Πλοήγηση ανά Θέμα "Reynolds number"
Αποτελέσματα 1-19 από 19
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Bayesian uncertainty quantification and propagation using adjoint techniques
(2014)This paper presents the Bayesian inference framework enhanced by analytical approximations for uncertainty quantification and propagation and parameter estimation. A Gaussian distribution is used to approximate the posterior ... -
Bayesian uncertainty quantification of turbulence models based on high-order adjoint
(2015)The uncertainties in the parameters of turbulence models employed in computational fluid dynamics simulations are quantified using the Bayesian inference framework and analytical approximations. The posterior distribution ... -
Comparing the effect of three transition models on the CFD predictions of a NACA0012 airfoil aerodynamics
(2016)The ability to accurately predict transition is important for flows around airfoils, especially at low Reynolds numbers. Transition from laminar to turbulent flow strongly influences the flow separation and the skin friction, ... -
Direct numerical simulation of particle-laden turbulent channel flows with two- and four-way coupling effects: Budgets of Reynolds stress and streamwise enstrophy
(2016)The budgets of the Reynolds stress and streamwise enstrophy are evaluated through direct numerical simulations for the turbulent particle-laden flow in a vertical channel with momentum exchange between the two phases. The ... -
Direct numerical simulation of particle-laden turbulent channel flows with two- and four-way coupling effects: Models of terms in the Reynolds stress budgets
(2017)In the first part of this study (Dritselis 2016 Fluid Dyn. Res. 48 015507), the Reynolds stress budgets were evaluated through point-particle direct numerical simulations (pp-DNSs) for the particle-laden turbulent flow in ... -
Dynamic simulations of an encapsulated microbubble translating in a tube at low capillary and Reynolds numbers
(2021)The dynamic translation of a micron-sized encapsulated bubble is investigated numerically inside a horizontal tube where liquid flows under constant pressure drop, when the effect of gravity is neglected. The coating of ... -
The effect of adsorption modeling on the stability of surfactant-laden liquid film flow
(2018)The primary instability of gravity-driven, liquid film flow is examined when the liquid contains a soluble surfactant. It is shown that the model adopted for the description of adsorption equilibrium affects significantly ... -
The effect of anode bed geometry on the hydraulic behaviour of PEM fuel cells
(2016)The influence of the anode bed geometry on the hydraulic behaviour of PEM fuel cells is assessed. Three basic geometrical patterns are studied, namely the interdigitated, the parallel and the serpentine ones, in their ... -
Effect of radius of toroidal square duct on the transition of electromagnetically driven liquid metal flow
(2021)Toroidal magnetohydrodynamic flows are important for fusion technology because of the blanket surrounding the core of the fusion machine. The effect of the radius of toroidal square ducts on flow transition of an ... -
Effects of different porous beds on turbulent characteristics in an open channel above the porous bed
(2017)An analysis of the turbulent characteristics of the flow in an open channel with horizontal porous beds using two-dimensional (2D) Particle Image Velocimetry (PIV) is presented. Hydraulic characteristics such as velocity ... -
Measurements of the stabilisation of liquid film flow by the soluble surfactant sodium dodecyl sulfate (SDS)
(2016)Gravity-driven film flow of aqueous solutions of SDS is studied experimentally and the evolution of small-amplitude, regular inlet disturbances is investigated. With the addition of SDS, strong attenuation of non-linear ... -
A Numerical Study of Developing Buoyancy-Assisted Mixed Convection with Spatially Periodic Wall Heating
(2017)The validity of a parabolic model for simulating the developing buoyancy-assisted mixed convection flow in a vertical channel with spatially periodic wall temperature is verified by a full elliptic model of the momentum ... -
Numerical study of educed coherent structures in the near-wall region of a particle-laden channel flow
(2008)The interaction of small heavy solid particles with turbulence near the wall of a vertical downward channel flow is investigated by using direct numerical simulation (DNS) and Lagrangian particle tracking. The interest is ... -
Numerical study of the interaction between a pulsating coated microbubble and a rigid wall. I. Translational motion
(2021)The dynamic response of an encapsulated bubble to an acoustic disturbance in a wall restricted flow is investigated in the context of axial symmetry, when the viscous forces of the surrounding liquid are accounted for. The ... -
Optimal sensor location for model parameter estimation in CFD
(2013)In this paper the optimal sensor location problem for the estimation of model parameters in computational fluid dynamics is presented. A Bayesian formulation is used to quantify the uncertainties in the model parameters ... -
Recurrence quantification analysis of MHD turbulent channel flow
(2019)We present Recurrence Plots (RPs) and Recurrence Quantification Analysis (RQA) of time series of velocities in a low-Reynolds-number magnetohydrodynamic turbulent channel flow. The flow was simulated using a fully spectral ... -
Reynolds number effect of the turbulent micropolar channel flow
(2022)The turbulent regime of non-Newtonian flows presents a particular interest as flow behavior is directly affected by the internal microstructure type of the fluid. Differences in the dispersed phase of a particle laden flow ... -
Stability of liquid film flow laden with the soluble surfactant sodium dodecyl sulphate: Predictions versus experimental data
(2020)Gravity-driven liquid film flows laden with a soluble surfactant are considered, and aqueous solutions of sodium dodecyl sulphate (SDS) are taken as a case-study. Literature measurements of the critical Reynolds number for ... -
Velocity profiles in a random porous bed
(2021)In this study the velocity distribution of the fluid flow through and over a random porous bed is investigated. The different porous bed and the different porosity influence significantly the form of the velocity profiles. ...