Parameteric vs. Batch vs. Cluster sweeps
Hi, I have a time-dependent model and I would like to sweep through a range of values of one of the model parameters. The problem is an 'embarrisingly parrallel problem' and very much similar to the...
View ArticleEddy_Currents_In_PM
Dear all COMSOL experts, I am simulating a Synchronous Surface Mounted Permanent Magnet Machine. My aim is to estimate the eddy currents within the permanent magnets placed on the rotor surface, since...
View ArticleSmall time step & slow solving process
Hi I'm building a 2D, time dependent model relating to Solid Mechanics/Heat Transfer in Solids/Coefficient Form PDE. They are coupled by the thermal expansion and swelling of the solid. The creep...
View ArticleCalculate surface area in which a specified temperature limit is exceeded
Hi, I have calculated the time-dependent joule-heating of a structure, now I like to calculate the surface area in which a specified temperature limit is exceeded for each time step. Is there any...
View ArticlePN optical modulator
Hello, I am a student in TUD and I have started to work with COMSOL. My task is to model and simulate PN silicon optical modulator. I am using Semiconductor module. I have couple of questions I would...
View ArticleMoving Mesh with Solid Mechanics and Electrostatics
Hi, I am trying to model a capacitive force sensor in COMSOL using solid mechanics and electrostatics physics. The model consists of a nylon spring between 2 silicon capacitor plates that experience a...
View ArticleCalculation of effective material loss (alpha-eff)
I was wondering while doing my undergraduate research that- if there is any way to calculate the effective material absorption loss (alpha-eff) using comsol. I know the equation, but i do not know how...
View ArticleSimulation with a very high Peclet Number
Hi there, I'm working a geothermal problem, when I put the variables to work with the simulation I got a very high Peclet number, then I need to know if it's possible to stabilize the solution, and...
View Articleconvergence issues in cojugate heat transfer problem
Hi, I am trying to solve a conjugate fluid flow and heat transfer problem. The problem has a channel with fluid flowing through it and surrounding media which has some heat sources. I am having issues...
View ArticleTime-Dependent Modal with short initial impulse
Hi @ all, it is possible to perform an Time-Dependent Modal Study with a short initial impulse e.g. a Gaußimpulse? I want to perform an attenuation analysis and start with a forced oscillation because...
View Articlehalbach array 8 magnet
Hej! I made 3D model of Halbach array 8 magnet circular used NdFeB magnetic with 0.5 tesla magnetic strength. Moreover, choose AC/DC module static magnetic field with no current. I am getting error...
View ArticleCalculating of torque
Hi I have COMSOL 4.2a and I'm new in COMSOL. I'm simulating in AC/DC module Switched Reluctance Motor and I need to calculate torque of rotor and build plot of torque depending on angle of rotation. In...
View ArticleUndefined value found
I had great trouble meshing a geometry. After I refined the mesh and was finally able to mesh it, I clicked the compute button. 78 seconds later, I got this message: Undefined value found. - Detail:...
View ArticleErrors in Electromechanical copuling with Nernst-Planck equation
I tried to simulate the electromechanics of polymer-metal actuator (IPMC) with involve ions migration i.e. Nernst-Planck equation. I made 2 components i.e. Studies (time dependent) with identity...
View ArticleThe relative error is greater than the relative tolerance..Error!!!
Iam a newbie to comsol. And Iam learning comsol for my research. I simulated my first simulation and I got the below mentioned errors. Failed to find a solution. The relative error (4.6e+004) is...
View ArticlePeriodic flow condition
Hi, I am confused about how to use the periodic flow condition. I have a long and repeated geometry, and I want to model just one section of it (since it is repeated anyway). Geometry is very simple...
View ArticleWarning sign in "Step 2: Time Dependent" node in COMSOL
Hello guys, I am solving a ODE in COMSOL which is coupled with AC/DC module through the velocity (Lorentz term) in "Magnetic and Electric fields" interface. When I choose "study controlled" in Equation...
View ArticleCan I give different time steps in a solution?
In a single solution, I separate the total time into several time ranges, and I want to set different time steps for different time range, for example, for time range (t1,t2), the time step is dt1, for...
View ArticleTransmission through periodic nano array
Hello all, I am trying to simulate the transmission through the periodic array which is fabricated on ITO coated substrate. According to the theory, this system should give us two peaks one corresponds...
View ArticleParameter estimation
Hello, I want to determine one parameter k1, which is used over the entire domain. However, objective function values should be compared only at a boundary. According to the Optimization user manual, I...
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