Modeling Membrane Permeability in a Coefficient Form PDE Model
Hello, I am trying to model diffusion of water through a cell modeled by a circle placed in the surrounding environment modeled by a square. I first tried out the model using natural boundary...
View ArticleError function in geometry
Hello folks, I wanna to draw "erfc" function as an upper border for my geometry. Any idea ? Thank you in advance!
View Articleelectro-convection
Can Comsol solve an electroconvection problem? To clarify: a polar gas or liquid moves in nonuniform electric field. Thus, we need to solve for electrostatics, and the known field distribution will...
View ArticleTime difference
I am interesting in natural convection simulation. I have a problem of validation my COMSOL model where the time in the literature case differs from my model time . In another words, when I try to...
View Articlevertical moving magnet in the air
hello dears, I want to simulate a moving magnet in the air and see how the magnetic field changes in the air.i used rotating machinary in 2d in the model navigator.i want to use assembly for my model...
View ArticleNear field/Far Field of scatered light from a nanoparticle
Hi,I am simulating in Comsol 4.2. In my simulation domain ,2 micrometer by 2 micrometer,the upper portion is air and the lower surface is glass.A nanoparticle of 300 nm is placed at the...
View Articlecannot use old values as the initial values for new step
Dear sir or madam, I am using comsol to simulate a stationary model. I had convergence problems so that I was forced to vary the inlet BCs gradually to converge to the real case and I had to use the...
View Articlecannot use old values as the initial values for new step
Dear sir or madam, I am using comsol to simulate a stationary model. I had convergence problems so that I was forced to vary the inlet BCs gradually to converge to the real case and I had to use the...
View Articlecannot use old values as the initial values for new step
Dear sir or madam, I am using comsol to simulate a stationary model. I had convergence problems so that I was forced to vary the inlet BCs gradually to converge to the real case and I had to use the...
View Articlecone-jet mode in electrostatic field
Hi, Here is my problem. I want to simulate a electrohydrodynamic (EHD) phenomenone , a nozzle with full water (or electrolyte) in a electrostatic field, the the water is polarized and deformed the...
View ArticleMagnetic Force on an armature
Hello I'm dealing with a very simple problem that has been very frustrating for me! I would appreciate if any one can assist me with that. I'm modeling an E-shaped core in 2D magnetic field module. It...
View ArticleTime integration in comsol 3.5a
Hi everyone, I am just wondering if there is a time integration function in comsol 3.5a. I am calculating fluid flow rate through a boundary and which is a function of time and I would like to...
View ArticlePhysics for a elastomeric vibration isolator.
Good morning. I'm almost finished with my model. The model consists in : 1 - Base. ( Base ) 2 - Elastomeric Rubber. ( Borracha) 3 - Lid. (Tampa) 4 - Screw Hole.( Parafuso ) The Screw Hole receive the...
View Articlethermal BC's across the interanl surface between the heat sink and air in the...
n Model Library : Heat transfer module : Tutorial models: heat sink . It is considered the temperature filed is continuous across the internal surface between the heat sink and the air channel. first...
View Articlesimulating a rotating and moving blade
hi, i want to simulate a blade that is both moving up, down, front and back and also pitching at the same time mostly with time varying velocities. i know i have to use mesh deformation but i dont know...
View ArticleModelling of a permanent magnet
Hello everyone, I want to see the magnetic field lines from a bar shaped permanent magnet. I have created a rectangle and surrounded it with the air domain i.e a bigger rectangle. I have the following...
View ArticleError - Failed to evaluate variable jacobian
Hello, I am currently working with the batteries and fuel cells module and I am attempting to create a model of a micro-scale PEM fuel cell. Right now I am starting by just trying to solve a free and...
View ArticleMoving Mesh and Variable Knudsen Diffusion Coefficient during CVD
Dear Forum Members, I am trying to simulate oxide deposition inside a 100 nm pore by using a 2D axisymmetric model. The model is similar to a heterogeneous catalysis problem and the only modification...
View Article2D patterns on 3D geometries
Hi, Is there any way to draw a 2D pattern on a surface of a 3D geometry in COMSOL 3.5(a). Suppose we have a block and on the top surface of this block we want to draw a 2D rectangle. Any suggestions?...
View Articlefailed to generate mesh for face
hello, i imported a solid geometry to comsol, but when i generate mesh i get error: failed to generate mesh for face, i tried to make custom mesh for these faces, but did not solve the problem. can...
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