On differences between deterministic and statistical models of the interphase region

T Wacławczyk - Acta Mechanica Sinica, 2022 - Springer
This paper reviews differences between the deterministic (sharp and diffuse) and statistical
models of the interphase region between the two-phases. In the literature this region is …

A consistent solution of the re-initialization equation in the conservative level-set method

T Wacławczyk - Journal of Computational Physics, 2015 - Elsevier
In this paper, a new re-initialization method for the conservative level-set function is put
forward. First, it has been shown that the re-initialization and advection equations of the …

On a relation between the volume of fluid, level-set and phase field interface models

T Wacławczyk - International Journal of Multiphase Flow, 2017 - Elsevier
This paper discusses a relation between the re-initialization equation of the level-set
functions derived by Wacławczyk [J. Comput. Phys., 299 (2015)] and the condition for the …

Comparison of different techniques to calculate properties of atmospheric turbulence from low-resolution data

M Wacławczyk, AS Gozingan, J Nzotungishaka… - Atmosphere, 2020 - mdpi.com
In this work we study different techniques to estimate basic properties of turbulence, that is
its characteristic velocity and length scale from low-resolution data. The methods are based …

Modeling of non-equilibrium effects in intermittency region between two phases

T Wacławczyk - International Journal of Multiphase Flow, 2021 - Elsevier
This paper concerns modeling of the evolution of the intermittency region between two
weakly miscible phases due to temporal and spatial variations of its characteristic length …

Modelling of high-velocity free-surface flows: a revised interfacial area approach

A Vikhansky - Journal of Hydraulic Research, 2024 - Taylor & Francis
The specific interface area transport equation is derived from first principles, and a closure
model for turbulent flow is proposed. The flow is modelled by a two-phase method providing …

A priori study for the modelling of velocity–interface correlations in the stratified air–water flows

M Wacławczyk, T Wacławczyk - International Journal of Heat and Fluid …, 2015 - Elsevier
This work concerns the modelling of stratified two-phase turbulent flows with interfaces. We
consider an equation for an intermittency function α (x, t) which denotes the probability of …

[HTML][HTML] Interface retaining coarsening of multiphase flows

X Chen, J Lu, G Tryggvason - Physics of Fluids, 2021 - pubs.aip.org
Multiphase flows are characterized by sharp moving interfaces, separating different fluids or
phases. In many cases, the dynamics of the interface determines the behavior of the flow. In …

Modelling of turbulence-interface interactions in stratified two-phase flows

T Wacławczyk, M Wacławczyk… - Journal of Physics …, 2014 - iopscience.iop.org
In this work we describe interactions between turbulence and water-air surface in the
ensemble-averaged picture where, instead of a sharp interface between the phases we deal …

Topological changes due to non-equilibrium effects by means of the statistical model of two-phase flow

T Wacławczyk - arXiv preprint arXiv:2109.15058, 2021 - arxiv.org
This paper presents the first results of the two-phase flow simulation obtained using recently
introduced physical, mathematical and numerical model of the intermittency region between …