A reacting packed-bed undergoing a high-temperature thermochemical solid-gas transformation is considered. The steamand dry-gasification of carbonaceous materials to syngas is selected as the model reaction. The exact 3D digital geometrical representation of the packed-bed is obtained by computer tomography and used in direct pore-level simulations to characterize its morphological and radiativ...

Abstract In this work a finite element-based model for analyzing incompressible flows in flexible channels is presented. The treats the fluid–solid interaction problem monolithic way, where governing equations both sub-domains are solved on single moving grid taking advantage of an arbitrary Lagrangian/Eulerian framework (ALE). unified implementation developed, these distinguished only terms me...

We present a model for fluid-saturated granular media coupled flow and mechanical deformation. The fluid is assumed to be incompressible and the solid part is assumed to be a cohesive granular material. Forces exerted by the fluid in motion are determinated and applied to solid particles. We derive a finite volumes formulation of the flow problem and we couple it to a discrete element method (D...

This paper presents an adaptive mesh moving technique for three-dimensional (3D) fluid flow problems that involve moving fluid boundaries and fluid–solid interfaces. Such mesh moving techniques are an essential ingredient of fluid–structure interaction methods that typically employ arbitrary Lagrangian– Eulerian (ALE) frameworks. In the ALE frame, the velocity field representing motion of the u...

Simulations of viscoplastic materials are traditionally governed by continuum mechanics. The viscous behavior is typically modeled as an internal force, defined by diverse quantities. This work introduces a fluid model to simulate the viscoplastic effect of solid materials, such as plastic, wax, clay and polymer. Our method consists in modeling a solid object through a non-Newtonian fluid with ...

a numerical investigation of forced convection in a channel with hot solid block inside a square porous block mounted on a bottom wall was carried out. the lattice boltzmann method was applied for numerical simulations. the fluid flow in the porous media was simulated by brinkman-forchheimer model. the effects of parameters such as porosity and thermal conductivity ratio over flow pattern and t...

A simple model of globular proteins which incorporates anisotropic attractions is proposed. It is closely related to models used to model simple hydrogen-bonding molecules such as water. Theories for both the fluid and solid phases are presented, and phase diagrams calculated. The model protein exhibits a fluidfluid transition which is metastable with respect to the fluid-solid transition for m...

Common three-dimensional (3D) modeling software mainly uses sequence modeling method based on feature tree structure. This kind of parametric modeling is achieved by using dimensional constraints. However, re-editing of any historical features will cause regeneration of the subsequent features, thus resulting in substantial waste of computer resources and time. Compared with sequence modeling t...

The work investigates the applicability of unresolved Computational Fluid Dynamics and Discrete Element Method (CFDDEM) technique based on empirical equations for fluid-particle coupling. We first carry out a series representative volume element simulations using high-resolution particle-resolved Lattice Boltzmann method (LBMDEM) coupled by an Immersed Moving Boundary (IMB) scheme. Then, we com...