Parameters calculation
Hello, I would like to ask if anyone know where I could find a full list or a list of the parameter comsol calculates when solving a model. For example I know for piezoelectrics Y11 corresponds to the...
View ArticleInitial Conditions for Sine-Wave or More complex disturbances
Hi Everyone, I have reviewed previous posts in Comsol forum about I.C . One of the suggested ways of applying the I.C was to do a stationary analysts before the time-dependent one. (This can be true...
View Articletime dependent boundary conditions
hello all.. i am solving a time dependent heat transfer problem.. at the start ,for a rectangular domain boundaries 1 and 2 are insulated and 3 and 4 are assigned with constant temperature.. after some...
View ArticleHow to integrate a table result
Hello, I have calculated surface integrals for total flux over particular features in my geometry. This outputs a table of total flux in (mol/s) vs. time points. I would like to then be able to...
View Article2D geometry but illuminated from below
Hi, I want to create a 2D geometry but illuminate it from below, or out of plane, with a plane wave. Whenever I try and set the Background Field as exp(-i*emw.k0*z) (in x direction) I get errors as it...
View Article2 sets of PDE equations with same variable
Dear all, I have a Comsol model in which I have two almost identical sets of general PDE equations. This is because i first solve them with a stationary solver to find stable initial conditions and...
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 ArticlePlot a formula
Hi, I am trying to do simulation of resistivity changing versus deflection of a membrane. the membrane is subject to an input pressure from range 0 to 100[kPa]. I simulate the model parametric and...
View ArticleIn joule heating ,how to compute the resistance of a body?
In joule heating ,how to compute the resistance of a body? can you tell me the formula? such as voltage is V, the symble of current is what and the symble of resistance is what in comsol? Thanks a lot!
View ArticleRadial diffusion
HI, I am trying to build a 1D model which is a line, but I want the diffusion to be radial instead of linear, I know that the equation is : dC/dt = D[ d2C/dr2 + (2/r) * (dC/dr )], but I do not know how...
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 ArticleVolume at constant temperature
Dear all, I am using the heat transfer module to simulate heat flow through a rod. The rod is connected to a piece of copper that is held at a constant temperature. The problem is that Comsol only...
View Articlethe frequency domain or the transient modulator??
i want to choose the wavelength between the 300 nanometer and 1500nm. it's well known to us that the range of the wavelength correspond to a pulse with a fixed width. how can i successfully set the...
View ArticleMeshing and convergence problems
Dear Comsolians, I was finally able to draw the problem in 3D in Comsol :), am also a beginner, lol. The way I have modeled the coils is that they do not form a complete closed loop, thus I assigned...
View ArticleUncertainty in deflection of mechanical structures
I designed a silicon structure which is supposed to deflect in the transverse direction (Y axis) under axial buckling (compressive) force (applied along X axis). Even after increasing the number of...
View ArticleConstrains and laminates
Hello, id like to simulate a laminate with around 5 isotropic laminated layers. These layers are in the form of a plate with a constant area load. The model is a laminate for photovoltaics with area...
View Articleinternal wave modeling
Hello, I am trying to model a basin with two different densities to create an internal wave. I use NV and Convection-diffusion equations. Any idea how I can proceed? I have a domain and good mesh. The...
View ArticleLiveLink for MATLAB Y Axis Label Mirroring Problem in Mac OS X
When plotting a figure with the LiveLink for MATLAB, the Y label appears as a mirror image. I am running COMSOL 4.3a (4.3.1.161) with 64-bit Matlab R2012b (8.0.0.783) in Mac OS X Version 10.8.3. The...
View ArticleFrequency domain study for Joule heating physics
I am trying to do a frequency domain study for the physics "Joule heating and thermal expansion". However, I realized that comsol does not support this study for the physics. When I select frequency...
View ArticleVariable modifications between solution iterations
I'm developing a transient model using the Livelink interface. The model first calculates an initial solution for the first time window, then I would like to modify the state variable values due to...
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