Almut Eisentraeger

Fraunhofer Institute for Industrial Mathematics ITWM | ITWM · Department of Transport Processes

High gradient magnetic separation (HGMS) is an efficient way to remove magnetic and paramagnetic particles, such as heavy metals, from waste water. As the suspension flows through a magnetized filter mesh, high magnetic gradients around the wires attract and capture the particles removing them from the fluid. We model such a system by considering t...

In an infusion test the apparent rate of cerebrospinal fluid (CSF) production is temporarily increased through injection of fluid directly into the CSF system with the result that CSF pressure rises, in theory to a new plateau average, and the change in pressure level gives a measure of resistance to CSF outflow and the rate of approach to the plat...

Cerebrospinal fluid (CSF) fills a system of cavities at the centre of the brain, known as ventricles, and the subarachnoid space surrounding the brain and the spinal cord. In addition, CSF is in free communication with the interstitial fluid of the brain tissue. Disturbances in CSF dynamics can lead to diseases that cause severe brain damage or eve...

We consider a steady Darcy flow of fluid through a section of poroelastic material under an applied pressure difference. In porous media flow, the superficial fluid velocity and applied pressure gradient are related by a permeability such that, when the porous material is rigid, specifying either the flow rate or the applied pressure difference all...

We consider parameter estimation for a single compartment model of a cerebrospinal fluid (CSF) infusion test using an inverse power law cerebral compliance depending on intracranial pressure (ICP). A least squares optimization is used to solve the inverse problem of estimating model parameter values from ICP observed during an infusion test. The op...

In this paper, a new model for the below-boiling point evaporation process with a meshfree collocation method is developed. In order to capture the phase change process, two different approaches are proposed: multi-phase and single-phase. First, a multi-phase approach is considered, where a novel mass transfer model assumes that the diffusion drive...

Despite the common use of cutting fluids in metal cutting, most simulations of these processes only consider dry conditions. This is largely due to limitations in conventional simulation methods, such as the Finite Element Method (FEM), regarding fast changing computational domains. In this paper, a simulation model of metal cutting with cutting fl...

The measurement and simulation data, their preparation and the simulation setup published in this co-submission are related to the article “Simulation of metal cutting with cutting fluid using the Finite-Pointset-Method” [1]. Wet and dry turning experiments were conducted at the Institute for Machine Tools and Factory Management (IWF), Berlin, Germ...

The UK Government Decontamination Service (UKGDS) advise Government on the national capability for the decontamination of buildings, infrastructure, transport and the open environment. Additionally, UKGDS are a source of expertise in the event of chemical, biological, radiological or nuclear (CBRN) incidents, and in the major release of hazardous m...

This project's goals are to • couple the Finite Pointset Method with Algebraic Multigrid Methods to solve the arising linear systems. • reduce runtime. • provide a 'black-box' linear solver. The Finite Pointset Method (FPM) is a numerical scheme for time dependent problems in fluid and continuum mechanics [1]. It uses a generalized finite diff...

Cerebrospinal fluid (CSF) fills a system of cavities at the center of the brain, surrounds the brain and the spinal cord, and is in free communication with the interstitial fluid of the brain. Disturbances in CSF dynamics can lead to diseases causing severe brain damage. Biomechanical modelling of CSF flow through the brain tissue is crucial to imp...

We have developed a multi-fluid model for flow of cerebro-spinal fluid (CSF) in the brain which incorporates both CSF and blood pressure variations and has general application for study of hydrocephalus, and particularly here, for simulation of a CSF infusion test. Existing poro-elastic models for CSF flow treat the parenchyma and CSF as a continuu...

The aim of this thesis is a model for the plate deformations, under consideration of large strains, and the implementation of a suitable FE simulation. Starting from nonlinear static 3D elasticity theory and introducing the Kirchhoff assumptions, the total energy of a deformed plate is described solely by the displacements of its midsurface. Minimi...