Magnetically Sprung Electromagnetic Generator
Hi guys, I have built a magnetically sprung electromagnetic generator for harvesting energy from machine vibration. Its basically three magnets in a tube, one fixed at either end and one floating in...
View ArticleUniform Magnetic field?
Hi everyone, I am wondering how I can generate a uniform magnetic field in Comsol. Basically, I want to simulate a metal particle moving in this uniform field. Now I am thinking put all the particles...
View ArticleEffect of sound pressure on refractive index/density
Hello fellow Comsol users, Most of my experience comes from structural mechanics and fracture and would like to ask a little help regarding pressure acoustics. The presence of high and low pressure in...
View ArticleIssue importing ipt files from Inventor with the CAD module
Hi, I can't seem to import a simple IPT cad file (that has a helix built in) from inventor, the import module gives me an error back saying: Not a valid ENTITY type for this operation - Detail:...
View ArticleMoving mesh 2D
Hello, I am trying to simulate the moving boundary for a 2D geometry. I started with a simple 2D geometry where 1 boundary is moving in the x-direction and 1 boundary in y-direction, but because the...
View ArticleMeshing a surface with an interior point
I need to apply a point force on a point inside a shell surface. For this purpose I draw a point in geometry section. However, because of that point I can't mesh the surface with free quad or mapped....
View ArticleTaylor Hood or Crouzeix -Raviart element
Hello all I am using COMSOL for solving the velocity and concentration field. I am using quadratic elements. But I don't know what kind of quadratic elements COMSOL uses. Is it a Taylor Hood or...
View Articleapplying a periodic biphasic square waveform to a surface electrode
Dear friends, I want to apply an AC voltage/Current to a surface electrode placed on the human skin. I need a periodic waveform with unequal on and off time. How can I apply this stimulation pulse to a...
View ArticleWhy is the gradient of the voltage potential field not equal to the electric...
Hi, I have been working on a 3D model of a resistive current sensor, and I am trying to verify the high frequency (50-500Mhz) response. Essentially, i want to make sure that at a fixed current...
View ArticleMoving Mesh - Thermal stress coupling
Hello to all, I need to perform an RF frequency domain analysis on a waveguide which has been previously deformed by a Thermal Stress stationary analysis. In order to do this, I need to calculate the...
View ArticleSplitting one Geometry in two
Hello, Iam a newy in working with comsol Multiphysics and would be very glad if I could find some help in this forum for my problem. I would like to define two different materials in one geometry. You...
View ArticleBatch Processing sj
Dear Engineers/Scientists I am trying to simulate time dependent study a diaphragm with piezo actuator fixed from its periphery and want plot Voltage Vs deflection and also frequency Vs deflection...
View ArticleIonization of air.
Hello. I have a model that comprises a container filled with air. From the outside there are two coils number of turns 1e6 supply current is 1e3 A in the container are two electrodes voltage + - + e7 V...
View ArticleBase vector coordinate system
I am modeling the anisotropic behavior of a plate that have fibers oriented in different directions. For this purpose, I am using the structural mechanics feature. I am orienting my fibers using a...
View Articleparameter sweep error when loading a geometry
I am applying a load to the top of the geometry shown while the bottom is fixed but i keep getting an empty parameter sweep error can u help me??
View ArticleFluid structure interaction and damping ratio
Hello, My model is a vascular cantilever beam (the first mode is pictured below). I work simultaneously on COMSOL and on my experiments. The channel is to be filled with a silicone fluid which will...
View ArticleMathematical particle tracing: Diffuse scattering wall condition
In Comsol 4.3a the diffuse scattering boundary condition is incorrect. it generates an angular distribution with respect to the surface normal of cos(theta), while the correct distribution is...
View ArticleCylinder section modelling
Hello all I wish to model structural mechanics in a section of a cylinder-like geometry consisting of longitudinal bars and radial rigid hoops supporting the bars. The full cylinder is too memory...
View Articlegenerating the graph
I am designing a model of saw resonator and i want to see the admittance vs frequency graph but i dont know how to generate this graph , i am new to comsol . please help.
View ArticleError linking Heat Transfer in Fluids and Turbulent Flow (Spalart-Allmaras)
I am using COMSOL Class Kit 4.1 to model a pretty simple flow of hot air in a vertical pipe. I was able to get the model to working using Laminar flow (all are steady state studies) and the Heat...
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