3-D H-formulation for superconducting wires and the Gmsh cohomology solver
by administrator on Mar 21, 2024 3:23:10 PM
This model was shared by C. Geuzaine, University of Liège.
Analytical model for AC losses in HTS tapes
by administrator on Mar 20, 2024 2:49:29 PM
This model was shared by João Fernandes, Instituto Superior Técnico, Ulisboa. This work proposes two alternative analytical models to evaluate the AC losses of High-Temperature Superconducting (HTS) tapes during their hysteretic and resistive modes. Two analytical models are proposed, …
3D COMSOL model for CORC cables
by administrator on Mar 20, 2024 2:47:02 PM
This model was shared by Sofia Viarengo, Politecnico di Torino. The model is a full 3D CORC cable: the T-A formulation has been coupled to a thermal module. The model is time-dependent and calculates current density, field distribution, and temperature in the superconductor in presenc …
Python and Matlab codes to model HTS tapes under arbitrary external field and transport current via integral method
by administrator on Mar 20, 2024 2:44:41 PM
This model was shared by Calvin C. T. Chow, The University of Hong Kong. These Python and Matlab codes calculate ac loss of HTS tapes that are under two types of non-uniform external field whilst carrying a transport current. The two types are (1) field created by a point current sour …
Alternative to the H-formulation for critical state simulation in HTS materials
by administrator on Mar 20, 2024 2:41:57 PM
This model was shared by Dong Keun Oh, Korea Institute of Fusion Energy. This model is developed as an attempt of static H-formulation to substitute for the magnetic formulation (A-formulation) of “the self-consistent static critical current model” which has been recognized as an effi …
Fully-staggered array of bulk REBCO short-period undulator: large-scale 3-D electromagnetic modelling and design optimization using A-V and H- formulations
by administrator on Mar 20, 2024 2:38:19 PM
This model was shared by Kai Zhang, Paul Scherrer Institute, Switzerland and Mark Ainslie, University of Cambridge, UK. In this shared model, implemented in ANSYS 2020R1 Academic, the theory of the 2D A-V formulation-based backward computation method is extended to calculate the criti …
COMSOL implementation of the H-ϕ formulation with thin cuts for modeling superconductors with transport currents
by administrator on Mar 20, 2024 2:35:57 PM
These models were shared by Alexandre Arsenault, Polytechnique Montréal, Montréal. These two models use thin cuts with the H-phi formulation in COMSOL Multiphysics 5.5 to efficiently model transport currents in superconducting materials. The magnetic scalar potential is set to be disc …
Modeling of HTS bulks surrounded by magnetic components using the H–φ formulation
by administrator on Mar 20, 2024 2:31:30 PM
These models were shared by Alexandre Arsenault, Polytechnique Montréal, Montréal. These two models use the reduced H-phi formulation to efficiently simulate the magnetic field of a superconducting bulk surrounded by magnetic components. The magnetic field is separated into a source a …
Superconductors for power applications: an executable and web application to learn about resistive fault current limiters
by administrator on Mar 20, 2024 2:28:56 PM
This model was shared by Nicolo Riva, Ecole Polytechnique Fédérale de Lausanne. The model solves a 1-D electro-thermal model of am HTS tape in a resistive fault current limiter, working under AC fault conditions. It evaluates important figures of merit such as the limited current, the …
A-V formulation for numerical modelling of superconductor magnetization in true 3-D geometry
by administrator on Mar 20, 2024 2:23:52 PM
This model was shared by Mykola Soloviov, Institute of Electrical Engineering, Slovak Academy of Sciences. Model file of superconducting cup magnetization in the diagonally oriented external AC magnetic field. The model was saved in the Comsol v. 5.4 without generated mesh and solutio …
Coupled A-H formulation for magneto-thermal transients in HTS magnets
by administrator on Mar 15, 2024 2:07:11 PM
These models were shared by shared by Lorenzo Bortot, CERN. The two models implement a coupled A-H field formulation in FEM, solving for H in the superconducting tapes, and for A elsewhere. The tapes are represented either by means of 2D domains or 1D thin-shells. For the second case, …
New benchmark problem for electromagnetic modelling of superconductors: the high-Tc superconducting dynamo
by administrator on Mar 15, 2024 1:53:53 PM
The high-Tc superconducting (HTS) dynamo has recently been proposed as a new benchmark problem for the HTS modelling community. The benchmark geometry consists of a permanent magnet rotating past a stationary HTS wire in the open-circuit configuration and assumes for simplicity the 2D …
AC losses calculation in REBCO coils or stacks
by administrator on Mar 15, 2024 1:51:04 PM
This model can calculate HTS stack/coil with various applied current and magnetic field. Its greatest advantage is the calculating speed could be very fast. The model is calculated by integration method, which was first proposed by Brandt for HTS tape. Here it is extended to ReBCO sta …
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 …
Open source 2-D finite difference method for the simulation of HTS cables
by administrator on Mar 15, 2024 1:45:54 PM
In this work a two-dimensional open source simulation code based on the finite difference method (FDM) has been developed. It is solved by means of the alternating direction implicit routine (ADI). The algorithm has been written in MATLAB language. The method improves computational pe …
ANSYS APDL codes for modelling the critical state magnetization current in REBCO tape stacks with a large number of turns using the A-V formulation
by administrator on Mar 15, 2024 1:40:00 PM
An iterative algorithm method, based on ANSYS A–V formulation, is developed to simulate the critical state magnetization current Jc(B,θ) in ReBCO tape stacks during the field-cooling magnetization. The computation speed is quite fast because the eddy current is not computed in non-sup …
GetDP Scripts for simulating superconductors and soft ferromagnetic materials
by administrator on Mar 15, 2024 1:37:04 PM
Models based on GetDP as a finite element solver and Gmsh as a mesh generator. The models include an E-J power law for superconductors and an anhysteretic law for ferromagnetic materials. The finite element method is implemented either with an A- or an H-formulation, for tapes, cylind …
MATLAB scripts for simulation of superconductors (tapes, bars and cylinders)
by administrator on Mar 15, 2024 1:34:33 PM
Scripts for Matlab to simulate superconducting strips, bars and cylinders in various conditions of applied magnetic fields and currents. To find the current distribution, an integral formulation known as Brandt’s method is used.
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 …
AC losses in a superconducting magnet in the presence of a time-dependent transport current
by administrator on Mar 15, 2024 1:29:34 PM
This model is based on ANSYS 15.0. The model calculates the AC loss in a superconducting magnet in the presence of a time-dependent transport current. The superconductor is modeled with Bean model. The parameters and outputs are all in text format, can be easily read and modified. Alm …
Effect of tape non uniformities on end-to-end V-I characteristics of superconducting tape
by administrator on Mar 15, 2024 1:27:33 PM
This code evaluates the influence of non-uniformities of (Ic,n) along a superconducting tape, modeled as a series of non-linear resistances, each characterized by its Ic and n. In particular, it calculates the effect of the statistical distributions of Ic and n of these segments on th …
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 …
3-D numerical simulation with the fast Fourier transform of a magnetic shield and a magnetic lens made of a bulk type II superconductor
by administrator on Mar 15, 2024 1:18:51 PM
The method is efficient and can be easier to implement than the alternative approaches based on the finite element methods.
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 …
Superconducting fault current limiter (SFCL) connected to a power system
by administrator on Mar 15, 2024 1:08:33 PM
The model can be implemented in any power system simulator (e.g., Matlab/Simulink, EMTP, PowerFactoy, etc.) for transient analyses of short circuit currents. Here one presents the method applied to MCP-BSCCO-2212 SFCL devices. The method however has already been extended to SFCL based …
Parameter-free method to extract the Jc(B,θ) field-dependence from in-field current–voltage characteristics of HTS tapes
by administrator on Mar 15, 2024 1:00:34 PM
The method presented here allows computing the critical current density (Jc) of superconducting materials from its in-field experimentally measured critical current (Ic). This is particularly important for applications like HTS cables for power transmission and fault current limiters, …
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 …
Self-consistent model to estimate the critical current of superconducting devices
by administrator on Mar 15, 2024 12:47:00 PM
This model was shared by V. Zermeno, Karlsruhe Institute of Technology. The model presented here is used to estimate the critical current of superconducting devices. Its implementation is very simple either using finite-element-based or general numerical analysis programs. The model r …
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 …
2-D Campbell’s model to estimate magnetization losses in a wire in the critical state
by administrator on Mar 15, 2024 12:21:44 PM
Magnetic vector potential Current density distribution This model was shared by E. Rizzo. The model calculates the penetration of the magnetic field in the cross-section of a superconducting wire in the critical state subjected to a transverse magnetic field.
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.
2-D homogeneous model to estimate AC losses in coated conductor stacks and coils
by administrator on Mar 14, 2024 3:41:29 PM
This model was shared by V. Zermeno, Karlsruhe Institute of Technology. The model uses a homogenization technique to calculate the current distribution inside the superconducting layers of a HTS stack where each tape carries the same net current as it would be the case in a coil. The …
2-D H-formulation of Maxwell’s equations with edge elements
by administrator on Mar 14, 2024 3:01:13 PM
This model was shared by F. Grilli, Karlsruhe Institute of Technology and P. Masson, Houston University. The model calculates current density/field distribution in a superconducting wire in the presence of a time-dependent transport current, background field or combination thereof. Th …
Integral equation for thin conductors solved by finite-elements (Comsol)
by administrator on Mar 14, 2024 1:57:25 PM
The model calculates current density/field distribution in a superconducting thin conductors in the presence of a time-dependent transport current, background field or combination thereof (as in the figure below). The superconductor is modeled with a power-law. Dependence of Jc on mag …
