Simulação de elementos finitos comsol AC DC, Manuais, Projetos, Pesquisas de Engenharia Elétrica

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Electromagnetics Modeling in COMSOL

Multiphysics

The AC/DC and RF Modules

Electromagnetics Modeling in COMSOL

• RF Module
  • High-frequency modeling
  • Microwave Heating
• AC/DC Module
  • Statics and low-frequency modeling
  • Induction Heating
• Plasma Module
  • Model non-equilibrium discharges
• MEMS Module (statics subset of AC/DC Module) - Advanced statics - Electromechanics
• Particle Tracing Module
  • Interaction of charged particles with electromagnetic fields

AC/DC Module Application Examples

Motors & Generators Electronics Inductors

Capacitors Ion Optics and Charged Joule Heating and Induction Heating Particle Tracing

RF Module Application Examples

Antennas

Waveguides and Filters

Radiation Patterns Scattering

Microwave Heating Plasmonics and Metamaterials

Quasi-statics (AC)

t

E

E sin  t  E   t

Statics (DC) Transient

AC/DC Simulations

AC/DC Physics Interfaces - Statics

• Conductive media DC
  • 3D
  • Axisymmetric
  • 2D In-plane
• Electrostatics
  • 3D
  • Axisymmetric
  • 2D In-plane
• Magnetostatics
  • 3D
  • 3D no currents
  • Axisymmetric (two cases dependent on current direction)
  • 2D In-plane (two cases dependent on current direction)

RF Simulations

• Driven
  • Local field excitation
  • External field excitation
• Eigenvalue
  • Cavity resonances
  • Progagating modes

RF Physics Interfaces

• 3D Waves
  • Source driven or mode analysis
• 2D Waves
  • Source driven, eigenfrequency or mode analysis
    • In-plane
    • Axisymmetric
    • Cross-sectional (guided waves mode analysis only)
  • Solve for 1,2, or 3 field components, allows for TE, TM, TEM, and hybrid mode analysis in 2D (hybrid mode = neither TE, TM, or TEM polarization)

General EM Modeling Features

• Frequency-Domain electric field propagation (sinusoidal input)
• Frequency-Domain electromagnetic potential (sinusoidal input)
• Time-domain electric field propagation (pulses and spikes)
• Time-domain electromagnetic potential for sub-wavelength

component design (pulses and spikes)

Electrical Circuit Components

• Electrical Circuit Components can be combined with RF, AC/DC, MEMS, Plasma, and Piezo simulations

Nonlinear Multiphysics, Strongly Coupled

• Bi-directional coupling with heat transfer
• Bi-directional coupling with structural analysis
• Tri-directional coupling for nonlinear thermal stress
• Quad-directional coupling for:
  • nonlinear thermal stress and large deformations with deformable mesh for computation of thermally induced eigenfrequency shifts
• Arbitrary nonlinear couplings, generalizations of the above or other types of physics including fluid flow (MHD/EHD)
• Non-linear power input-heat relationships

Material Properties, Frequency Domain

Materials can simultaneously be:

• complex valued
  • directly type in values as 2.5-j0.1 or exp(-jpi/2*(z+x)) etc. for permittivity, refractive index, conductivity, or permeability
• frequency dependent
• anisotropic
• spatially varying
• discontinuous
• nonlinear in for instance temperature T:
  • Ex: for conductivity, directly type in values as
  • 5e6(1-0.01(T-273.15)) or
  • 5e6exp(-0.01(T-273.15))

Boundary Conditions, Frequency Domain

Arbitrary excitation shapes, including:

• truncated gaussian
• rectangular
• mathematical expressions
• measured – look-up table based
• complex valued
• computed mode shapes for arbitrary cross-sections
• frequency dependent
• spatially varying
• discontinuous

Boundary Conditions, Time Domain

• Arbitrary excitation shapes, including:
  • truncated gaussian
  • rectangular
  • measured – look-up table based, over space and time
  • computed mode shapes for arbitrary cross-sections
  • switched/pulsed
  • nonlinear
  • time-varying
  • spatially varying
  • discontinuous