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Now showing items 1-10 of 18

#### Large Eddy Simulation of near-bed pipelines in oscillatory flow

(2018)

A series of unsteady, three-dimensional numerical simulations of the incompressible, oscillatory flow around a near-bed pipeline is presented. A flow at Reynolds number equal to Reαo=20,000 with respect to the oscillatory ...

#### The contribution of active and inactive structures to the statistics of a turbulent pipe flow

(2017)

The current study is a short follow-up to our most recent work (Stylianou et al., 2016), where among other things we have presented an effective criterion suitable for distinguishing large-scale coherent structures with ...

#### Effect of turbulent pulsating flow around a near-wall submerged cylinder on the potential motion of bed and suspended loads

(International Society of Offshore and Polar Engineers, 2016)

In the present work, the pulsating flow around a submerged cylinder close to the impermeable seabed is examined by means of Large Eddy Simulations (LES). A Reynolds number equal to Re = 5000 is considered, based on the ...

#### The ASBM-SA turbulence closure: Taking advantage of structure-based modeling in current engineering CFD codes

(2015)

Structure-based turbulence models (SBM) carry information about the turbulence structure that is needed for the prediction of complex non-equilibrium flows. SBM have been successfully used to predict a number of canonical ...

#### Solution of viscoplastic flows with the finite volume / multigrid method

(National Technical University of Athens, 2013)

We investigate the performance of the finite volume method in solving viscoplastic flows. The square lid-driven cavity flow of a Bingham plastic is chosen as the test case and the constitutive equation is regularised as ...

#### Dispersed-phase structure in sheared MHD turbulence

(2012)

Direct numerical simulations are performed to examine particle dispersion in homogeneous turbulence subjected to mean shear and an externally applied magnetic field. We employ the Brucker et al. algorithm for simulating ...

#### Laminar free convection in a square enclosure driven by the Lorentz force

(2010)

A numerical study is presented of laminar free convection flow driven by magnetic forces. An external magnetic field with one spatially varying component is applied to an electrically conducting fluid in a square enclosure. ...

#### Three dimensional flow around a circular cylinder confined in a plane channel

(2011)

This paper presents two- and three-dimensional direct numerical simulations of the flow around a circular cylinder placed symmetrically in a plane channel. Results are presented in the Reynolds number range (based on the ...

#### Thixotropic flow past a cylinder

(2014)

We study the flow of a thixotropic fluid around a cylinder. The rheology of the fluid is described by means of a structural viscoplastic model based on the Bingham constitutive equation, regularised using the Papanastasiou ...

#### Direct numerical simulation of particle laden flow in a human airway bifurcation model

(2016)

During the delivery of inhaled medicines, and depending on the size distribution of the particles in the formulation, airway bifurcations are areas of preferential deposition. Previous studies of laminar flow through airway ...