65 citations · 338 across the 17 of their papers we have counts for
16 papers · 1 filter
A consistent treatment of dynamic contact angles in the sharp-interface framework with the generalized Navier boundary condition
Tomas Fullana, Yash Kulkarni, Mathis Fricke +4
In this work, we revisit the Generalized Navier Boundary condition (GNBC) introduced by Qian et al.\ in the sharp interface Volume-of-Fluid context. We replace the singular uncompe…
Thin viscoelastic dewetting films of Jeffreys type subjected to gravity and substrate interactions
Valeria Barra, Shahriar Afkhami, Lou Kondic
This work presents a study of the interfacial dynamics of thin viscoelastic films subjected to the gravitational force and substrate interactions induced by the disjoining pressure…
Numerical Simulations of Nearly Incompressible Viscoelastic Membranes
Valeria Barra, Shawn A. Chester, Shahriar Afkhami
This work presents a novel numerical investigation of the dynamics of free-boundary flows of viscoelastic liquid membranes. The governing equation describes the balance of linear m…
Challenges of Numerical Simulation of Dynamic Wetting Phenomena: A Review
Shahriar Afkhami
Wetting is fundamental to many technological applications that involve the motion of the fluid-fluid interface on a solid. While static wetting is well understood in the context of…
Pore-scale direct numerical simulation of Haines jumps in a porous media model
Adam O'Brien, Shahriar Afkhami, Markus Bussmann
Direct numerical simulations are presented for a porous media model consisting of two immiscible fluids, an invading and defending phase, in a two-dimensional micro-geometry filled…
Breakup of finite-size liquid filaments: Transition from no-breakup to breakup including substrate effects
A. Dziedzic, M. Nakrani, B. Ezra +3
This work studies the breakup of finite-size liquid filaments, when also including substrate effects, using direct numerical simulations. The study focuses on the effects of three…
Ferrofluids and magnetically guided superparamagnetic particles in flows: A review of simulations and modeling
S. Afkhami, Y. Renardy
Ferrofluids are typically suspensions of magnetite nanoparticles, and behave as a homogeneous continuum. The production of nanoparticles with a narrow size distribution and the ach…
Transition in a numerical model of contact line dynamics and forced dewetting
S. Afkhami, J. Buongiorno, A. Guion +4
We investigate the transition to a Landau-Levich-Derjaguin film in forced dewetting using a quadtree adaptive solution to the Navier-Stokes equations with surface tension. We use a…
Direct numerical simulation of variable surface tension flows using a Volume-of-Fluid method
Ivana Seric, Shahriar Afkhami, Lou Kondic
We develop a general methodology for the inclusion of variable surface tension into a Volume-of-Fluid based Navier-Stokes solver. This new numerical model provides a robust and acc…
Interfacial Dynamics of Thin Viscoelastic Films and Drops
Valeria Barra, Shahriar Afkhami, Lou Kondic
We present a computational investigation of thin viscoelastic films and drops on a solid substrate subject to the van der Waals interaction force, in two spatial dimensions. The go…
A numerical approach for the direct computation of flows including fluid-solid interaction: modeling contact angle, film rupture, and dewetting
K. Mahady, S. Afkhami, L. Kondic
In this paper, we present a computationally efficient method for including fluid-solid interactions into direct numerical simulations of the Navier-Stokes equations. This method is…
Interfacial deformation and jetting of a magnetic fluid
Shahriar Afkhami, Linda J. Cummings, Ian M. Griffiths
An attractive technique for forming and collecting aggregates of magnetic material at a liquid--air interface by an applied magnetic field gradient was recently addressed theoretic…
A volume of fluid method for simulating fluid/fluid interfaces in contact with solid boundaries
Kyle Mahady, Shahriar Afkhami, Lou Kondic
In this paper, we present a novel approach to model the fluid/solid interaction forces in a direct solver of the Navier-Stokes equations based on the volume of fluid interface trac…
Capillary focusing close to a topographic step: Shape and instability of confined liquid filaments
M. Hein, S. Afkhami, R. Seemann +1
Step-emulsification is a microfluidic technique for droplet generation which relies on the abrupt decrease of confinement of a liquid filament surrounded by a continuous phase. A s…
A volume-of-fluid formulation for the study of co-flowing fluids governed by the Hele-Shaw equations
Shahriar Afkhami, Yuriko Renardy
We present a computational framework to address the flow of two immiscible viscous liquids which co-flow into a shallow rectangular container at one side, and flow out into a holdi…
Numerical simulation of ejected molten metal-nanoparticles liquefied by laser irradiation: Interplay of geometry and dewetting
S. Afkhami, L. Kondic
Metallic nanoparticles, liquefied by fast laser irradiation, go through a rapid change of shape attempting to minimize their surface energy. The resulting nanodrops may be ejected…