Results 81 to 90 of about 1,075,600 (388)
Implementation/validation of a low Reynolds number two-equation turbulence model in the Proteus Navier-Stokes code: Two-dimensional/axisymmetric [PDF]
The implementation and validation of the Chien low Reynolds number k-epsilon turbulence model in the two dimensional axisymmetric version Proteus, a compressible Navier-Stokes computer code, are presented.
Bui, Trong T.
core +1 more source
ChemCatChem, EarlyView.Scaling beyond the laboratory exposes enzymes to new stresses. Exposure experiments reveal that dynamic gas‐liquid interfaces introduced by sparging or air entrainment during agitation are the main drivers of HMFO deactivation. Replacing bubbles with a membrane‐based bubble‐free aeration system dramatically enhances stability. These experiments provide
Amalie Vang Høst +4 more
wiley +1 more source
Numerical and experimental investigation of swirling flow in a conical diffuser
EPJ Web of Conferences, 2015 The decelerated swirling flow often breaks down into helical structure which is unstable and causes unsteady velocity and pressure fields. The numerical and experimental investigation of this flow pattern is carried out on the experimental apparatus ...
David Štefan +3 more
doaj +1 more source
Equations for Turbulent Flood Waves [PDF]
arXiv, 1994 Long waves in rivers, estuaries and floods are described by the St Venant and Boussinesq equations in classical fluid dynamics. Based on the widely used $k$-$\epsilon$ model for turbulence, we use the techniques of centre manifold theory to show how these classical models can be derived from a unified approach to low-dimensional modelling.
arxiv
An Improved K-Epsilon Model for Near-Wall Turbulence and Comparison with Direct Numerical Simulation [PDF]
An improved k-epsilon model for low Reynolds number turbulence near a wall is presented. The near-wall asymptotic behavior of the eddy viscosity and the pressure transport term in the turbulent kinetic energy equation is analyzed. Based on this analysis,
Shih, T. H.
core +1 more source
Improving the Efficiency of a Bioreactor Equipped With Mixed‐Flow Impellers
Chemical Engineering &Technology, EarlyView.The present work investigated the biological performance of mixed‐flow impellers. To the authors’ knowledge, this is the first experimental study on such impellers in a fermentation process using A. vinelandii, which was chosen as a microorganism due to its high oxygen demand.
David Posadas‐Navarro +6 more
wiley +1 more source
First and Second Order Turbulence Closures Applied to Homogeneous Turbulent Bubbly Flows
Journal of Applied Fluid Mechanics, 2019 First and second turbulence models for turbulent bubbly flows are implemented in the CFD code. In the second order turbulence closure, the Reynolds stress tensor of the continuous phase is split into two parts: a turbulent part produced by the gradient ...
F. Chaibina, G. Bellakhal, J. Chahed
doaj
Journal of EngineeringThe present work is dedicated to the study of multiphase turbulent and three-dimensional rotational flow in dust cyclones, a contribution to air pollution control.
Tchinda Vermande Paganel +3 more
doaj +1 more source
Modeling of near-wall turbulence [PDF]
An improved k-epsilon model and a second order closure model is presented for low Reynolds number turbulence near a wall. For the k-epsilon model, a modified form of the eddy viscosity having correct asymptotic near wall behavior is suggested, and a ...
Mansour, N. N., Shih, T. H.
core +1 more source
Experimental and Numerical Investigation of Flow under Sluice Gates [PDF]
, 2012 The flow characteristics upstream and downstream of sluice gates are studied experimentally and numerically using Reynolds averaged Navier-Stokes two-dimensional simulations with a volume of fluid method.
Belaud, Gilles, Cassan, Ludovic
core +2 more sources