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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...

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Time-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...

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halbach 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...

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Calculating 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...

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Undefined 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:...

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Errors 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...

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The 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...

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Periodic 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...

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Warning 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...

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Can 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...

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Transmission 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...

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Parameter 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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CUDA 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...

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Help 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...

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cluster 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...

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inserting 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/.

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How 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...

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How 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...

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Restart 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...

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cell 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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