This paper concerns multiphase models of tumor growth in interaction with a surrounding tissue, taking into account also the interplay with diffusible nutrients feeding the cells. Models specialize in nonlinear systems of possibly degenerate parabolic equations, which include phenomenological terms related to specific cell functions. The paper discusses general modeling guidelines for such term...

Downward turbulent bubbly flows in pipes were modeled using computational fluid dynamics tools. The Hydrodynamics, phase distribution and turbulent structure of twophase air-water flow in a 57.15 mm diameter and 3.06 m length vertical pipe was modeled by using the 3-D Eulerian-Eulerian multiphase flow approach. Void fraction, liquid velocity and turbulent fluctuations profiles were calculated a...

In the framework of fundamentals of smart materials and structures, a proper mathematical modeling of electro-kinetic transport phenomena in micro-structures adhering to the law of conservation of mass is suggested. The reference multiphase medium is described by a nonlinear Poisson–Nernst–Planck model stated in a heterogeneous pore-particle space disjoint by the interface. For physical consist...

The paper reviews six examples of CFD applications, useful for: minerals, power generation and oil & gas industry. The review starts with the multiphase modeling of gas injection into a liquid bath, where the CFD results were validated against experimental data. The example is very useful for metal extraction/refining industry. Simulation of a mineral concentrator bin is presented next, where m...

In this paper, the internal structure of novel multiphase gallium nitride nanowires in which multiple zinc-blende and wurtzite crystalline domains grow simultaneously along the entire length of the nanowire is investigated. Orientation relationships within the multiphase nanowires are identified using high-resolution transmission electron microscopy of nanowire cross-sections fabricated with a ...

Programme 10:00 Coffee 10:30 Welcome by Daan Crommelin on behalf of CWI 10:45 Benjamin Sanderse, CWI and Shell, Challenges in computational multiphase flow modelling in the oiland gas industry 11:15 Guido Oud, Delft University of Technology, Solving multiphase flow in pipes using cylindrical coordinates 11:45 Henk Seubers, Groningen University, Multibody interaction in free-surface flows 12:15 ...

We discuss computational engineering and science (CES) methodologies and tools applicable to a variety of subsurface models and their couplings. First we overview both basic and widely recognized multiphase and multicomponent models. In the CES methodologies area we focus on accurate and robust numerical algorithms and linear and nonlinear solvers with parallel scalability. In the CES tools are...

Multiphase flows associated with interfacial dynamics, steep jump in fluid-properties, and moving boundaries between different phases and materials pose substantial computational challenges. Modeling the interfacial dynamics often involves a compromise between the accuracy and efficiency. Recent progress made in handling the geometry of three-dimensional interfaces, adaptive grid refinement, an...

A dynamic model of a nickel hydrogen battery implemented in the Virtual Test Bed (VTB) is presented. The battery system is simplified as such one-electrontransfer redox reaction of nickel hydroxide and nickel oxyhydroxide occurs uniformly and isothermally throughout the entire battery. The reversible potential includes the effect of multiphase activities of nickel oxyhydroxide. The overcharge p...

A thermodynamic dataset was developed for the quinary Ti-Si-B-C-N system. The phase modeling includes all carbides, nitrides, carbonitrides, borides and silicdes which can be used as high temperature structural materials. The CALPHAD approach is used to calculate high-temperature phase reactions in the ternary and quaternary subsystems. The phase stabilities can be derived. All types of phase d...