wireless power transfer by pcb coil
Dear All, I want to model and simulate a wireless power transfer module. Its application is in microchip implant. The model has two 3D microstrip(PCB with substrate) coil. One for transmitter and the...
View ArticleUsing both pressure point and outlet with Pressure, no viscous stress?
Hi! I'm working with natural and forced convection with the aim to design a ventilation/heating system for my master's thesis. I'm wondering if I need a "Pressure Point Constraint" if I'm using an...
View ArticleHeating Circuit
Hello, I am modeling a model very similar to heating circuit in the model library of Comsol 4.3a (physics are electric current shell, shell and thermal stress). The only differences are dimensions and...
View ArticleEquation Based Modeling in structure mechanics
Hi All, While solving equation based structure mechanics problem i encountered the following error message- - Undefined value found. - Detail: Undefined value found in the stiffness matrix. -There are...
View ArticleError: 7161 The mass matrix is zero - resolve
Respected sir/ma'am, I am trying to simulate a Nano ElectroMechanical Switch(NEMS) using the following modules:a)solid, stress-strain, b) Moving Mesh, and c)Electrostatics. When i run the solver, it...
View ArticleProlonged error with "Last Time Step Not Converged"
Dear sir, We were trying out "PIPE FLOW MODULE" as you have suggested. And thanks for the advice, as it has reduced the number of mesh elements to a larger extent. But, we were getting a consistent...
View ArticleHow can I find the flow velocity of a specific coordinate point
Dear all, I would like to ask how can I find the flow velocity of a specific point (x=105, y=2.5) in my channel (it is shown in the picture). In the graph, if I click at any random point I got 3...
View ArticleAutomatically parameter increasing
Dear friends, I have a simple 2D rectangular model, I want to measure some acoustic properties in my desired frequency range, for specific height of model it's easy, but I want to check a range of...
View Article"Reinitializing GUI" for a long time
Hi, when I solve a PDE, it takes a lot of time. I closed the programme with task manager of windows. When I reopen the file, the programme is "reinitializing GUI" . I wait for almost an hour and...
View ArticleSolve PDE on 1D domain?
Hy guys, I have a problem with solving a PDE based model defined by me, it is not a default template in COMSOL. My problem is that the equation is solved for the time domain, but not for the geometry...
View ArticleTime dependent simulation
Hello Ivar, I need a big favor from you. Its a request since my model is giving weird results. I have worked on it but I need to get the physics right. So I decided to try the time dependent study...
View ArticleHow to combine the Frequency Domain and Coil Current Calculation
Hello everyone, i´m trying to simulate an numerical coil with alternating current. The coil is built with the "Multi-Turn Coil Domain". My coil type is numeric wich requires an additional "Coil Current...
View ArticleCOMSOL in parallel mode: a speedup of 20% using 4 cores?
Hello everyone, I have performed the following experiment. Using the command -np #cores, I have forced COMSOL Multiphysics to use 1, 2, 4 or 8 of the available cores on my computer. I also used the...
View ArticleJava Runtime Environment error
Getting following error, A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x0000003da3efbc6c, pid=6909, tid=46912497239488 # # JRE version: 6.0_20-b02 # Java VM:...
View Articlenegative concentrations with high reaction terms in biokinetic models
Hi, I am using a biokinetic model based on the ASM (activated sludge models) to simulate water contaminant removal in a gravel filter. This kind of models consider the degradation of the influent...
View ArticleIssue: Can not mesh my model
Hello, I am trying to solve the following problem. My model is an electrostatic actuator. The active element is a prestressed cantilever beam made of two layers of Ni. The layers have different...
View ArticlePiezoresistive modeling
Hello all I want to simulate a piezoresistive beam with Comsol. I was looking to find an example of piezoresistive modeling to find out what module they usually use and how are the settings but i...
View Article3D Poisson equation problem coupled with Nernst-Planck equation
I used coupled Electrostatics physics and Transport of Diluted Species physics to simulate this problem. The source term in Poisson equation is the difference between cations and anions. Usually, the...
View ArticleCOMSOL Failing at Simple DE?
I've encountered a very simple problem with COMSOL's eigenvalue solver and I was wondering if anyone else has had the same problem. I'm trying to solve the simplest DE imaginable. I'm trying to find...
View ArticleMagnetic Field Simulation
Hi, i'm currently trying to do a mf analysis of the system in append figure. The four quadrangular structures are coils with a external current applied. I defined all the domain's material and added...
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