Capillary diffusion and relative permeability
Hi I am using transient two phase darcy law for resin impregnation through a porous material. The porous medium of certain porosity and permeability is being impregnated by resin as it displaces air....
View ArticleRunning big simulation- time step
Hi, I have long data (hourly time step for three years). If I want to run this amount of data,then it takes long time to solve the problem. Is there any way to reduce time calculation in COMSOL? Is it...
View ArticleDetail: Undefined value found in the equation residual vector
Hello Experts, Am trying to solve a packed bed reactor problem am facing this error. Could anyone help me out please? - Detail: Undefined value found in the equation residual vector. There are 3...
View ArticleMagnetic Field of a Multi Layer solenoid
Hello Everyone, I have no experience in using COMSOl. My professor wants me to run an example project in this software and I have a few specific questions. The problem statement is: I have a multi...
View ArticleCantilever beam fracture
Hi Everybody I have a question regarding analysis of deflection of the cantilever beam. As it is clear, If I apply a small force on tip of the cantilever it will deflect. However in simulation I don't...
View ArticleLimiting current from Rotating Disk Electrode - Simulation doesn't match theory
I am having an problem getting a value for the current at an electrode, that is being rotated in solution, that would be expected from theory. The Levich equation (...
View ArticleLimiting current from Rotating Disk Electrode - Simulation doesn't match theory
I am having an problem getting a value for the current at an electrode, that is being rotated in solution, that would be expected from theory. The Levich equation (...
View ArticleHow can i generated DEP force and electric field between two electrode using...
hi, How can i generated DEP force and electric field between two electrode using comsol 4.4?? i already done my design (electrode desing) in 2D...which module should i use electrostatic(es) or electric...
View ArticleSlug flow of Two immsible liquids
Hello, I would like to generate a slug flow in a micro-channel (as shown in the attached image). I have started my model by using the Droplet Breakup Model but I noticed that the droplets started to...
View ArticleVery Urgent: Piezoelectric Filter Lumped Port Problem
Hi I am trying to find the s parameters of a mechanically coupled piezoelectric filter with lumped port. But even though I have defined the perfect conductor, I get this error: Errors during...
View ArticleConvergence problem in time dependent solver
Hi, I'm getting this error when running a time dependent simulation of laminar flow in a micro channel. What I want to do is change the input flow on one arm of a y-channel and follow the response in...
View ArticleCantilever beam fracture
Hi Everybody I have a question regarding analysis of deflection of the cantilever beam. As it is clear, If I apply a small force on tip of the cantilever it will deflect. However in simulation I don't...
View ArticleMagnetic Field of a Multi Layer solenoid
Hello Everyone, I have no experience in using COMSOl. My professor wants me to run an example project in this software and I have a few specific questions. The problem statement is: I have a multi...
View ArticleResults of fixed Boundaries
Hi all, I've got a Problem. I try to create a phononic crystal lens using pressure acoustics (frequency domain). Even at clamped edeges I recieve acceleration values unequal to zero. How can I explain...
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1D axisymmetric equation based modelling basics
I am pretty new to comsol. I need to model a 1d axisymmetric problem of fluid flow at the moment and develop the model further. I cant find the fluid flow physics for 1D. so i decided to try equation...
View ArticleZero flux boundary conditions issue with Poisson equation
Good morning, I am using version 4.3b. One of the steps in my project requires me to solve a Poisson equation with zero flux conditions at the boundaries. My geometry is a simple 2-by-2 square (domain:...
View Articleevaluating of percentiles
Hi, I'm looking for a java code (not matlab) or a possibility to evaluate percentiles of a 1D, 2D or 3D distribution. I calculate the time step of each element using the CFL number during simulation....
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Singuarity error and mesh size
Hi I have a pde based model where It is a 1d problem which simplifies it to an extent. when I try to run it at coarser mesh sizes I get an error saying may have reached a singularity. When the mesh I...
View ArticleConvergence problems for magnetic circuit
I am quite new in using Comsol and currently facing convergence problems in the following situation: I want to solve the magnetic field in a magnetic circuit where I put a coil of a rectangular cross...
View ArticleHow to plot quantum efficiency
Hi all, I'm a new COMSOL 4.4 user. For my master study I'm trying to learn RF module applications in COMSOL. My topic is quantum well infrared detectors with prism and pyramid geometry. I have...
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