CART3DADAPT

"MARKER-BASED, 3-D ADAPTIVE CARTESIAN GRID METHOD FOR MULTIPHASE FLOW AROUND IRREGULAR GEOMETRIES"

 Partecipanti

Mappa

 Word cloud

Esplora la "nuvola delle parole (Word Cloud) per avere un'idea di massima del progetto.

 Obiettivo del progetto (Objective)

'Computational simulations of multiphase flow are challenging because many practical applications require adequate resolution of not only interfacial physics associated with moving boundaries with possible topological changes, but also around three-dimensional, irregular solid geometries. This project focuses on the simulations of fluid/fluid dynamics around complex geometries, based on an Eulerian-Lagrangian framework. The approach envisions using two independent but related grid layouts to track the interface and solid boundaries. In particular, the stationary Cartesian grid with automated local adaptive refinement capabilities is to handle the computation of the transport equations, while the interface shape and movement are treated by marker-based triangulated surface meshes which freely move and interact with the Cartesian grid. The markers are also used for identifying the location of the solid boundaries and enforcing the no-slip condition there. Issues related to the contact line treatment, topological changes of multiphase fronts during merger or breakup of objects, and necessary data structures and solution techniques will be investigated. Validation studies will be carried using (i) interface in a time-reversed vortex field (ii) effect of spurious currents (iii) Buoyancy driven rising bubble (iv) Drop impacting on a flat surface (v) Binary drop collision.'

Introduzione (Teaser)

The motion of liquids and gases has always been difficult to capture because of the complex interaction of fluids with their surrounding environment. To better understand fluid phenomena, EU-funded scientists seek to computationally reproduce them, with countless practical applications.

Descrizione progetto (Article)

In simulating the motion of a fluid, scientists working on the 'Marker-based, 3-D adaptive Cartesian grid method for multiphase flow around irregular geometries' (CART3DADART) project do not consider the Navier-Stokes equations in isolation. The Navier-Stokes equations reveal the velocity and pressure of a fluid rushing by any point near an object's surface.

The CART3DADART scientists examine the boundary conditions at the point where the fluid meets the rigid body. In imposing boundary conditions on stationary or moving solid objects, they face similar challenges with multiphase flows. To track the solid boundary conditions as well as the conditions at the fluid-air interface, a new approach has been adopted.

For the computational fluid dynamics (CFD) code developed, two different techniques that allow simulations to be computed on an underlying grid were combined. Specifically, a stationary (Eulerian) grid is applied to resolve the flow field. On the other hand, moving (Lagrangian) surface meshes allow to modify the grid to match the fluid-air interface and solid boundaries.

The independent but related grid layouts combined to resolve the fluid flow and treat the fluid interface and solid boundaries promise an effective fluid simulator. However, the development of an in-house effective CFD code is not only intended to enhance research in numerical simulations. In the next two years, the CART3DADART project is expected to help scientists develop a research agenda covering a wide range of problems.