Tobias Holzmann

Tobias Holzmann
Holzmann CFD

Dr. mont.

About

9
Publications
80,713
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97
Citations
Introduction
Hello together, I am Tobi working as an enthusiast in the field of computational fluid dynamics, especially using OpenFOAM®. Some of you might know me based on the community contribution I did for OpenFOAM®. My work can be found on https://Holzmann-cfd.com. It is a kind of knowledge-sharing. Keep healthy. Tobi

Publications

Publications (9)
Article
Full-text available
During many industrial solidification processes equiaxed crystals form, grow and move. When those crystals are small they are carried by the melt, whereas when getting larger they sediment. As long as the volume fraction of crystals is below the packing limit, they are able to move relatively free. Crystals being backed in a so called packed bed fo...
Article
Full-text available
During solidification of castings, equiaxed crystals that is formed sink downwards, sediment and form a packed bed. The behavior of separated moving crystals can be described by a submerged object approach, whereas the viscoplastic behavior of a semi-solid slurry follows a volume-averaged viscoplastic constitutive equation. In this work, a two-phas...
Article
Full-text available
Material properties of aluminium alloys can usually be achieved by a heat treatment and quenching procedure. In case that only local strengthening is needed, a local heat treatment and quenching strategy could be an option to the energy intensive, time consuming and costly treatment of the whole part. One of the essential problem using a local stre...
Book
Full-text available
This book gives an introduction to the underlying mathematics used in the field of computational fluid dynamics. After presenting the mathematics aspects, all conservation equations are derived using a finite volume element, dV. It is precisely described how the mass and momentum equation can be obtained. Subsequently, all kinds of the energy equat...
Article
Full-text available
In Heat Transfer and Fluid Flow Laboratory in Brno, the inverse heat conduction problem (IHCP) has been extensively used to reconstruct thermal boundary conditions at hot surfaces of solid materials cooled by spraying nozzles. More than three decades of experience and cooperation with industries has proven our experimental/numerical technique to be...
Conference Paper
Full-text available
Motion of non-metallic inclusions (NMIs) in molten steel and deposition of them on nozzle wall leading to clogging are simulated using a two-way coupling model. In this model different steps of clogging have been considered including transport of NMIs by turbulent melt flow towards the nozzle wall, adhesion of the NMI on the wall, and formation and...
Chapter
The numerical investigation of common heat treated A356 as-cast parts was successfully exhibited by several authors for T4, T6 and T7 tempers. However, for non-uniform or local heat treatments (e.g. welding) the common procedure of estimating the material properties cannot be used. Therefore, a new methodology was developed in order to overcome the...
Conference Paper
Full-text available
The turbulent flow is a complex phenomenon, especially when it is related to such a sophisticated process as the continuous casting (CC). The flow in the submerged entry nozzle (SEN) or in the CC mold can often become very chaotic, if one casts at the operating condition limits. Moreover, there are some " butterfly effects " , appearing even at the...
Chapter
The mechanic properties of many Aluminum alloys can be changed by a heat treatment and quenching procedure. If locally a strengthening of the alloy is needed, a localized heat treatment and quenching procedure may be an alternative to the energy intensive and costly treatment of the whole part. However, it is not obvious which process parameters ar...

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Projects

Projects (5)
Project
Hi everybody, right now I am working on an update of my book in order to conform with the latest development line. Additionally, I want to extend the book with different things such as "Explaining how the construction of a matrix is performed and so on". If one wants to extend my book with e.g. multiphase physics, solid mechanics, or other stuff, feel free to contact me.
Project
This year I want to generate a row of screencasts to demonstrate the usage of OpenFOAM®, Salome® and Blender® in the field of computational fluid dynamics. I am trying to explain how you can use Salome® for generating or/and manipulating your geometry, how to mesh the single patches, export them, build a regional STL, create the feature edge mesh with Blender® and how to mesh everything with snappyHexMesh. You find the videos on my website https://Holzmann-cfd.com
Archived project
At the moment I am checking the 6DoF library to understand the behavior and the calculations that are done. The investigation is made for the purpose, to use 6DoF with the AMI or ACMI interface. Up to know I set-up a case in which an air flow should force a rotor to move. and it seems to work. However, the main goal of the project is to generate a tutorial for the community that demonstrates the correct usage of the 6DoF library in conjunction with the finiteVolumeMeshSolver. The advantage of using AMI instead of mesh morphing is based on the fact, that morphing can only be done till a special angle based on the mesh quality.