Recent Submissions

  • Analysis of soot formation in a lab-scale Rich-Quench-Lean combustor using LES with tabulated chemistry 

    Pachano, Leonardo; Kalbhor, Abhijit; Mira Martinez, Daniel; van Oijen, Jeroen (Elsevier, 2024)
    Article
    Restricted access - publisher's policy
    A numerical study of the effects of air dilution on soot formation and particle dynamics in a lab-scale rich-quench-lean (RQL) combustor is presented using large-eddy simulations (LES) with tabulated chemistry. The modeling ...
  • Temporal entropy and the complexity of computing the expectation value of local operators after a quench 

    Carignano, Stefano; Ramos Marimón, Carlos; Tagliacozzo, Luca (American Physical Society, 2024-07)
    Article
    Open Access
    We study the computational complexity of simulating the time-dependent expectation value of a local operator in a one-dimensional quantum system by using temporal matrix product states(MPSs) and argue that it is intimately ...
  • An algebraic global linelet preconditioner for incompressible flow solvers 

    Olazábal, Ramiro de; Borrell Pol, Ricard; Lehmkuhl Barba, Oriol (2024-10-01)
    Article
    Open Access
    Given the wide range of scales present in fluid dynamics, highly anisotropic meshes are often employed to resolve boundary layer flow at high Reynolds numbers. However, such meshes result in distorted elements, which can ...
  • Hybrid State Estimation: Integrating Physics-Informed Neural Networks with Adaptive UKF for Dynamic Systems 

    Curtó, Joaquim, de; Zarzà i Cubero, Irene, de (MDPI, 2024)
    Article
    Open Access
    In this paper, we present a novel approach to state estimation in dynamic systems by combining Physics-Informed Neural Networks (PINNs) with an adaptive Unscented Kalman Filter (UKF). Recognizing the limitations of traditional ...
  • The JET hybrid scenario in Deuterium, Tritium and Deuterium-Tritium 

    Hobirk, Jörg; Challis, C.D.; Kappatou, Athina; Lerche, E.; Keeling, D.; Gallart, Daniel; Mantsinen, Mervi M. (IOP Publishing, 2023)
    Article
    Open Access
    The JET hybrid scenario has been developed from low plasma current carbon wall discharges to the record-breaking Deuterium-Tritium plasmas obtained in 2021 with the ITER-like Be/W wall. The development started in pure ...
  • Detection of alpha heating in JET-ILW DT plasmas by a study of the electron temperature response to ICRH modulation 

    Mantica, Paola; Auriemma, Fulvio; Casiraghi, I.; Gallart, Daniel; Kirov, K.; Mantsinen, Mervi M. (IOP Publishing, 2024)
    Article
    Open Access
    In the JET DTE2 campaign a new method was successfully tested to detect the heating of bulk electrons by α-particles, using the dynamic response of the electron temperature T e to the modulation of ion cyclotron resonance ...
  • On the flow past a three-element wing: mean flow and turbulent statistics 

    Montalà Sales, Ricard; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María (Springer, 2024-07-04)
    Article
    Open Access
    Large eddy simulations (LES) on the flow past the 30P30N three-element high-lift wing at a moderate Reynolds number Rec = 750, 000 and three different angles of attack α = 5, 9 and 23° are conducted. The main focus is on ...
  • The origin of Jupiter's Great Red Spot 

    Sanchez Lavega, Agustin; García Melendo, Enrique José; Legarreta, Jon J.; Miró Jané, Arnau; Soria Guerrero, Manel; Ahrens Velásquez, Kevin (2024-06-28)
    Article
    Open Access
    Jupiter's Great Red Spot (GRS) is the largest and longest-lived known vortex of all solar system planets but its lifetime is debated and its formation mechanism remains hidden. G. D. Cassini discovered in 1665 the presence ...
  • Defining metric-aware size-shape measures to validate and optimize curved high-order meshes 

    Aparicio Estrems, Guillermo; Gargallo Peiró, Abel; Roca Navarro, Francisco Javier (Elsevier, 2024-03)
    Article
    Restricted access - publisher's policy
    We define a regularized size-shape distortion (quality) measure for curved high-order elements on a Riemannian space. To this end, we measure the deviation of a given element, straight-sided or curved, from the stretching, ...
  • LES of a pressurized sooting aero-engine model burner using a computationally efficient discrete sectional method coupled to tabulated chemistry 

    García Oliver, José María; Pastor, José Manuel; Olmeda, I.; Kalbhor, Abhijit; Mira Martinez, Daniel; van Oijen, Jeroen (Elsevier, 2024-02)
    Article
    Open Access
    This work is focused on the modeling and analysis of soot formation and oxidation in the pressurized ethylene-based model burner investigated at DLR. This burner features a dual swirler configuration for the primary air ...
  • Refining simplex points for scalable estimation of the Lebesgue constant 

    Jiménez Ramos, Albert; Gargallo Peiró, Abel; Roca Navarro, Francisco Javier (Springer, 2023)
    Conference report
    Restricted access - publisher's policy
    To estimate the Lebesgue constant, we propose a point refinement method on the d-dimensional simplex. The proposed method features a smooth gradation of the point resolution, neighbor queries based on neighbor-aware ...
  • Active flow control of a turbulent separation bubble through deep reinforcement learning 

    Font, Bernat; Alcántara Ávila, Francisco; Rabault, Jean; Vinuesa, Ricardo; Lehmkuhl Barba, Oriol (IOP Publishing, 2024)
    Conference lecture
    Open Access
    The control efficacy of classical periodic forcing and deep reinforcement learning (DRL) is assessed for a turbulent separation bubble (TSB) at Reτ = 180 on the upstream region before separation occurs. The TSB can resemble ...

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