Force between two fixed magnets
Hi, I am having trouble understanding the force calculation between two permanent magnet in COMSOL. My attached model can find the force but this force is different from the analytical expression for...
View ArticleHelix (nonlinear magnetic) under Homogeneous Magnetic Field (Convergence...
Dear Sir, I saw that you've been answering a lot of these questions in the COMSOL forums, and was wondering if you could solve me the following problem, since I've been fighting with it for days with...
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 ArticleCOMSOL error
Hi, When I do the coupling calculation for laminar flow module and transport and diluted species module (concentration), it always shows an error: Undefined value found. - Detail: Undefined value found...
View ArticleLaminar Flow in Mixer Tank
Dear Sir, I am trying to simulate a mixer tank with impeller (cubic tank with center impeller with four blade rotating around z-axis). I am using "Rotating Machinery, Laminar Flow (rmspf)" to simulate...
View ArticleMultigrid failure during solver
Hey all, I'm working on a 3D model of a microfluidic system using the laminar flow (spf) and transport of diluted species (chds) physics models. I've got everything modeled with all the physics...
View ArticleUndefined value found in the equation residual vector.
I am trying to model a pem fuel cell. Although I have entered all parameters and values, i have some errors as follows; Undefined value found. - Detail: Undefined value found in the equation residual...
View ArticleRecoverable error in residual, but solver could not recover.
Recoverable error in residual, but solver could not recover. What is the meaning of this error ?
View ArticleConvergence plots
Does anyone know if it is possible to show a convergence plot during a livelink with Matlab? I'm using version 4.4 and matlab R2013a. Thanks
View ArticleElectric contact pair
Hi everyone, I have a problem with my quite simple simulation. It is about a MEMS thermal actuated switch which should close and put in contact two biased electrodes. The problem is that the simulation...
View ArticleParametric sweep solution is lost after non-convergence
Hi, I'm running a time-dependent simulation, using electric currents and solid heat transfer physics. I'm ramping up the current with time, which heats the material. I have included an effect, which...
View ArticleMonte carlo+Optimization
Hi all, Does anybody used Monte carlo simulations for their optimization model? Is there any tutorial about doing optimization by using monte carlo in comsol? As far as I know from COMSOL4.3a, they...
View ArticleHeat dissipation in a plasmonic nanostructure using pulsed laser
I am trying to generate a model where I can look at the heat dissipation in a plasmonic structure when irradiated by a ns pulsed laser. I have managed to make a model where I can solve the emf...
View Articleinverted mesh element near coordinate
Hi dear IVar I want to see the mechanical changes due to flow of current through two parallel wires in COMSOL. To do this, first I used two "magnetic field" and "solid mechanic" modules. After getting...
View Articleinverted mesh element near coordinate
Hi dear all I want to see the mechanical changes due to flow of current through two parallel wires in COMSOL. To do this, first I used two "magnetic field" and "solid mechanic" modules. After getting...
View Articleinverted mesh element near coordinate
Hi dear Sergei I want to see the mechanical changes due to flow of current through two parallel wires in COMSOL. To do this, first I used two "magnetic field" and "solid mechanic" modules. After...
View Articleultrasonic testing of steel by normal probe- wall echo
Hi, I am trying to simulate ultrasonic testing of steel by normal probe. A 2D model was built. The probe is defined as Lead Zirconate Titanate(PZT-5H) and generates a sine wave to the steel. Is there...
View ArticleSolving drift-diffusion and current continuity simultaneously
Hallo comsol forum !!! I am new to comsol and I would appreciate any of your help! I am trying to solve this drift-diffusion equation d(nd)/dt = div(D*grad(nd) - v*nd) + G (G is the generation rate),...
View ArticleHow can we determine magnetic field of a current carrying wire with finite...
Hi dear Magnus Olsson I wanted to simulate a time dependent current carrying wire for determining magnetic field around the wire. So in the first step, I simulated my wire in mfh, and feed time...
View Articleinverted mesh element near coordinates
Hi dear lvar, Thank you for your kindness actually I did some of your suggestions on my simulation and I found some errors in my simulation. so I want to share them with you: before I explain step by...
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