H-ϕ formulation in COMSOL Multiphysics for simulating the magnetization of bulk superconductors and comparison with the H-formulation
by administrator on Mar 15, 2024 1:49:01 PM
These models use the H-phi formulation to efficiently calculate the magnetic field produced by a superconducting bulk magnetized by zero field cooling in a uniform magnetic field. The models are created in COMSOL Multiphysics 4.3b and COMSOL Multiphysics 5.5 in order to be more access …
T-A multi-scale and homogeneous models for benchmark #3
by administrator on Mar 15, 2024 1:31:56 PM
These two models address the analysis of the Benchmark #3, a 20 HTS tapes stack. The models show how the multi-scale and homogeneous methods are adapted to be used in conjunction with the T-A formulation. The achieved simplification in the description of the system allow to reduce the …
T-A formulation for modelling 2G HTS stacks
by administrator on Mar 15, 2024 1:24:41 PM
Impressive work Nothing else matters Impressive work Nothing else matters The model shows how to use the thin strip approximation for the superconducting coated conductors to speed up calculation. The model simulates the magnetisation of a 2G HTS stack. The T formulation is used for m …
Mixed A- and H- formulation for modeling electrical machines with superconducting windings
by administrator on Mar 15, 2024 1:20:57 PM
The model uses the H-formulation for the superconducting windings and the A-formulation for the non-superconducting parts. Two important lines are defined: the “tramodel” lines, which separates the two formulations, and the “rotation” line, which separates the fixed and rotating parts …
Modeling and simulation of termination resistances in superconducting cables
by administrator on Mar 15, 2024 1:13:58 PM
The models presented here are used to simulate termination resistances which are largely responsible for the uneven distribution of currents in superconducting cables [1]. For this purpose, four different models are presented. The first is a 0D stationary model, where time enters as a …
Superconducting magnetic bearing composed by a permanent magnet and bulk HTS sample
by administrator on Mar 15, 2024 1:11:12 PM
In the considered examples, the HTS sample is either a bulk superconductor or stacks of 2G wires. In the second case, the 2G stack was homogenized in order to speed up the solution. The movement between the HTS and the permanent magnet is avoided in the model by restricting the simula …
2-D electro-thermal model for simulating non-uniform quench in 2G HTS coated conductors
by administrator on Mar 15, 2024 12:57:24 PM
The model calculates the time evolution of the electric potential and the temperature in a 2G HTS CC when a transport current is applied in presence of a low Jc region (defect) in the tape. The heat generated at the defect location creates a normal zone that propagates along the tape. …
Full 3-D time-dependent electromagnetic model for Roebel cables
by administrator on Mar 15, 2024 12:51:19 PM
This model was shared by V. Zermeno, Karlsruhe Institute of Technology. This model simulates the current distribution in the superconducting layers of a Roebel cable composed of 14 strands and estimates its AC losses. The mode is rather general and allows considering the cases of curr …
2-D axisymmetric and 3-D models for magnetization of superconducting bulks
by administrator on Mar 15, 2024 12:42:20 PM
Magnetic vector potential Current density distribution This model was shared by M. Ainslie, University of Cambridge. The first model is for a 2D axisymmetric bulk with zero field cooling (ZFC) magnetization. Here, the external magnetizing field is applied along the z axis – perpendicu …
3-D homogeneous model to estimate AC losses in coated conductor stacks and coils
by administrator on Mar 15, 2024 12:18:58 PM
This model was shared by V. Zermeno, Karlsruhe Institute of Technology. This model uses a homogenization technique to calculate the current distribution inside the superconducting layers of a racetrack coil and to estimate its AC losses.
