usual force balance is deeply modified, with a strong impact on the particle motion. The four additional forces appearing in such a case are :

- the force due to the channel radial curvature;

- the force due to the channel axial curvature;

- the centrifugal force;

- the Coriolis force.

As part of the IFPEN project “FoReCaSt” (Multi-physics modelling of coupled phenomena), we propose to study this new force equilibrium. The post-doctoral researcher will work toward modelling and predicting the motion of a single particle, flowing with liquid through a rotating helico-semi-radial channel. This work will ultimately be used to quantify potential gas accumulation areas in the channel.

Mission(s) principale(s) et activités

Based on IFPEN previous work and publications from literature (e.g. Auton et al., 1988), the post-doctoral researcher will describe the forces acting on a single particle in a liquid flow through a rotating double-curvature channel. He will then apply the Euler-Lagrange method to the Crocco’s equation usually used in a turbomachine.

 


The problem can be split along the meridional and the cylindrical surface. The researcher will suggest a processing method to solve the projected equation along a mean curvilinear line on each surface through the channel. Using a C++ code he will assess each force magnitude and the forces balance along the curves. He will compare his results with the literature (e. g. Minemura and Al, 2011, Zhu and Zhang, 2016). The many length scales appearing in the problem require a rigorous understanding of liquid-particle interactions.

 


Then, the researcher will extend the method to a 2x2D approach, taking the two surfaces into account. This makes the equations more tightly coupled. His work will enable to predict the particle motion on each surface. Once the code validated with simple cases, he will propose and perform tests aiming at studying the impact of main parameters: particle density, diameter, channel rotational speed, curvatures radius or phase velocities. Finally he will extend his work to a set of particles (Brennen, 2005), and will build meta-models to facilitate the further use of the parametric study results.

Critères candidat

Langues

Anglais (Courant)

Diplôme(s), niveau d'études

PhD degree in fluid mechanics or applied mathematics, computer science, physics, or equivalent.

Expérience(s) professionnelle(s) souhaitée(s) (nature, durée, précisez si débutant accepté)

Knowledge of computational fluid dynamics is an advantage.

Compétences techniques et aptitudes

Technical Skills: two-phase flow, modelling, C++, fluid mechanics.

Motivation and openness are essential requirements in addition to technical skills.

Information publication

Accessible aux personnes porteuses d'un handicap :

Oui