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Electrostatic levitation- simulation of static equilibrium using Comsol (part 1)

10:07

Heat transfer simulation of heat source with fins using Comsol

17:29

Modelling cylindrical permanent magnets with radial magnetization using Comsol Multiphysics

13:49

Simulation of temperature distribution in water-cooled induction heating coil - Comsol Multiphysics

32:32

Computing beam stresses using the beam interface in Comsol Multiphysics

9:53

Computing axial stresses in a truss using Comsol Multiphysics (truss interface)

7:28

Moving mesh- electrostatic levitation simulation using Comsol Multiphysics (part 2)

This tutorial demonstrates the use of a PD controller (from the built-in PID tool in Comsol) to stabilize the levitation of a charged object, which is inherently unstable. This is an application using a feedback control loop and a moving mesh. The output of the controller is used as the input voltage that creates the required electric field.
Instead of using the solid mechanics interface, the displacement of the sphere is calculated using 'global equations'.
Part 1: ua-cam.com/video/KUcHS7KZNRY/v-deo.html
00:00 Introduction
00:58 Global equations
04:28 Moving mesh
05:33 Control variable
06:58 PID controller
11:36 Time solver
14:16 Results
Please subscribe and feel free to ask questions if anything is unclear!

Відео

Electrostatic levitation- simulation of static equilibrium using Comsol (part 1)

10:07

Electrostatic levitation- simulation of static equilibrium using Comsol (part 1)

Переглядів 3 тис.3 роки тому

This tutorial shows a 2D axisymmetric model of a sphere levitating by electrostatic attraction. The sphere levitates between 2 parallel plates. A certain level of electric potential needs to be applied to the top plate such that the electrostatic force exerted on the sphere balances the weight of the sphere. This value is unknown so the 'global equations' feature should be used to compute it. A...

Heat transfer simulation of heat source with fins using Comsol

17:29

Heat transfer simulation of heat source with fins using Comsol

Переглядів 18 тис.3 роки тому

This tutorial shows a 3D heat transfer model of a computer chip (heat source) cooled by fins (heat sink). A stationary study with parametric sweep is used to check the effect of increasing fin length on the maximum temperature of the chip. 00:00 Intro 00:20 Geometry 04:41 Materials 06:35 Physics 11:05 Mesh 11:50 Solution 14:15 Results Please subscribe and feel free to leave a comment!

Modelling cylindrical permanent magnets with radial magnetization using Comsol Multiphysics

13:49

Modelling cylindrical permanent magnets with radial magnetization using Comsol Multiphysics

Переглядів 14 тис.3 роки тому

This tutorial demonstrates how a permanent magnet with a cylindrical shape and radial magnetization can be modelled in Comsol by defining a cylindrical coordinate system. The video shows an example of an array of 8 magnets that is used in some types of DC motors. The "magnetic fields, no currents" interface is used to reduce the model size. You can also use the "magnetic fields" interface. 00:0...

Simulation of temperature distribution in water-cooled induction heating coil - Comsol Multiphysics

32:32

Simulation of temperature distribution in water-cooled induction heating coil - Comsol Multiphysics

Переглядів 15 тис.3 роки тому

This model shows how an induction heating coil can be kept cold by making water flow through it. The coil is supplied with a continuous sinusoidal current input and it heats up due to Joule heating (resistive heating). The steady-state temperature distribution of the coil is obtained. Preventing the coil from heating up is important for safety. The simulation uses 3 physics interfaces (magnetic...

Computing beam stresses using the beam interface in Comsol Multiphysics

9:53

Computing beam stresses using the beam interface in Comsol Multiphysics

Переглядів 3,2 тис.3 роки тому

This tutorial shows how the specialized beam interface in Comsol can be used to compute the stresses and bending moments in a beam without the need to build the beam geometry. This is especially useful if the beam has a complex cross-sectional shape like an H profile. The video also shows how a distributed load can be inserted using a function. If only point loads are used then the beam interfa...

Computing axial stresses in a truss using Comsol Multiphysics (truss interface)

7:28

Computing axial stresses in a truss using Comsol Multiphysics (truss interface)

Переглядів 1,3 тис.3 роки тому

This tutorial shows how the axial stresses and forces in a truss can be computed using the truss interface in Comsol. A 2D truss is shown. The system is discretized using linear truss elements. The solution obtained is exact and can be verified by solving the truss problem by hand using nodal force equilibrium. 00:00 Introduction 00:50 Geometry 02:25 Material 03:00 Physics 05:27 Mesh and Study ...

Modelling a simple transformer and defining custom equations using Comsol Multiphysics

19:29

Modelling a simple transformer and defining custom equations using Comsol Multiphysics

Переглядів 8 тис.3 роки тому

This tutorial shows how a basic step-up transformer can be modelled in Comsol and how to define custom equations which can be used in the model. Physics variables can be used to define equations and you can apply operators such as integration, average, etc. In this example I compute the core loss due to hysteresis (eddy current loss in neglected). Winding copper loss is already defined and calc...

Solving an electrical spice circuit using Comsol Multiphysics

8:07

Solving an electrical spice circuit using Comsol Multiphysics

Переглядів 12 тис.3 роки тому

This tutorial demonstrates how the 'electrical circuit interface' in Comsol can be used to solve for currents and voltages in a spice circuit. Constructing a circuit can be simply done by inserting the desired electrical components and defining the connections by specifying node numbers. Any node numbers can be used as long as the numbering is consistent for all components. The electrical circu...

Brinell hardness test simulation using Comsol Multiphysics

11:34

Brinell hardness test simulation using Comsol Multiphysics

Переглядів 8 тис.3 роки тому

This tutorial shows an example of Brinell hardness test which is used to measure the hardness (resistance to plastic deformation) of materials. Aluminium is used as the test sample and a 2D axisymmetric model is used to simulate the plastic deformation in the sample caused by the mechanical contact stress from the indentor. The Brinell hardness number (BHN) is then calculated using the diameter...

Modelling nonlinear elastoplasticity of a material using Comsol Multiphysics- Structural mechanics

13:55

Modelling nonlinear elastoplasticity of a material using Comsol Multiphysics- Structural mechanics

Переглядів 12 тис.3 роки тому

This tutorial shows a simple example of how non-linear plastic deformation can be modelled using the solid mechanics physics interface. The applied force is gradually increased to a maximum and then reduced to zero. The resulting stress-strain curve is hysteretic due to permanent plastic deformation. The slope of the stress-strain curve when unloading is equal to the slope of the curve in the i...

Moving mesh introduction- domain rotation example in Comsol Multiphysics

10:01

Moving mesh introduction- domain rotation example in Comsol Multiphysics

Переглядів 20 тис.3 роки тому

This Comsol tutorial introduces moving (or deforming) mesh using 2 methods- (a) domain movement that causes deformation of the adjacent mesh elements and (b) domain movement with disconnected mesh that doesn't affect adjacent elements. The 2nd method uses a discontinuous mesh across the domains. This requires a 'Form Assembly' operation in the geometry section to group the domains together with...

Induction heating simulation of an iron bar using Comsol Multiphysics

24:09

Induction heating simulation of an iron bar using Comsol Multiphysics

Переглядів 39 тис.3 роки тому

This tutorial explains the steps for modelling induction heating of a metallic bar. The variation of temperature distribution over time is solved using a 2D axi-symmetric model. This multi-physics problem uses the magnetic fields and heat transfer interfaces in Comsol. Chapters: 00:00 Introduction 01:48 Geometry 03:40 Materials 08:14 Magnetic fields 09:22 Heat transfer 11:16 Materials 12:37 Mes...

Modelling magnetic hysteresis and producing hysteresis loops using Comsol Multiphysics

16:58

Modelling magnetic hysteresis and producing hysteresis loops using Comsol Multiphysics

Переглядів 10 тис.3 роки тому

This tutorial illustrates the steps to model magnetic hysteresis of a ferromagnet within a varying magnetic field. The hysteresis loops are produced via time-harmonic magnetic field that is generated from input current of different amplitudes . The model is 2D axisymmetric and is run in the time domain. Sections: 00:00: Introduction 00:50: Geometry 02:25: Materials 03:43: Physics 08:27: Mesh 09...

Using symmetry in an electromagnetic simulation in Comsol Multiphysics (AC electromagnet)

3:00

Using symmetry in an electromagnetic simulation in Comsol Multiphysics (AC electromagnet)

Переглядів 7 тис.3 роки тому

This tutorial shows how planes of symmetry can be used in a 3D model to reduce the finite element model size and make the simulation faster. Two types of symmetry boundary condition can be used: magnetic insulation when the field lines are tangent to a boundary, and magnetic conductor when field lines are normal to a boundary. This video is a follow-up of the AC electromagnet tutorial. Check th...