scholarly journals Progressive Current Source Models in Magnetic Vector Potential Finite-Element Formulations

2016 ◽  
Vol 52 (3) ◽  
pp. 1-4 ◽  
Author(s):  
Patrick Dular ◽  
Patrick Kuo-Peng ◽  
Mauricio V. Ferreira da Luz ◽  
Laurent Krahenbuhl
Keyword(s):  
Finite Element ◽  
Vector Potential ◽  
Current Source ◽  
Magnetic Vector Potential ◽  
Magnetic Vector ◽  
Source Models ◽  
Finite Element Formulations

Effects of 3D Eddy Current Finite Element Formulations on ECT Signals

2006 ◽  
Vol 321-323 ◽  
pp. 464-467
Author(s):  
Hyang Beom Lee
Keyword(s):  
Finite Element ◽  
Eddy Current ◽  
Vector Potential ◽  
Nuclear Power ◽  
Scalar Potential ◽  
Gauge Condition ◽  
Magnetic Vector Potential ◽  
Magnetic Vector ◽  
Special Assumption ◽  
Finite Element Formulations

To obtain the simulated eddy current testing (ECT) signals of steam generator (SG) in nuclear power plant (NPP), nodal-based finite element (FE) analysis with magnetic vector potential (MVP) is usually used. To perform the numerical analysis, we derive the governing equation in terms of MVP and electric scalar potential (ESP) from Maxwell’s equations. To insure the uniqueness of solution, gauge condition has to be considered. In eddy current problems, Coulomb gauge condition (CGC) is usually used. In 2-D or 3-D axis-symmetric analysis, CGC is included during formulation and ESP is eliminated using some special assumption. Because CGC is not used during the formulation in 3-D analysis, we have to include artificially. And because of the heavy computation cost for 3-D analysis modified magnetic vector potential (MMVP) is used by elimination ESP. In this paper, effects of artificial treatment of CGC and elimination of ESP on ECT signal are investigated in order to help for obtaining accurate numerical simulation results.

Using Reduced Support to Enhance Parallel Strong Scalability in 3D Finite-Element Magnetic Vector Potential Formulations with Circuit Equations

2016 ◽  
Vol 36 (6) ◽  
pp. 400-408
Author(s):  
Eelis Takala ◽  
Evren Yurtesen ◽  
Jan Westerholm ◽  
Juha Ruokolainen ◽  
Tommi Peussa
Keyword(s):  
Finite Element ◽  
Vector Potential ◽  
Magnetic Vector Potential ◽  
Magnetic Vector ◽  
3D Finite Element

Heat Transfer Model for an RF Cold Crucible Induction Heated Melter

2003 ◽  
Author(s):  
Grant Hawkes ◽  
John Richardson ◽  
Dirk Gombert ◽  
John Morrison
Keyword(s):  
Vector Potential ◽  
Current Source ◽  
Melting Process ◽  
Transfer Model ◽  
Magnetic Vector Potential ◽  
Cold Crucible ◽  
Magnetic Vector ◽  
Primary Coil ◽  
Melt Temperature ◽  
Experimental Apparatus

A method to reduce radioactive waste volume that includes melting glass in a cold crucible radio frequency induction heated melter has been investigated numerically. The purpose of the study is to correlate the numerical investigation with an experimental apparatus that melts glass in the above mentioned melter. A model has been created that couples the magnetic vector potential (real and imaginary) to a transient startup of the melting process. This magnetic field is coupled to the mass, momentum, and energy equations that vary with time and position as the melt grows. The coupling occurs with the electrical conductivity of the glass as it rises above the melt temperature of the glass and heat is generated. Natural convection within the molten glass helps determine the shape of the melt as it progresses in time. An electromagnetic force is also implemented that is dependent on the electrical properties and frequency of the coil. This study shows the progression of the melt shape with time along with temperatures, power input, velocites, and magnetic vector potential. A power controller is implemented that controls the primary coil current so that the power induced in the melt does not exceed 60 kW. The coupling with the 60 kW generator occurs with the impedance of the melt as it progresses and changes with time. With a current source of 70 Amps (rms) in the primary coil and a frequency of 2.6 MHz, the time to melt the glass takes 0.8 hours for a crucible that is 10 inches in diameter and 10 inches high.

The Analysis of Pressure Capability of Different Teeth Structures in Ferrofluid Seal

2010 ◽  
Vol 146-147 ◽  
pp. 1278-1284 ◽  
Author(s):  
Fei Fei Xing ◽  
De Cai Li ◽  
Wen Ming Yang
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Finite Element ◽  
Theoretical Model ◽  
Vector Potential ◽  
Potential Method ◽  
Magnetic Vector Potential ◽  
Magnetic Vector ◽  
Two Sides ◽  
Sealing Gap

Theoretical model of calculating magnetic field of typical ferrofluid sealing structures with magnetic vector potential method is built. Based on the theoretical model, magnetic field distribution of rectangular teeth, two-sides dilated shape and one-side dilated shape teeth structures with common other conditions were calculated using finite element method when the sealing gap was 0.1mm and 0.12mm. The comparison of their results with the same sealing gap showed that one-side dilated shape teeth structure had higher pressure capability than other shape teeth under reasonable design.

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