We continue our seminars serie, on Friday, February 6th, 12:30 H.
On site: Salón de Grados
For this event in the Aerospace PhD Seminar Series, we will have the pleasure of hosting Dr. Alejandro Álvarez Laguna, researcher at the French National Centre for Scientific Research (CNRS) working at the Laboratoire de Physique des Plasmas (Paris, France).
The event will take place in the Salón de Grados on Friday, February 6th at 12:30 H and it will be streamed online.
Dr. Alvarez Laguna is a researcher at the French National Centre for Scientific Research (CNRS) working at the Laboratoire de Physique des Plasmas (Paris, France). His expertise lies in the numerical study and modeling of reacting plasmas in the presence of magnetic fields. He has a PhD Degree in Applied Mathematics from KU Leuven (Belgium), obtained in collaboration with NASA (USA) and the von Karman Institute (Belgium). Before, he obtained a Master of Research in Fluid Mechanics from the von Karman Institute (Belgium) and an Engineering Degree in Aeronautical Engineering from UPM (Spain). During his career, he was Visiting Researcher at NASA Advanced Supercomputing Division, the Aeronautics and Astronautics department of Stanford Universty, as well as Jacques Hadamard post-doctoral fellow at Ecole Polytechnique. He was Finalist and Silver Medal in the ERCOFTAC Leonardo da Vinci Award and has been recently awarded an ERC Starting Grant to work on the development of high-order moment closures for plasmas.
“High-order moment models and numerical schemes for partially-ionized plasmas“
Abstract:
Partially ionized plasmas frequently exhibit strong non-equilibrium distribution functions due to collisions with the background gas, as well as the presence of strong electric fields and spatial gradients. This non-equilibrium state often lies beyond the scope of classical fluid closures based on the Chapman-Enskog method (e.g., Fick’s, Ohm’s or Fourier’s laws). Consequently, such systems typically require computationally intensive kinetic simulations. In this work, we investigate high-order moment models to capture the non-equilibrium state using a macroscopic set of equations. In this presentation, we will present a comparison of different high-order moment closures for ions and electrons in partially-ionized plasmas. In the presentation, we will describe the derivation of the collisional source terms in the moment equations from the Boltzmann operator as well as the consequences of the non-equilibrium in the transport. Similarly, we will discuss some of the numerical difficulties and methods in order to approximate the resulting stiff system of non-linear partially-differential system of equations. The numerical solution of the high-order moment models is benchmarked to kinetic simulations of an argon plasma at different pressure regimes, from nearly collisionless to collisionally-dominated.
The seminar will begin at 12:30 pm and will take place in the Salón de Grados.
No previous registration is required.
PhD in Aerospace Engineering UC3M 