Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Josep M. Bergada"'
Publikováno v:
Applied Sciences, Vol 14, Iss 5, p 1690 (2024)
To activate the boundary layer in Active Flow Control (AFC) applications, the use of pulsating flow has notable energy advantages over constant blowing/suction jet injections. For a given AFC application, five parameters, jet location and width, incl
Externí odkaz:
https://doaj.org/article/157b1c7d86fa408d85ad8b19e41d5c08
Publikováno v:
Applied Sciences, Vol 12, Iss 8, p 3894 (2022)
Genetic Algorithms (GA) are useful optimization methods for exploration of the search space, but they usually have slowness problems to exploit and converge to the minimum. On the other hand, gradient based methods converge faster to local minimums,
Externí odkaz:
https://doaj.org/article/86cf51e5ba954f21b9b2ad8676114279
Autor:
Nil Couto, Josep M. Bergada
Publikováno v:
Applied Sciences, Vol 12, Iss 9, p 4269 (2022)
The present paper introduces a parametric optimization of several Active Flow Control (AFC) parameters applied to a NACA-8412 airfoil at a single post-stall Angle of Attack (AoA) of 15∘ and Reynolds number Re = 68.5×103. The aim is to enhance the
Externí odkaz:
https://doaj.org/article/acf3b0710d034f239443ee9fb55a629c
Publikováno v:
Applied Sciences, Vol 11, Iss 6, p 2619 (2021)
The suspensions used in heavy vehicles often consist of several oil and two gas chambers. In order to perform an analytical study of the mass flow transferred between two gas chambers separated by a nozzle, and when considering the gas as compressibl
Externí odkaz:
https://doaj.org/article/397762603e2d447ab35f661c39511ebb
Autor:
Àlex Navó, Josep M. Bergada
Publikováno v:
Applied Sciences, Vol 10, Iss 22, p 8211 (2020)
A 2D aerodynamic study of the NASA’s X-43A hypersonic aircraft is developed using two different approaches. The first one is analytical and based on the resolution of the oblique shock wave and Prandtl–Meyer expansion wave theories supported by a
Externí odkaz:
https://doaj.org/article/2303f0ba0e034e2aa63b48320ee3fe2d
Autor:
Masoud Baghaei, Josep M. Bergada
Publikováno v:
Applied Sciences, Vol 10, Iss 6, p 2105 (2020)
The number of applications where fluidic oscillators are expected to be used in the future, is raising sharply, then their ability of interacting with the boundary layer to modify forces on bluff bodies, enhancing heat transfer or decreasing noise ge
Externí odkaz:
https://doaj.org/article/f122d6b3595341f18e33ad493c2a6266
Autor:
Josep M. Bergada, Gabriel Bugeda, N.M. Tousi, M. Coma, Fernando Mellibovsky, Jordi Pons-Prats
Publikováno v:
UPCommons. Portal del coneixement obert de la UPC
Universitat Politècnica de Catalunya (UPC)
Universitat Politècnica de Catalunya (UPC)
The use of Active Flow Control (AFC) technologies to modify the forces acting on streamlined bodies is one of the most active research fields in aerodynamics. For each particular application, finding the optimum set of AFC parameters which maximises
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::43614bc61d8bb493557541249936c1e4
https://doi.org/10.1016/j.apm.2021.05.016
https://doi.org/10.1016/j.apm.2021.05.016
Publikováno v:
UPCommons. Portal del coneixement obert de la UPC
Universitat Politècnica de Catalunya (UPC)
Universitat Politècnica de Catalunya (UPC)
We investigate the onset of temporal dynamics of a fluidic oscillator (FO) in the laminar regime at very low Reynolds number ( R e = U h i / ν , where U and h i are the velocity and channel height at inlet, and ν is the kinematic viscosity of the f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f3dbdedafe125bfbd56c00c21a9bd238
https://doi.org/10.1016/j.apm.2021.01.044
https://doi.org/10.1016/j.apm.2021.01.044
Towards a better understanding of wall-driven square cavity flows using the lattice Boltzmann method
Publikováno v:
UPCommons. Portal del coneixement obert de la UPC
Universitat Politècnica de Catalunya (UPC)
Universitat Politècnica de Catalunya (UPC)
Wall-driven flow in square cavities has been studied extensively, yet it appears some main flow characteristics have not been fully investigated. Previous research on the classic lid-driven cavity (S1) flow has produced the critical Reynolds numbers
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8c891771969efa6cb7414c9c19c8a6cb
https://doi.org/10.1016/j.apm.2020.01.057
https://doi.org/10.1016/j.apm.2020.01.057
Publikováno v:
UPCommons. Portal del coneixement obert de la UPC
Universitat Politècnica de Catalunya (UPC)
Universitat Politècnica de Catalunya (UPC)
The present study focuses on the flow over a 2D square cylinder with a plate placed in front of it. An in-house code using the lattice Boltzmann method was employed for all the simulations presented. Few cases were simulated using the open source cod
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b24ab4fa7b54d27a765baf7b165d8fae
https://doi.org/10.1007/s11012-020-01148-8
https://doi.org/10.1007/s11012-020-01148-8