Abdulaziz Ali

Dr. Abdulaziz Ali

Numerical Modeling and Computational Analysis of two-phase Flow Influenced by Soluble Surfactant


In many two-phase fluid-liquid systems with deformable interface, surfactants are present either as impurities or as additives. The distribution of the adsorbed surfactant at the interface affects the dynamical behavior of free interfaces. A quantitative understanding of transport processes happening at liquid interfaces under dynamic conditions is important.


The computational methods are based on the VOF (Volume-of-Fluid) method, volume tracking by additional advection equation for phase indicator, construction of an approximating connected interface as a VOF iso surface [1], piecewise linear surface reconstruction (PLIC), and surface tension with conservative model. Numerical codes are written using the FS3D (Free Surface 3D) VOF code [2].

Preliminary Results

The main objective of this project is the development of a VOF based numerical method for computation of the influence of ionic surfactants on the hydrodynamical and physiochemical properties of fluidic interfaces. The surface active component will be considered soluble in at least one of the bulk phases. The models are based on a continuum mechanical description assuming isothermal flow of two immiscible Newtonian fluids with constant densities and sharp phase boundary (interface).


[1] A. Alke, D. Bothe, 3D numerical modeling of soluble surfactant at fluidic interfaces based on the Volume-of-Fluidic method, FDMP, vol. 1, no. 1, pp. 1-29, 2009.

[2] M. Rieber, PhD-Thesis, ITRL-Stuttgart, 2004.

go to list