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14 HitsProducts 136 HitsCOMSOL Blog 193 HitsApplication Gallery 19 HitsUser Story Gallery 3 HitsVideo Gallery 3 HitsKnowledge Base 1037 HitsTechnical Papers and Presentations 2 HitsCertified Consultants 16 HitsMultiphysics Cyclopedia 0 HitsEvent Calendar 0 HitsCareers 12 HitsLearning Center
Steady Currents, Theory Electromagnetics Steady Currents Conservation of Currents Conservation of currents is a fundamental law of nature and is represented in equation form as (1) where is the current density vector and is the space charge density.In the important special case of steady currents, or direct currents (DC), it holds that (2) Accordingly, the equation for direct currents is (3) This equation is mathematically similar to the equation for electrostatics in free space.
Multiphysics Cyclopedia -
www.comsol.com/multiphysics/steady-currents?parent=electromagnetics-072 ...
This effect is typically important in a rotating streaming flow generated by a combination of two resonances, generating a rotating acoustic wave. Lagrangian Steady Velocity Variables in Acoustic Streaming New predefined variables have been added for the Lagrangian steady velocity when modeling acoustic streaming.
Products -
www.comsol.com/release/6.2/acoustics-module
Fast New Solver for Electric Machinery For nonlinear time-periodic problems, it is now possible to solve for the steady-state conditions directly using the new Magnetic Machinery, Rotating, Time Periodic interface. The approach saves a considerable amount of computation time, since the alternative would be to run a time-dependent problem until the periodic steady state has been reached. Furthermore, this approach gives direct access to frequency-domain content (higher-order harmonics), for use in advanced multiphysics contexts.
Products -
www.comsol.com/release/6.2/acdc-module
The example shows a 1D steady-state thermal analysis including radiation to a prescribed ambient temperature.
Application Gallery -
www.comsol.com/model/266
This example shows a 2D steady-state thermal analysis including convection to a prescribed external (ambient) temperature.
Application Gallery -
www.comsol.com/model/265
The model, taken from a NAFEMS benchmark collection, shows an axisymmetric steady-state thermal analysis. As opposed to the NAFEMS benchmark model, we use the temperature unit kelvin instead of degrees Celsius for this model.
Application Gallery -
www.comsol.com/model/453
Because the time scale of gas flow within the landfill isn’t remarkable, the gas flow can be approximated as a quasi-steady state, and in this case gas flow is calculated by stationary interface.
Technical Papers and Presentations -
www.comsol.com/paper/30993
Thus simulations of transient developments do not require an artificial initialization phase to obtain an approximation of the steady state. Also a pre-run for direct solution of the steady state, as alternative to transient initialization, becomes obsolete.
Moreover the analytical steady state solution can be used as a reference to compare transient deformations during the simulation.
Technical Papers and Presentations -
www.comsol.com/paper/52151
Previously reported microheaters at COMSOL® conferences have shed light on microheaters’ thermal properties, optimized geometries and power consumption—all based on steady-state analysis. In this work, we additionally report transient analysis, i.e., thermal transient response of a microheater to study the time required for a microheater to reach the intended operating temperature.
Technical Papers and Presentations -
www.comsol.com/paper/66141
The results show that the pipe spacing and the heat capacity ratio play an important role in the transient behavior of the BHE internal resistance, whereas the pipe spacing and the conductivity ratio play an important role in the steady value of the BHE thermal resistance.
Technical Papers and Presentations -
www.comsol.com/paper/18885
The manual syringe was assumed to have a constant pressure, and thus was modelled in steady state. The auto-injector was modelled in a transient state that had a changing inlet pressure over time due to assuming a spring force.
Technical Papers and Presentations -
www.comsol.com/paper/51122
When a tree branch touches overhead cables and causes a momentary short circuit, your lights may flicker. A device called a recloser ensures that power to your home is not cut off for a longer period.
ABB AG, a leading manufacturer in power technology, is working towards designing a more reliable recloser.
User Story Gallery -
www.comsol.com/story/16429
The steady-state non-equilibrium distributions of two species of mono-valent ions around a charged nanofluidic channel have been examined.
Technical Papers and Presentations -
www.comsol.com/paper/5418
Finite element modeling of three phase three limbed transformer requires solving of field and circuit variables simultaneously. The accurate modeling thus obtained could predict asymmetry in magnetizing current of three phases due to asymmetry in core of three limbed transformer.
This work includes circuit field coupling using COMSOL Multiphysics’ ACDC module.
Technical Papers and Presentations -
www.comsol.com/paper/14933
In this work, the fluid flow over a 2D backward-facing step is analyzed in order to provide a case study for the use of different models for the blood dynamic viscosity in COMSOL Multiphysics. Three non-Newtonian models, as well as the Newtonian model are used to study the shear stresses and the reattachment length as a function of the fluid speed. The non-Newtonian models used in this study are the Carreau model, the power law model, and one of its variants, the Walburn-Schneck model.
Technical Papers and Presentations -
www.comsol.com/paper/6540
Simulation models for steady state thermal hydraulics analyses of ORNL’s HFIR have been developed using COMSOL.
Technical Papers and Presentations -
www.comsol.com/paper/12967
A 3D model of a magnetic rotor both rotating and translationally moving at high-speed over a conductive guideway is modeled in steady-state using the convective A*-Φ formulation.
Technical Papers and Presentations -
www.comsol.com/paper/6387
This paper presents steady and unsteady computational results obtained from numerical solutions of the full two-dimensional governing equations for annular internal condensing flows in a channel.
Technical Papers and Presentations -
www.comsol.com/paper/15617
An FEA model of a steady state thermal interface material characterization apparatus was created in COMSOL Multiphysics 4.2a. This model was then fitted using three convection heat loss coefficients and the conductance of the TIM layer to a set of experimental measurements made using a steady state apparatus. It was shown that the model successfully matched the measured temperature values and the TIM conductance determined using the one dimensional assumption in the case which was examined.
Technical Papers and Presentations -
www.comsol.com/paper/13070
Current transfer from high-pressure arc plasmas to thermionic cathodes may occur in a diffuse mode, when the current is distributed over the front surface of the cathode, or in a spot mode, when most of the current is localized in one or more small areas.
Spectra of perturbations of 3D steady-state current transfer to thermionic cathodes of a high-pressure argon arc have been computed in the framework of the model of nonlinear surface heating.
Technical Papers and Presentations -
www.comsol.com/paper/5322