Load or Temperature Assignment to Nodes
Hi All, I utilize Livelink Matlab to solve a multiphysics problem. First of all, my Comsol model solves film pressure on a surface. Then, I extract the pressure distribution and film thickness of a...
View ArticleHow setup a current density in RF module
I am calculating the Lorentz force in a sheet metal near spiral coils. Transient current thru the coils have short period. So I am using the RF module instead of the AC/DC module. In one example, I...
View ArticleAssigning Colors to differerent particles released at different time
I am talking about post processing->3d->more plots>particle tracing. I have a simple diffusion model where I want to trace the trajectory of particles released from a area at different times....
View ArticleAssigning Colors to differerent particles released at different time
I am talking about post processing->3d->more plots>particle tracing. I have a simple diffusion model where I want to trace the trajectory of particles released from a area at different times....
View ArticleVoltage output for PVDF
Hi I am faily new to comsol and was told that it was good to model piezoelectric responses. I am trying to model something transient voltage output but using flexible film. I cannot figure out how to...
View ArticleDynamic stiffness of rubber bushing with static pre-load
Hello, I am interested to model a rubber bushing and to calculate its dynamic stiffness (frequency analysis). The bushing is pre-loaded, which means it could have large deformations. Any good advice on...
View ArticleHeat Transfer in air
Hi all I used comsol 42 from two years ago to calculate some quantities in Fluid Flow. Now I would like obtain the curve T = T(t) of a material in air, where T is the temperature (K) of the material...
View ArticleFrequency domain - mechanical
Hi, I am an electronics student and am trying to simulate the mechanics of a square plate. My plate has the 4 side faces fixed and a uniform distributed load on one of the larger faces. The stress and...
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 ArticlePlotting local surface integration along a line
Hello, I have a fluid flow model in a channel that has a rather complex geometry and cannot be sliced up. I'm trying to extricate local flow rates numbers (for the sake of averaging) from along this...
View ArticleSmaller element size caused problem in Acoustic-Shell Interaction
I found an interesting result from COMSOL 4.4 Acoustic-Shell Interaction. Let me describe it here: I have a 1 square meter cubic whose all 6 walls were set to Sound Hard Boundary except a A2 size...
View ArticleModel Hall effect in semiconductors
Hi, all I'm modeling the hall effect in semiconductor module and there's something about the coupuling of semiconductor module and electric circuit module. I defined a p-n junction with doping profile...
View ArticleModel Hall effect in semiconductors
Hi, all I'm modeling the hall effect in semiconductor module and there's something about the coupuling of semiconductor module and electric circuit module. I defined a p-n junction with doping profile...
View Articlecomsol generates a reduced mesh when starting second step in conjugate heat...
after building the corresponding model and its mesh which has pretty high resolution 1.5m elements i click on solve, however the solver fails stating that boundaries could not be respected, examining...
View ArticleMaterial Properties setting problems in AC/DC Module
Hello, I've created a simple 3D model in the AC/DC Module. When I'm viewing the geometry using the select domain option I can view and select all of my 10 domains. But when I go to assign materials to...
View ArticleEigenvalue Plot for a Two-Parameter 3D Geometry
Hello, I am modelling a PDE inside a specific 3D geometry, and using the built-in Eigenvalue studies for different parameters that alter the size/shape of the geometry (i.e width, height). I have...
View ArticlePotential Variation Across a piezoelectric nanowire
Hi, I am trying to model the potential variation across a piezoelectric nanowire. I want to see how the piezoelectric potential varies if the contact between the metal and the nanowire is a scottky...
View ArticleParticle Release Time vs Data Set time. Please explain the difference.?
So I have a solid cylinder in which concentration varies according to time. I want to trace the path of a particle from point A to point B inside the cylinder block according to concentration gradient....
View ArticleDC resistivity modeling
Hi, I want to use COMSOL to model resistivity (geophysics). (Electrical Resistivity Tomography, ERT) I have a number of cells (side by side, creating a square of cells in both x and y direction), which...
View ArticleHow to define a mixture of two miscible liquids at the inlet?
Hello, I have a question about how to define a mixture of two miscible liquids (for instance water and ethanol) at the inlet. My 2D geometry is as follows: I have two parallel rectangles (representing...
View Article