When we using meshing?
Hi please help me I started define a waveguide with this software,and i have a question: when we using meshing? friends please help me thanks
View ArticleHeat transfer
hi, i need to calculate thermal conductivity for various volume fraction of ALN with PMMA. In that paper they mentioned about When the sample is given a heat power,the direction of heat transfer is...
View ArticleHow to get current from current source
Hi. I've build a model consisting of 4 electrodes, soil and air. The two outer electrodes are assigned with current source. One with a positive magnitude and the other with a negative sign at the same...
View ArticleConvergence problems with non-newtonian power law fluid
Hi, I'm modeling fluid flow through a microfluidic bifurcating network. Among other things, I am calculating the volumetric flow rate for a given applied pressure and comparing it to experiment. The...
View ArticleReading Deformation graph
I am getting a coloured graph for deformation in microgripper. Now I want to get the values of deformation at different point(x,y,z) (instead of graph) please let me know how to get that in comsol.
View ArticleUsing PDE to model 3D Maxwell equations for wavelength generation
Hi everyone I want to use PDE to model 3D Maxwell equations for wavelength generation by simulating the ultrafast laser beam interacting with gasous material in a gas cell. The equations in cylindrical...
View ArticleIntegration coupling variables
I am solving the Navier-Stokes equation in 3D (time-dependent). Afterwards I like to compute the total kinetic energy by integrating the velocity squared over the volume. I like to have this energy...
View ArticleProblems generating lamb waves in an Aluminum plate
Hi, I am trying to generate lamb waves in an Aluminum Plate using a Piezoelectric actuator placed in the center of the plate. I am pretty sure that the physics involved are solid mechanics and...
View ArticleThin Film BAW Composite Resonator simulation in COMOSL 3.5a
I'm currently engaged in the simulation of FBAR device in COMSOL 3.5a, and want to use this model. However, "in the model library", I find that the admittance of electrode is defined as...
View ArticleNegative port impedance
Hi All, I am currently doing some antenna modeling. The antenna is excited by a 50 Ohm coaxial port. I get reasonable S11 results at resonance but the lumped port impedance is negative e.g. -5 Ohms....
View ArticleInitial condition for time dependent study
Hi, I'm trying to model free vibration of a small PZT cantilever (MEMS). I need to apply some initial conditions on displacement in a time dependent study. How can i do it? Thanks Andrea
View ArticleUsing external file data for heat source
Hi all, I am trying to solve a model for heat transfer in solids using external data as heat source input. The geometric model is simple and composed of 3 separated bodies attached together by a...
View ArticleFailed to evaluate variable: freq
Hi COMSOL Users, I'm new to using the v4.x series of COMSOL, so perhaps I've missed something simple, but I get an error when trying to plot body volume force variables. The error message...
View ArticleTest function for Electric field
Hey all I am working in the 2D piezoelectric module and I want to take weak forms of Electric field in different direction, test(pzd.EX) and test(pzd.EY) but its showing error. When I try by making the...
View Articlehow to create polar plot in journal bearing
hello, need some help from u all to plot these polar plot. these study about pressure distribution around bearing surface of hydrodynamic journal bearing.. radius bearing : 50mm height bearing : 50mm...
View Articleflow boundary conditions: periodic velocity fall and normal velocity zero
Hello, I am attempting to simulate a 2D flow of a suspension of solid disks on a square lattice. To reduce the computational expense of this simulation, I'd like to consider shear on a single disk at...
View Articletime dependent coupled thermal structural with slow & fast pressure & thermal...
I ran a time dependent coupled thermal-structural problem with temperature dependent structural and thermal properties. When the thermal and pressure pulses were ramped up over two seconds no problem....
View ArticleQuestion about using multiple processors in Gui mode for "form union" operation
Hi, I am currently working in the RF module on a cluster. Right now, I'm working with a very large geometry (large in that it contains many domains). It is so large that it takes a very long time for...
View ArticleCalculating advective/diffusive fluid flux over a boundary -darcy's law and...
Hello, Currently, I am modeling the transport of diluted species under concentration gradient and pressure differential in the soil which enters the building through foundation cracks. I am using two...
View ArticlePersonalized heat source
Good morning everybody, I am a novice in use of COMSOL, I want to simulate the propagation of heat through a material, sounds easy but my heat source is a surface defined by a matrix (every pixel is a...
View Article
