PN 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 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...
View ArticleCUDA and COMSOL
Dear all, I have a new NVIDIA Quadro GPU and I would like to use it to accelerate my simulations, is it possible to use it somehow? I looked for some informations and it seems to me that CUDA it's...
View ArticleHelp with simulating condensation from a partially filled closed glass vial...
Hi! I am having trouble with a condensation simulation. A closed glass vial at ambient temp is partially filled with 10 degC water. When it is put in a cold room with temp of 5degC, condensation...
View Articlecluster computing
Hello, Can anyone help me figure out these errors andor how to run a very large model on multiple nodes? I am having a terrible time trying to run a very large model on multiple nodes on our cluster. I...
View Articleinserting equations
how will insert equations in the comsol electric current model and compute the polarization of a ferroelectric capacitor. the equations appear in the paper. www.comsol.com/papers/8729/.
View ArticleHow to use Two Different Times steps in Solver Parameters?
Dear Sir, I am using COMSOL 3.5a. And I am running my simulation for 6hrs. But I want to run my simulation in two different time parts. (i.e. for 1hr i used solver parameters for time stepping range is...
View ArticleHow can we determine magnetic field of a current carrying wire with finite...
Hi dear all users How can we determine magnetic field of a current carrying wire with finite length, and how it is possible to simulate it in time dependent domain in COMSOL. To simulate and obtain the...
View ArticleRestart simulation with particles already in the domain
Hello there, I have another question regarding the particle tracing module. I have a model consisting of a Laminar Flow (chns) and a Particle Tracing for Fluid Flow (fpt) interfaces. Assume that I...
View Articlecell Reynold number
Dear all, I have some confusion regarding cell Reynold number option provided in COMSOL post-processing. What I understand is that cell Reynold number is calculated with velocity and length within/from...
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