Javier Sierra-Ausin bio photo

Javier Sierra-Ausin

PostDoc researcher (IMFT), Toulouse-France, Fluid Dynamics and plasma propulsion

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Curriculum Vitae


About me

Overview

My name is Javier Sierra-Ausin. I am research scientist in fluid dynamics.
My research focuses on fundamental aspects of hydrodynamic instabilities and nonlinear dynamics applied to multi-physics and multiscale problems, which are mostly studied by means of computational and theoretical approaches.
Why multi-physics?

I study problems in fluid mechanics with a fluid (incompressible or compressible) interacting with a solid body (rigid or deformable), or with a second phase, which is not necessarily another classical fluid, it may be for instance, a plasma (so far only a cold-plasma).
Why multiscale?

My collaborators and I, we study problems involving many distinct physical scales, and we employ either fine mesh adaptation techniques to efficiently characterise the physics, or asymptotic models to characterise the small scales.

Some more info about me:
I am currently a post-doc scientist involved in the ANR project PROPULS-ION under the supervision of Franck Plorabué.
Before that, I did my PhD (cotutelle-thesis) at the IMFT and UNISA , under supervision of David Fabre, and Flavio Giannetti. In my dissertation – titled Mode interactions in external flows – One of the aims is the determination of the universal features in the laminar-chaotic transition by means of bifurcation theory. What do I mean by universal features in the laminar-chaotic transition ? It denotes the spatio-temporal symmetry-breaking path followed by the system in the parametric space towards chaotic dynamics. In particular, here I focus on the existence of organising centres of the parametric space, i.e., bifurcations of codimension equal to the number of parametres of the problem, which serve to classify the dynamics near the onset of instability. We analyse these features in several configurations, incompressible flows, mixed-convection, compressible flows, fluid-structure interaction and flows with bubbles.

Already quite a while ago, I started my journey in academia studying aerospace engineering and mathematics.

News

  • October 2, 2023 – Presentation by Corentin Marion at ISNPEDADM-2023 about the Wake flow transition behind a symmetric airfoil under the effect of a corona field in La Rochelle.

  • June 30, 2023 – Presentation The identification of the instability core of instabilities underpinned by an acoustic-hydrodynamic feedback at ERCOFTAC-SIG 33 – Transition and control in Alghero.

  • June 8, 2023 – Presentation by Théo Mouyen about Stability prediction of multiple freely-oscillating bodies at ERCOFTAC Symposium on Multiphysics critical flow dynamics involving moving/ deformable structures with design applications in Toulouse.

  • May 1, 2023 – Start as a PostDoc in ANR Propouls-ion project.

  • April 26, 2023 – Defense of my thesis!

Highlighted publications