Coupling of Electrostatics and Nerst plank equation
Hi, I am trying to solve two equations simultaneously as follows 1) Div(Grad (V)) = - rho/eps 2) Div(D*Grad(C) - Z*u_m*F*C*Grad(V)) = 0 where V is voltage ,rho is space charge density, eps is...
View ArticleModelling Compression of Material at a Rate
Hello, I am a beginner to COMSOL 4.2a and I would like to build a simple model where a material (a cylindrical block of polymer) is compressed at a rate of 10 mm/min. Using Solid Mechanics, I was able...
View Articleelectrospray simulation
Hi, I'm trying to simulate an electrospray experiment using comsol 4.1 in order to see the formation of droplets leaving a needle to a plate. A high voltage is applied on the needle and the plate is...
View Articlehow to plot the velocity profile between any two points in Comsol 4.2
In comsol 3.5, when I want to get the velocity profile from (0,0) to (0,4), I could use postprocessing--> cross section plot parameters --> line plot, then I can input cross section line data....
View ArticleMie scattering in 4.3
Hello, I have already seen some discussion about mid scattering of a gold nanosphere. But I the discussions I have consulted, no one has yet implemented a mie scattering program in Comsol 4.2 or 4.3...
View ArticleHow to use parameters between different physics?
Hello, my name is Wang Jiujiang from University of Macau. I am using COMSOL to simulate a capacitor, after I simulated using DC voltage, I want to add AC voltage. After I add a physics--circuit and...
View ArticleUsing a Probe Value for a Stop Condition
Hello fellow COMSOL users. Can someone refer me to a model or tell me how to solve my problem. In a system undergoing resistive heating I want to use the calculated resistive energy as the stop...
View Articleelectric field remains the same irrespective of the material used!!!!!
Hello friends, Am trying to simulate the electric field between two circular electrodes placed inside a circular dielectric field.Irrespective of the change in circular dielectric material the electric...
View ArticleMicrowave oven waveguide configuration
Hi everybody, I am trying to simulate a microwave oven using COMSOL, but I'm still a bit confused about configuring the waveguide. What is the difference between Transverse Electric (TE) and Transverse...
View ArticleVibration of a cantilever beam
Hi, I am trying to model a beam oscillating under external vibration condition. I have kept one end of the beam fixed. I have tried applying different kind of boundary conditions to solve the problem....
View ArticleConcentration Constrain on Transport of Dilute Species Simulation
Hi, I am doing a simple simulation of ion diffusion and drift using the Transport of Dilute Species module and the Electrostatics module. I was wondering, is there a way to restrict the concentration...
View Articledoes a periodic boundary condition for u implement inflow u (boundary1) =...
Dear everyone, I have a question about the implementation of periodic boundary conditions for fluxes, so that the inflow through one boundary equals the outflow through the other. In comsol 3.5, this...
View ArticleSpecifying a rotating boundary condition
I would like to simulate a rotating wall condition. For simplicity, imagine a square box. On the top surface of that box there is a circle. Inside of the box is a viscous fluid. I would like to impose...
View ArticleFrequency sweep in a magnetic field interface
Hello everyone, This should be seemingly siomple problem. I am trying to model the AC magnetic field due to a coil in 3D. I am using a magnetic field interface on a simple cylinder (acting as the coil)...
View ArticleImplementing weak constraints
Hello, I am trying to implement weak constraints on my boundary using a model coupling integration variable. The idea is that flow at the boundary is determined by change in the area at that time. Here...
View ArticleHow to change the capacity of lithium ion battery
hi, I am trying to run the lithium ion battery 1D isothermal model from model library .The capacity of cell used in the model is 17.5Ah. How do I change this capacity. Thank you Syam TP
View ArticleVariable change with time
I have a question about variable change with time. I try to make a mass transfer model. The inflow concentration change with time. If t <= 1000s then C=1mol/m^3 else C=0 I upload the data and make a...
View ArticleFailed to evaluate variable Jacobian
Hi I simulate the rib waveguide with the sio2 substrate and material of the core Er:Ta2o5 i define the lambda=1550nm in global definition>parameters, and in the step 1:frequency...
View ArticleHigh current output
Hi everyone, I am simulating a heat treatment with the induction heating module and I'm facing a problem concerning the single turn coil. More specific I import as a coil excitation the a power of...
View ArticleCalculating Electrostatic Force without MEMS Module
I've been having difficulty coupling the Electrostatics/Structural Mechanics/Moving Mesh applications. I was previously given advice to look up the MEMS 3D Cantilever Beam model to help me understand...
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