18 citations · 73 across the 19 of their papers we have counts for
21 papers
RAT-EC: Introducing a New Open-Source 3D Volume-Integral Eddy-Current Module
Daniel Mayr, Jeroen van Nugteren, Julien Dular +3
We present RAT-EC, an open-source volume-integral eddy-current module for unstructured meshes, driven in the time domain by coils of arbitrary winding geometry. It is the first ope…
Current patterns and loss contributions in CORT cables carrying AC current
Benoît Vanderheyden, Julien Dular, Louis Denis +4
Conductor-on-round-tube (CORT) cables are a potential solution for carrying AC power in a small cross-section. Due to the geometry of the cable and the helical arrangement of the c…
Explicit Turn Resolution with Anisotropic Homogenisation for Efficient 3D Magneto-Thermal Finite-Element Simulation of Large-Scale No-Insulation HTS Magnets
Louis Denis, Erik Schnaubelt, Julien Dular +3
No-insulation (NI) and metal-insulation (MI) high-temperature superconducting (HTS) magnets require three-dimensional (3D) models to describe the current distribution around critic…
Surface Contact Approximation for Magneto-Thermal Finite Element Analysis of No-Insulation HTS Coils
Erik Schnaubelt, Louis Denis, Mariusz Wozniak +2
High-temperature superconducting (HTS) coated conductors (CCs) can be wound into no-insulation (NI) coils, in which electrical current can partially bypass local normal zones via t…
Distributed Inter-Strand Coupling Current Model for Finite Element Simulations of Rutherford Cables
Julien Dular, Alexander Glock, Arjan Verweij +1
In this paper, we present the Distributed Inter-Strand Coupling Current (DISCC) model. It is a finite element (FE) model based on a homogenization approach enabling efficient and a…
Acceleration of Multi-Scale LTS Magnet Simulations with Neural Network Surrogate Models
Louis Denis, Julien Dular, Vincent Nuttens +3
While the prediction of AC losses during transients is critical for designing large-scale low-temperature superconducting (LTS) magnets, brute-force finite-element (FE) simulation…
Reduced Order Hysteretic Flux Model for Transport Current Homogenization in Composite Superconductors
Alexander Glock, Julien Dular, Arjan Verweij +1
In this paper, we present the Reduced Order Hysteretic Flux (ROHF) model to describe the relationship between time-varying transport current and internal magnetic flux for composit…
High Field Magnet Programme -- European Strategy Input
B. Auchmann, E. Todesco, A. Ballarino +6
In this submission, we describe research goals, implementation, and timelines of the High Field Magnet Programme, hosted by CERN. The programme pursues accelerator-magnet R&D with…
Simulation of Rutherford Cable AC Loss and Magnetization with the Coupled Axial and Transverse Currents Method
Julien Dular, Fredrik Magnus, Erik Schnaubelt +2
The coupled axial and transverse currents (CATI) method was recently introduced to model the AC loss and magnetization in twisted composite superconducting strands with low computa…
Influence of Critical Current Distribution on Operation, Quench Detection and Protection of HTS Pancake Coils
Mariusz Wozniak, Erik Schnaubelt, Sina Atalay +5
High-temperature superconductor (HTS) coated conductors (CC) are often wound into pancake coils with electrical insulation in-between the turns. The copper terminals are used for c…
Reduced Order Hysteretic Magnetization Model for Composite Superconductors
Julien Dular, Arjan Verweij, Mariusz Wozniak
In this paper, we propose the Reduced Order Hysteretic Magnetization (ROHM) model to describe the magnetization and instantaneous power loss of composite superconductors subject to…
Parallel-in-Time Integration of Transient Phenomena in No-Insulation Superconducting Coils Using Parareal
Erik Schnaubelt, Mariusz Wozniak, Julien Dular +3
High-temperature superconductors (HTS) have the potential to enable magnetic fields beyond the current limits of low-temperature superconductors in applications like accelerator ma…
Coupled Axial and Transverse Currents Method for Finite Element Modelling of Periodic Superconductors
Julien Dular, Fredrik Magnus, Erik Schnaubelt +2
In this paper, we propose the Coupled Axial and Transverse currents (I) (CATI) method, as an efficient and accurate finite element approach for modelling the electric and magnetic…
An Open-Source 3D FE Quench Simulation Tool for No-Insulation HTS Pancake Coils
Sina Atalay, Erik Schnaubelt, Mariusz Wozniak +4
A new module, Pancake3D, of the open-source Finite Element Quench Simulator (FiQuS) has been developed in order to perform transient simulations of no-insulation (NI) high-temperat…
Helicoidal Transformation Method for Finite Element Models of Twisted Superconductors
Julien Dular, François Henrotte, André Nicolet +3
This paper deals with the modelling of superconducting and resistive wires with a helicoidal symmetry, subjected to an external field and a transport current. Helicoidal structures…
Magneto-Thermal Thin Shell Approximation for 3D Finite Element Analysis of No-Insulation Coils
Erik Schnaubelt, Sina Atalay, Mariusz Wozniak +6
For finite element (FE) analysis of no-insulation (NI) high-temperature superconducting (HTS) pancake coils, the high aspect ratio of the turn-to-turn contact layer (T2TCL) leads t…
Finite Element Models for Magnetic Shields Made of Stacked Superconducting Tape Annuli
Julien Dular, Sébastien Brialmont, Philippe Vanderbemden +2
Stacks of high-temperature superconducting tape annuli can be used as magnetic shields operating efficiently for both axial and transverse fields. However, due to their layered geo…
Finite Element Modeling of Power Cables using Coordinate Transformations
Albert Piwonski, Julien Dular, Rodrigo Silva Rezende +1
Power cables have complex geometries in order to reduce their ac resistance. Although there are many different cable designs, most have in common that their inner conductors' cross…
2D Eddy Current Boundary Value Problems for Power Cables with Helicoidal Symmetry
Albert Piwonski, Julien Dular, Rodrigo Silva Rezende +1
Power cables have complex geometries in order to reduce their AC resistance. The cross-section of a cable consists of several conductors that are electrically insulated from each o…
What Formulation Should One Choose for Modeling a 3D HTS Motor Pole with Ferromagnetic Materials?
Julien Dular, Kévin Berger, Christophe Geuzaine +1
We discuss the relevance of several finite-element formulations for nonlinear systems containing high-temperature superconductors (HTS) and ferromagnetic materials (FM), in the con…
On the Stability of Mixed Finite-Element Formulations for High-Temperature Superconductors
Julien Dular, Mane Harutyunyan, Lorenzo Bortot +3
In this work, we present and analyze the numerical stability of two coupled finite element formulations. The first one is the h-a-formulation and is well suited for modeling system…