Search results for: Victor Sofonea

Items from 1 to 11 out of 11 results

article

Application of mixed quadrature lattice Boltzmann models for the simulation of Poiseuille flow at non-negligible values of the Knudsen number

Victor E. Ambruş, Victor Sofonea

Journal of Computational Science > 2016 > 17 > P2 > 403-417

We consider the 2D force-driven Poiseuille flow between parallel plates, on which diffuse reflection boundary conditions apply. We present a systematic procedure for the construction of the force term in lattice Boltzmann models based on mixed Cartesian quadratures, where the quadrature on each axis is selected independently. We find that, at non-negligible value of the Knudsen number, half-range...

article

Lattice Boltzmann models based on half-range Gauss–Hermite quadratures

Victor E. Ambruş, Victor Sofonea

Journal of Computational Physics > 2016 > 316 > C > 760-788

We discuss general features of thermal lattice Boltzmann models based on half-range Gauss quadratures, specialising to the half-range Gauss–Hermite and Gauss–Laguerre cases. The main focus of the paper is on the construction of high order half-range Hermite lattice Boltzmann (HHLB) models. The performance of the HHLB models is compared with that of Laguerre lattice Boltzmann (LLB) and full-range Hermite...

article

Lattice Boltzmann model for predicting the deposition of inertial particles transported by a turbulent flow

Pascal Fede, Victor Sofonea, Richard Fournier, Stéphane Blanco, more

International Journal of Multiphase Flow > 2015 > 76 > C > 187-197

Deposition of inertial solid particles transported by turbulent flows is modelled in a framework of a statistical approach based on the particle velocity Probability Density Function (PDF). The particle-turbulence interaction term is closed in the kinetic equation by a model widely inspired from the famous BGK model of the kinetic theory of rarefied gases. A Gauss-Hermite Lattice Boltzmann model is...

article

Simulation of liquid–vapour phase separation on GPUs using Lattice Boltzmann models with off-lattice velocity sets

Tonino Biciuşcă, Adrian Horga, Victor Sofonea

Comptes Rendus Mecanique > 2015 > 343 > 10-11 > 580-588

We use a two-dimensional Lattice Boltzmann model to investigate the liquid–vapour phase separation in an isothermal van der Waals fluid. The model is based on the expansion of the distribution function up to the third order in terms of Hermite polynomials. In two dimensions, this model is an off-lattice one and has 16 velocities. The Corner Transport Upwind Scheme is used to evolve the corresponding...

article

Implementation of diffuse reflection boundary conditions in a thermal lattice Boltzmann model with flux limiters

Victor Sofonea

Journal of Computational Physics > 2009 > 228 > 17 > 6107-6118

We discuss three new implementation versions of diffuse reflection boundary conditions in a thermal lattice Boltzmann model. Their accuracy is investigated in the case of Couette flow by considering the slip regime. The best results are recovered with versions 2 and 3, which rely on outgoing fluxes to express the particle distribution functions in the ghost nodes outside the flow domain. Version 2...

article

Boundary conditions for the upwind finite difference Lattice Boltzmann model: Evidence of slip velocity in micro-channel flow

Victor Sofonea, Robert F. Sekerka

Journal of Computational Physics > 2005 > 207 > 2 > 639-659

We conduct a systematic study of the effect of various boundary conditions (bounce back and three versions of diffuse reflection) for the two-dimensional first-order upwind finite difference Lattice Boltzmann model. Simulation of Couette flow in a micro-channel using the diffuse reflection boundary condition reveals the existence of a slip velocity that depends on the Knudsen number ε=λ/L, where λ...

article

Two component lattice Boltzmann model with flux limiters

Artur Cristea, Victor Sofonea

Open Physics > 2004 > 2 > 2 > 382-396

A two-dimensional finite difference lattice Boltzmann model for two-component fluid systems is introduced. Phase separaton is achieved using an appropriate expression of the bulk free energy. Flux limiter techniques are used to improve the numberical accuracy of this model.

article

Two component lattice Boltzmann model with flux limiters

Artur Cristea, Victor Sofonea

Open Physics > 2004 > 2 > 2 > 382-396

article

Viscosity of finite difference lattice Boltzmann models

Victor Sofonea, Robert F. Sekerka

Journal of Computational Physics > 2003 > 184 > 2 > 422-434

Two-dimensional finite difference lattice Boltzmann models for single-component fluids are discussed and the corresponding macroscopic equations for mass and momentum conservation are derived by performing a Chapman-Enskog expansion. In order to recover the correct mass equation, characteristic-based finite difference schemes should be associated with the forward Euler scheme for the time derivative,...

article

Lattice Boltzmann model for the simulation of interfacial phenomena in magnetic fluids

Victor Sofonea, Wolf-Gerrit Früh, Artur Cristea

Journal of Magnetism and Magnetic Materials > 2002 > 252 > Complete > 144-146

A very simple lattice Boltzmann model was developed to describe the competition between surface tension and dipolar interaction in magnetic fluids. The model was used to simulate the deformation of magnetic fluid drops in a nonmagnetic fluid, as well as the deformation of a gas bubble in a magnetic fluid under the action of an external magnetic field.

article

BGK models for diffusion in isothermal binary fluid systems

Victor Sofonea, Robert F. Sekerka

Physica A: Statistical Mechanics and its Applications > 2001 > 299 > 3-4 > 494-520

Two Bhatnagar-Gross-Krook (BGK) models for isothermal binary fluid systems-the classical single relaxation time model and a split collision term model-are discussed in detail, with emphasis on the diffusion process in perfectly miscible ideal gases. Fluid equations, as well as the constitutive equation for diffusion, are derived from the Boltzmann equation using the method of moments and the values...

Filter options

Publication date

Set your own date range

Keywords

LATTICE BOLTZMANN (10)
47.11.+J 47.55.KF (2)
BOUNDARY CONDITIONS (2)
FLUX LIMITERS (2)
HASE SEPARATION (2)
RAREFIED GASES (2)
BGK COLLISION TERM (1)
BINARY FLUID (1)
BOLTZMANN EQUATION (1)
CORNER TRANSPORT UPWIND (1)
COUETTE FLOW (1)
DEPOSITION (1)
DIFFUSE REFLECTION (1)
DIFFUSION (1)
FINITE DIFFERENCE SCHEMES (1)
FLUX LIMITER (1)
GAUSS QUADRATURES (1)
HALF-RANGE GAUSS–HERMITE QUADRATURES (1)
HALF-RANGE HERMITE POLYNOMIALS (1)
INTERFACE PHENOMENA (1)
KINEMATIC VISCOSITY (1)
KINETIC APPROACH (1)
MAGNETIC LIQUIDS (1)
MICROFLUIDICS (1)
PARTICLE-TURBULENCE INTERACTION (1)
PHASE SEPARATION (1)
POISEUILLE FLOW (1)
SLIP VELOCITY (1)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 03.40.G (1)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 05.20.DD (1)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 05.60 (1)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 34.10.+X (1)
[PHYSICAL ASTRONOMY CLASSIFICATION SCHEME] 51.20 (1)
more

Data set

Elsevier (9)
PSJD (2)

INFONA - science communication portal

Search results for: Victor Sofonea

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Keywords

Data set

Journal

Reporting an error / abuse

Sending the report failed

Accessibility options