Maximilian Bittens
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View article: Enhancing Comprehension through Interactive Visualization of Geological Simulation Results under Uncertainty
Enhancing Comprehension through Interactive Visualization of Geological Simulation Results under Uncertainty Open
Digital models and simulations play a critical role in site selection for a deep geological repository for radioactive waste. One of the key aspects of this process is evaluating the integrity of the containment-providing rock zone, which …
View article: Computational Integrity Analysis: Approaches for Uncertainty Quantification and Visualization
Computational Integrity Analysis: Approaches for Uncertainty Quantification and Visualization Open
Given the legal requirement in Germany for documenting uncertainty impacts on safety analyses (§11 EndlSiUntV), a systematic investigation of uncertainties in simulation results is imperative. In several projects, including ANSICHT-II [1],…
View article: From Complexity to Comprehension: Interactive Real-Time Data Visualization for Geological Models and Uncertainty Analysis
From Complexity to Comprehension: Interactive Real-Time Data Visualization for Geological Models and Uncertainty Analysis Open
The search for a repository site and its design rely on digital models and simulations. An integral part of the site selection process is the assessment of the integrity of the containment-providing rock zone. Computational models assessin…
View article: Uncertainty Quantification and Visualization Techniques for Numerical Integrity Analyses
Uncertainty Quantification and Visualization Techniques for Numerical Integrity Analyses Open
This study explores the quantification of uncertainties in integrity assessments of geological barriers in repository systems, which is a crucial aspect required by German law (§5 Endlagersicherheitsanforderungsverordnung (EndlSiAnfV)…
View article: Thermal-geological data for preliminary safety analyses of repository systems in German sedimentary host rocks – new results of the project ThermoBase
Thermal-geological data for preliminary safety analyses of repository systems in German sedimentary host rocks – new results of the project ThermoBase Open
Preliminary safety analyses are part of the site selection procedure for a repository of heat-generating radioactive waste in Germany. The Federal Company for Radioactive Waste Disposal (BGE) is conducting representative preliminary safety…
View article: OpenGeoSysUncertaintyQuantification.jl: a Julia libraryimplementing an uncertainty quantification toolbox forOpenGeoSys
OpenGeoSysUncertaintyQuantification.jl: a Julia libraryimplementing an uncertainty quantification toolbox forOpenGeoSys Open
Bittens, M., (2024). OpenGeoSysUncertaintyQuantification.jl: a Julia library implementing an uncertainty quantification toolbox for OpenGeoSys. Journal of Open Source Software, 9(98), 6725, https://doi.org/10.21105/joss.06725
View article: Statistical analyses on the relevance of thermal data for the safety-related assessment of repository systems - first results from the project ThermoBase
Statistical analyses on the relevance of thermal data for the safety-related assessment of repository systems - first results from the project ThermoBase Open
The ThermoBase project aims to investigate the thermal field in sedimentary areas in Germany. It was initiated by the Federal Company for Radioactive Waste Disposal (BGE) and motivated by design calculations and safety analyses that are to…
View article: How do uncertain parameters affect the analysis of host rock integrity? Methods and preliminary results for a generic clay rock site
How do uncertain parameters affect the analysis of host rock integrity? Methods and preliminary results for a generic clay rock site Open
The thermal, hydraulic, and mechanical effects of excavating the repository mine and the thermal loading of nuclear waste on the safety of the geological barrier system are addressed in the regulations as integrity analyses. For repositori…
View article: Methods for the quantification of uncertainties in thermo–hydro–mechanical simulations for safety analyses and influence of modelling decisions
Methods for the quantification of uncertainties in thermo–hydro–mechanical simulations for safety analyses and influence of modelling decisions Open
The simulation of thermal, hydraulic, and mechanical coupled processes can be a decisive factor in the integrity assessment of geotechnical and geological barriers. Modelling decisions, such as the representation of heterogeneity and the c…
View article: DistributedSparseGrids.jl: A Julia library implementingan Adaptive Sparse Grid collocation method
DistributedSparseGrids.jl: A Julia library implementingan Adaptive Sparse Grid collocation method Open
Bittens et al., (2023). DistributedSparseGrids.jl: A Julia library implementing an Adaptive Sparse Grid collocation method. Journal of Open Source Software, 8(83), 5003, https://doi.org/10.21105/joss.05003
View article: Concept for Numerical THM Integrity Analysis of a Generic Repository in Clayey Rock in Germany
Concept for Numerical THM Integrity Analysis of a Generic Repository in Clayey Rock in Germany Open
Within the ANSICHT project, BGE Technology, BGR, and the Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) developed a safety assessment methodology for a high-level radioactive waste repository in clay formations based on German …
View article: A fully implicit and thermodynamically consistent finite element framework for bone remodeling simulations
A fully implicit and thermodynamically consistent finite element framework for bone remodeling simulations Open
This work addresses the thermodynamically consistent formulation of bone remodeling as a fully implicit finite element material model. To this end, bone remodeling is described in the framework of thermodynamics for open systems resulting …
View article: VTUFileHandler: A VTU library in the Julia languagethat implements an algebra for basic mathematical operations on VTUdata
VTUFileHandler: A VTU library in the Julia languagethat implements an algebra for basic mathematical operations on VTUdata Open
Bittens, M., (2022). VTUFileHandler: A VTU library in the Julia language that implements an algebra for basic mathematical operations on VTU data. Journal of Open Source Software, 7(73), 4300, https://doi.org/10.21105/joss.04300
View article: VTUFileHandler: A VTU library in the Julia language that implements an algebra for basic mathematical operations on VTU data
VTUFileHandler: A VTU library in the Julia language that implements an algebra for basic mathematical operations on VTU data Open
A VTU library in the Julia language that implements an algebra for basic mathematical operations on VTU data.
View article: Technical Report: Virtual X-ray imaging for higher-order finite element results
Technical Report: Virtual X-ray imaging for higher-order finite element results Open
This work describes and demonstrates the operation of a virtual X-ray algorithm operating on finite-element post-processing results which allows for higher polynomial orders in geometry representation as well as density distribution. A nes…
View article: Preliminary stochastic investigations of pore water induced loss of host rock integrity in radioactive waste disposal
Preliminary stochastic investigations of pore water induced loss of host rock integrity in radioactive waste disposal Open
<p>Numerical studies on integrity of the geological barriers in heat generating radioactive waste disposal remain a challenging topic involving modelling of thermal, hydraulic and mechanical (THM) processes within complex geometries,…
View article: An hp-hierarchical framework for the finite element exterior calculus
An hp-hierarchical framework for the finite element exterior calculus Open
The problem of solving partial differential equations (PDEs) on manifolds can be considered to be one of the most general problem formulations encountered in computational multi-physics. The required covariant forms of balance laws as well…