Quantcast
Channel: Latest Discussions - COMSOL Forums
Browsing all 26447 articles
Browse latest View live
↧

[Please help] Magnetic-structural coupled analysis, result not good,model...

This is part of my thesis. I'm trying to simulate the magneto-structural coupled analysis on a magnetic gear. The attached file is partial of the model. If you have any advice, please see the model and...

View Article


Using a Gaussian Pulse

Hi everyone, I'm actuallay working on a modeling of a laser pulse which is heating a front of a material in order to determinate the diffusivity, my current issue is that i would like to model my heat...

View Article


Inlet outlet mass flux is not identical

Hi all, I am trying to measure the bulk temperature, but initial testing on the conservation of mass failed as it gave me different results between the inlet and the outlet mass flux. This result makes...

View Article

Port to use for semi rectangular shaped coaxial cable excitation

Hi I am facing problem in assigning port parameters for semicircular coaxial cable excitation. If it is circular then can use coaxial port type also if rectangular coaxial port we can use rectangular...

View Article

Charge induction in semiconductor

Hi, I want to simulate the movement of a cloud of electrons in an electric field, through a semi-conductor material. I used the COMSOL Electrostatics module to calculate the electric fieldlines. Now, I...

View Article


Approach to a multiparticle system: Bacteria in medium

Hi everybody, I have recently started a bioinformatics project at university. It is about cooperation of bacteria so I want to deal with a large number (1000+) of objects in medium producing proteins...

View Article

PML Error: Could not find any cartesian regions

Hi I am new to PML. I am using Structural mechanics module to implement PML in a cantliver to determine the waves propagating to the PML. I am getting this error: Could not find any cartesian regions....

View Article

Properties of N- Octadecane on Comsol thermal

Hello, I with the test similer Comsol software equation heat transfer of a brick containing a phase change material (N-0ctadecane) under varying conditions. I want help on how to report the...

View Article


How to set boundary conditions?

I'm new to COMSOL. Where can I find the options for setting up boundary conditions for a model? I need scattering boundary.

View Article


defining output variable of an interface as dependent variable in global...

I am trying to simulate surface deformation due to magnetic field. My model consists of a cylinder filled with conductive fluid surrounded by a single coil (approximated by a line element). I coupled...

View Article

Two-phase flow physics

Hi there, I have experience dealing with CFD problems with the finite volume method. I use my own code, starccm+ and openFOAM very often. I am trying to make some animations with a multiphase flow for...

View Article

modeling of Diffusion

Hi, I want to model a simple mass diffusion process, but with a concentration dependent diffusion coefficient. In variable I defined a function for diffusion coefficient. but when I want to solve the...

View Article

Meshing problem for coaxial cable with helical inner conductor

Hi Good day. I am using a coaxial geometry which has helical inner conductor and cylindrical outer conductor. I am also using emw physics.while simulating/mesh generating I am getting error which...

View Article


vertical exaggeration

Hi all, I'm trying to change the views of my 2D plot in order to have a vertical exaggeration (1:4). I've tried to play with the lock aspect ratio but it seems the model is squeezed into a cube-like...

View Article

Prescribe number of Meshing Elements

Good day, for a model of simple geometry (sphere) and fixed volume, is there a way to define a specific number of meshing elements? I am trying to solve my system with a specific number of elements and...

View Article


electrohydrodynamic problem

Hi all, I'm currently simulating the electromechanical effects of water droplets under both AC and DC voltages. The water droplet is placed between an energized and grounded electrode on an insulating...

View Article

Generation of thicker boundary layer mesh

Hello guys I wanna make some think boundary layer meshes. In my simulation, the boundary layer thickness delta is so big in that Re_x = 9.8 and delta = 5.0x/sqrt(Re_x). So I think the boundary layer...

View Article


Permanent magnet machine modelling!

I am simulating a permanent magnet generator, in 2D Comsol, 'emqa', 'ALE' mode. But there is a problem concerning magnetic circuit saturation as the followings: - My programs are convergent with linear...

View Article

How to find what "compute differential" documentation

When I am plotting a Nyquist plot, I came across this option "Compute differential" under "Expression evaluated for:" option. I just don't know what this means. But instead of asking what it is, I want...

View Article

Error: 'Non Linear Solver did not converge'

Hi, I am working a a 2D model of a rotating machine. I am using the material soft iron (without losses) from the ACDC material library. Every time I use the HB curve as the magnetic field constitutive...

View Article
Browsing all 26447 articles
Browse latest View live