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## COMSOL Multiphysics

Showing result: 41 - 50 of 87
 The Telegraph EquationThis model examines how telegraph wire transmits a pulse of voltage using the telegraph equation. The telegraph equation models mixtures between diffusion and wave propagation by introducing a term that accounts for effects of finite... Balanced Armature Receiver MotorThe working principles of a generic balanced armature receiver motor are modelled in this system. The AC/DC electrical and magnetic field model is coupled to the structural deformation of the armature in the motor. Eigenmodes of a RoomWhen designing a concert hall it’s extremely important to take the resonances into account. For a clear and neutral sound, the eigenfrequencies should be evenly spread through the registers. For the home stereo owner, who can’t... Heat Transfer by Free ConvectionThis example describes a fluid flow problem with heat transfer in the fluid. An array of heating tubes is submerged in a vessel with fluid flow entering at the bottom. This is a multiphysics model that involves more than one kind of... Hertzian ContactA long elastic cylinder resting on a flat rigid foundation is analyzed. The cylinder is subjected to a uniform load along its top. The contact pressure distribution is compared with the analytical solution How to Use Contour Line in GeometryThis presentation gives instructions on how to export a Contour Plot (single line), re-import it as an Interpolation Curve on a Work Plane in the Geometry, extrude the Work Plane, then Convert to Solid to create two domains separated by... Quadrupole LensJust like optical lenses focus light, electric and magnetic lenses can be used for focusing beams of charged particles. This COMSOL Multiphysics model shows the path of B5+ ions passing through a focusing system of three magnetic... Solution of the Schrödinger Equation for the Hydrogen AtomThis example shows how to compute energy levels and electron orbits for the hydrogen atom. It models the atom as a 1-particle system using the stationary Schrödinger equation. Before solving this problem in COMSOL Multiphysics, the... An Integro-Partial Differential EquationThe heat distribution in a hollow pipe, whose ends are held at two different temperatures, is studied. The outside surface is assumed to be thermally isolated and the inner surfaces have radiation boundary conditions. The role of... Conical Quantum DotQuantum dots are nano- or microscale devices created by confining free electrons in a 3D semiconducting matrix. Those tiny islands or droplets of confined “free electrons” (those with no potential energy) present many interesting...