This is the computational domain within which we are solving for the magnetic field. First, we can see that there is a cylinder around the coil representing the air domain. There are actually a couple of other assumptions that have gone into solving the above model. The current flow (black arrows) in the wire results in a magnetic field (colored arrows) in the surrounding air region. Based upon these two assumptions, we will say that a reasonable computational model of a coil might look like the image below, which shows a single wire with a single turn as well as the surrounding magnetic field due to the current flow.Ī computational model of a coil with one turn. We also won’t concern ourselves with the wires between the coil and the source, but assume that they are electrically insignificant.
Instead, we will just assume that a device exists that provides a constant voltage, or a constant current.
#Introduction to comsol multiphysics 4.3b how to
We are interested in learning how to model this magnetic field and how it interacts with other objects.įor the purpose of learning coil modeling, we won’t concern ourselves with exactly what is happening within the source itself. This is a vector field, having both a magnitude and direction, and can be computed from Ampère’s law. This problem can be solved using the finite element method as implemented in the AC/DC Module in COMSOL Multiphysics.Īs a consequence of the computed current flow, a magnetic field arises and surrounds the wire. Current cannot flow in or out of the wire anywhere else, so the electric insulation condition is applicable on the remaining boundaries. The magnitude and direction of this current throughout the conductor can be computed from Ohm’s law and the Charge conservation equation, along with a set of boundary conditions.Ī very simple electromagnetic coil connected to a DC voltage source.įor this single wire, we can consider a grounded boundary condition at one end, meaning an electric potential of zero, and a higher electric potential on the other end.
Due to the voltage difference, a current will flow through the wire. Let’s start with a simple example of a conductive wire that is bent into a loop and connected to a constant voltage source, a battery (shown below). How to Model a Basic Coil in COMSOL Multiphysics If your work involves modeling coils, you will need a complete understanding of this topic. Today, we will look into one of the key concepts to keep in mind when modeling coils: closing the current loop.
#Introduction to comsol multiphysics 4.3b software
"There is no other software out there that offers the same accuracy across such a wide array of disciplines."ĬOMSOL Multiphysics 4.3b brings "tremendous enhancements" to features in existing modules, augmenting simulation speed and the capabilities of the entire product suite.One of the most common uses of the AC/DC Module is for modeling electromagnetic coils and the interactions with their surroundings. These new features delivered with the existing COMSOL product suite include enhancements to CAD importing and geometry handling, meshing, solvers, results, physics and productivity tools that offer increased usability and performance throughout the product development process.ījorn Sjodin, Vice-President of Product Management at COMSOL, commented: "With the introduction of these five new modules, COMSOL Multiphysics is able to offer a simulation package that is unique in the industry. In addition, the Semiconductor Module facilitates semiconductor device simulations and the new Electrochemistry Module offers model electrolysis. The latest version of COMSOL Multiphysics, version 4.3b, includes new products such as the Multibody Dynamics Module, which analyses assemblies of rigid and flexible bodies a Wave Optics Module, which simulates electromagnetics wave propagation in optically large structures and Molecular Flow Modules, which models rarefied flow for vacuum systems. The latest version of COMSOL Multiphysics has been launched and includes new application-specific modules and expanded modelling and analysis tools that the company believes are unique to the industry.
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