Results 41 to 50 of about 817,469 (302)

Direct numerical simulation of confined weak round fountains in homogeneous ambient

Case Studies in Thermal Engineering, 2021
Fountains (negatively buoyant jets) are commonly used in numerous engineering applications, such as the natural ventilation in buildings and the smoke spread in compartment fires.
Liqiang Dong, Wenxian Lin, Mehdi Khatamifar   +2 more
doaj   +1 more source

Proper Orthogonal Decomposition Closure Models For Turbulent Flows: A Numerical Comparison

, 2011
This paper puts forth two new closure models for the proper orthogonal decomposition reduced-order modeling of structurally dominated turbulent flows: the dynamic subgrid-scale model and the variational multiscale model.
Ahuja, Akhtar, Akhtar, Aubry, Bagheri, Barbagallo, Barrault, Bazilevs, Bergmann, Bergmann, Berselli, Buffoni, Carlberg, Cazemier, Chaturantabut, Chaturantabut, Chorin, Cohen, Couplet, Couplet, Daescu, Dickinson, Evangelinos, Fang, Fang, Galbally, Galletti, Germano, Graham, Guermond, Hay, Hay, Holmes, Hughes, Hughes, Hughes, Imran Akhtar, Iollo, Iollo, Ito, Jeff Borggaard, John, John, Kim, Layton, Leonard, Luo, Ma, Meneveau, Morinishi, Noack, Noack, Noack, Noack, Noack, Norberg, Orszag, Podvin, Podvin, Podvin, Porté-Agel, Rempfer, Rempfer, Sagaut, Sirisup, Sirovich, Smagorinsky, Street, Traian Iliescu, Vasilyev, Vasilyev, Wang, Willcox, Zang, Zhu Wang   +74 more
core   +1 more source

Structural insights into an engineered feruloyl esterase with improved MHET degrading properties

FEBS Letters, EarlyView.
A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa, Konstantinos Makryniotis, Theofani‐Iosifina Sousani, Evangelos Topakas, Vangelis Daskalakis, Maria Dimarogona   +5 more
wiley   +1 more source

Direct Numerical Simulation Tests of Eddy Viscosity in Two Dimensions

, 1994
Two-parametric eddy viscosity (TPEV) and other spectral characteristics of two-dimensional (2D) turbulence in the energy transfer sub-range are calculated from direct numerical simulation (DNS) with 512$^2$ resolution. The DNS-based TPEV is compared with
A. Chekhlov, B. Galperin, I. Staroselsky, Kraichnan R. H., S. A. Orszag, S. Sukoriansky   +5 more
core   +1 more source

Continuous Growth of Droplet Size Variance due to Condensation in Turbulent Clouds [PDF]

, 2015
We use a stochastic model and direct numerical simulation to study the impact of turbulence on cloud droplet growth by condensation. We show that the variance of the droplet size distribution increases in time as t^{1/2}, with growth rate proportional to
Brandt, Luca, Caballero, Rodrigo, Picano, Francesco, Sardina, Gaetano   +3 more
core   +2 more sources

A methionine‐lined active site governs carbocation stabilization and product specificity in a bacterial terpene synthase

FEBS Letters, EarlyView.
This study reveals a unique active site enriched in methionine residues and demonstrates that these residues play a critical role by stabilizing carbocation intermediates through novel sulfur–cation interactions. Structure‐guided mutagenesis further revealed variants with significantly altered product profiles, enhancing pseudopterosin formation. These
Marion Ringel, Carl P. O. Helmer, Shani Zev, Ronja Driller, Emily Buhr, Markus Reinbold, Renana Schwartz, Gabriel Foley, Mikael Boden, Daniel Garbe, Gerhard Schenk, Dan Thomas Major, Bernhard Loll, Thomas Brück   +13 more
wiley   +1 more source

Turbulent Channel Flow: Direct Numerical Simulation-Data-Driven Modeling

Fluids
Data obtained using direct numerical simulations (DNS) of pressure-driven turbulent channel flow are studied in the range 180 ≤Reτ≤ 10,000. Reynolds number effects on the mean velocity profile (MVP) and second order statistics are analyzed with a view of
Antonios Liakopoulos, Apostolos Palasis
doaj   +1 more source

OpenACC Acceleration of Parallel Direct Numerical Simulation of Turbulent Flows [PDF]

Journal of Applied and Computational Mechanics
This work presents a state-of-the-art computational approach for performing large-scale simulations of turbulence on heterogeneous compute nodes.
Ahmed Abdellatif, Joan Grau, Ricardo Torres, Lluís Jofre   +3 more
doaj   +1 more source

Laminar–Turbulent Intermittency in Annular Couette–Poiseuille Flow: Whether a Puff Splits or Not

Entropy, 2020
Direct numerical simulations were carried out with an emphasis on the intermittency and localized turbulence structure occurring within the subcritical transitional regime of a concentric annular Couette–Poiseuille flow.
Hirotaka Morimatsu, Takahiro Tsukahara
doaj   +1 more source

In-service weld repair by direct deposition: Numerical simulation and experimental validation

Engineering Science and Technology, an International Journal, 2023
In-Service Welding is a technological process for which interconnection and repair of pipelines can be made while they are in operation, before making it two main risks need to be assessed: hydrogen cracking and burn-through.
Luis Dante Meléndez-Morales, Jose Jorge Ruíz-Mondragón, Maricruz Hernández-Hernández   +2 more
doaj   +1 more source