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Listar por autor "Alcántara Avila, Francisco"

Mostrando ítems 1-12 de 12

A Code for Simulating Heat Transfer in Turbulent Channel Flow

Lluesma-Rodríguez, Federico; Alcántara-Ávila, Francisco; Pérez Quiles, María Jezabel; Hoyas, S (MDPI AG, 2021-04-01)

[EN] One numerical method was designed to solve the time-dependent, three-dimensional, incompressible Navier-Stokes equations in turbulent thermal channel flows. Its originality lies in the use of several well-known methods ...
Deep Reinforcement Learning for Flow Control Exploits Different Physics for Increasing Reynolds Number Regimes

Varela-Martínez, Pau; Suárez Morales, Pol; Alcántara-Ávila, Francisco; Miró, Arnau; Rabault, Jean; Font, Bernat; García-Cuevas González, Luis Miguel; Lehmkuhl, Oriol; Vinuesa, Ricardo (MDPI AG, 2022-12)

[EN] The increase in emissions associated with aviation requires deeper research into novel sensing and flow-control strategies to obtain improved aerodynamic performances. In this context, data-driven methods are suitable ...
Direct numerical simulation of thermal channel flow for medium¿high Prandtl numbers up to Re_tau = 2000

Alcántara-Ávila, Francisco; Hoyas, Sergio (Elsevier, 2021-09)

[EN] A new set of DNS of a thermal channel flow have been conducted for friction Reynolds and Prandtl numbers up to 2000 and 10, respectively, reaching the Prandtl number of water, 7, for new Reynolds numbers, never simulated ...
DNS of thermal channel flow up to Re-tau=2000 for medium to low Prandtl numbers

Alcántara-Ávila, Francisco; Hoyas, S.; Pérez Quiles, María Jezabel (Elsevier, 2018)

[EN] Direct Numerical Simulations of turbulent heat transfer in a channel flow are presented for three different Reynolds numbers, namely Re-tau = 500, 1000 and 2000. Medium and low values of the molecular Prandtl number ...
Estudio DNS de un problema de estratificación en la mesosfera

Querol Puchal, Ignacio (Universitat Politècnica de València, 2019-09-25)

[ES] La estratificación en la mesosfera es un problema intrínsicamente ligado al estudio de la mecánica de fluidos. El número de Richardson (Ri) es un indicativo de la ponderación de las fuerzas de flotabilidad sobre los ...
Evidences of persisting thermal structures in Couette flows

Alcántara-Ávila, Francisco; Gandía-Barberá, Sergio; Hoyas, S (Elsevier, 2019-04)

[EN] DNS of passive thermal turbulent Couette flow at several friction Reynolds numbers (180, 250, and 500), and the Prandtl number of air are presented. The time averaged thermal flow shows the existence of long and wide ...
Predicting Coherent Turbulent Structures via Deep Learning

Schmekel, D.; Alcántara-Ávila, Francisco; Hoyas, S.; Vinuesa, R. (Frontiers Media, 2022-04-13)

[EN] Turbulent flow is widespread in many applications, such as airplane wings or turbine blades. Such flow is highly chaotic and impossible to predict far into the future. Some regions exhibit a coherent physical behavior ...
Stratification effect on extreme-scale rolls in plane Couette flows

Gandía-Barberá, Sergio; Alcántara-Ávila, Francisco; Hoyas, S; Avsarkisov, Victor (American Physical Society, 2021-03-11)

[EN] The existence of the large-scale structures appearing in turbulent Couette flows is studied by means of a direct numerical simulation data set of active thermal Couette flows for different friction Richardson numbers, ...
Study of the Thermal Field of Turbulent Channel Flows Via Direct Numerical Simulations

Alcántara Ávila, Francisco (Universitat Politècnica de València, 2022-01-24)

[ES] El principal objetivo de esta tesis es el estudio de flujos térmicos turbulentos en canales para obtener un mayor conocimiento sobre el fenómeno de la turbulencia. Para ello, se ha realizado un estudio desde el punto ...
Turbulence Statistics of Arbitrary Moments of Wall-Bounded Shear Flows: A Symmetry Approach

Oberlack, Martin; Hoyas, S; Kraheberger, Stefanie V.; Alcántara-Ávila, Francisco; Laux, Jonathan (American Physical Society, 2022-01-10)

[EN] The calculation of turbulence statistics is considered the key unsolved problem of fluid mechanics, i.e., precisely the computation of arbitrary statistical velocity moments from first principles alone. Using symmetry ...
Validation of symmetry-induced high moment velocity and temperature scaling laws in a turbulent channel flow

Alcántara-Ávila, Francisco; García-Raffi, L. M.; Hoyas, S; Oberlack, Martin (American Physical Society, 2024-02-14)

[EN] The symmetry -based turbulence theory has been used to derive new scaling laws for the streamwise velocity and temperature moments of arbitrary order. For this, it has been applied to an incompressible turbulent channel ...
Wall turbulence at high friction Reynolds numbers

Hoyas, S; Oberlack, Martin; Alcántara-Ávila, Francisco; Kraheberger, Stefanie V.; Laux, Jonathan (American Physical Society, 2022-01-10)

[EN] A new direct numerical simulation of a Poiseuille channel flow has been conducted for a friction Reynolds number of 10000, using the pseudospectral code LISO. The mean streamwise velocity presents a long logarithmic ...