Two-phase flow physics
Hi there, I have experience dealing with CFD problems with the finite volume method. I use my own code, starccm+ and openFOAM very often. I am trying to make some animations with a multiphase flow for...
View Articlemodeling of Diffusion
Hi, I want to model a simple mass diffusion process, but with a concentration dependent diffusion coefficient. In variable I defined a function for diffusion coefficient. but when I want to solve the...
View ArticleMeshing problem for coaxial cable with helical inner conductor
Hi Good day. I am using a coaxial geometry which has helical inner conductor and cylindrical outer conductor. I am also using emw physics.while simulating/mesh generating I am getting error which...
View Articlevertical exaggeration
Hi all, I'm trying to change the views of my 2D plot in order to have a vertical exaggeration (1:4). I've tried to play with the lock aspect ratio but it seems the model is squeezed into a cube-like...
View ArticlePrescribe number of Meshing Elements
Good day, for a model of simple geometry (sphere) and fixed volume, is there a way to define a specific number of meshing elements? I am trying to solve my system with a specific number of elements and...
View Articleelectrohydrodynamic problem
Hi all, I'm currently simulating the electromechanical effects of water droplets under both AC and DC voltages. The water droplet is placed between an energized and grounded electrode on an insulating...
View ArticleGeneration of thicker boundary layer mesh
Hello guys I wanna make some think boundary layer meshes. In my simulation, the boundary layer thickness delta is so big in that Re_x = 9.8 and delta = 5.0x/sqrt(Re_x). So I think the boundary layer...
View ArticleCreep - Plasticity
I want to use the non-linear structural mechanics module for simulation of plastic deformation by yielding. There is a creep module and a plasticity module. In the creep module, I find more suitable...
View Articlewhat does the "exclude algebraic" error estimation option do?
I'm working on a time dependent convection-diffusion simulation. The Peclet number is 10^3 to 10^4. The maximum Reynolds number is ~100. The solution tends to diverge at a point where the input...
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 ArticleLarge Eddy Simulation
hello I want to use Large Eddy Simulation on comsol but I can't found it. Can you help how to do this. thanks a lot
View ArticleBase vector coordinate system
I am modeling the anisotropic behavior of a plate that have fibers oriented in different directions. For this purpose, I am using the structural mechanics feature. I am orienting my fibers using a...
View Articlehow to do moving mesh in 4.2a
Hello everyone I am implementing a rectangular piezoelectric converter, in which i want to be vary the length and width of the piezo layer via moving mesh ale. I studied one of the paper of "Thickness...
View Articleexport mesh data for an explicit selection
Dear all, I am a relatively new user COMSOL with a lot of Finite Element experience both on the programming and theory level. I started with COMSOL today which went actually quite fine and fast. I...
View Articleoptical fiber modeling
Hi everybody, 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 am performing a simulation of light coupling...
View ArticleHeat Flux Boundary Condition
Hi, I am trying to impose a constant heat flux BC to the common face of two metal blocks. But comsol does not allow me to select that face for this type of BC. In fact, only outer boundaries are...
View ArticleCapacitance matrix evaluation (electrostatics)
Hello everyone, i have a question about the capacitance calculation method. In comosl example "Capacitance matrix", it explains that the electrostatics model use the Charge volateg relationship (Q = C*...
View Articleinterface to be used in studying electrochemical reactions
what interface should i use in Comsol 4.3b if i want to study species transport inside the electrolyte,ion transport including convection,diffusion and migration and electrodic reactions represented by...
View ArticleMapped Coordinate System for L-Shape
Hello, I would like to simulate the deformation of an L-Shape made of carbon fibers. In the beginning the L has an angle of 90 degrees but after it is cured in the oven, there is a spring-in effect,...
View Articlemoving inner boundary by defining prescribed displacement
Hello everyone This may have an obvious answer but I am a bit new with Comsol so I am playing around with various interfaces, particulary the ale interface. I am trying to deform an inner boundary by...
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