please help me to measure Voltage,!
HI, I am very new to use COMSOL, so I wanna ask some problem to proficient person who could use COMSOL, I'am measuring Voltage from piezo with some stress, when I measured Voltage from piezo by using...
View ArticleCan Dirichlet B.C. affect the eigenvalues?
Hi everyone I'm dealing with an eigenvalue problem that is supposed to study the effect of the Boundary condition on the eigenvalues. Apparently, in an Eigenvalue study in COMSOL, any prescribed values...
View ArticleIdentify the effective mode for Photonic Crystal Fiber based SPR design
Hi, I have designed a Photonic Crystal Fiber for Surface Plasmonic sensor. When, I run the COMSOL than I found several mode confine the light in the core....Now, my question is how can I understand...
View ArticleMixture of sweep mesh+Tetrahedral mesh in a 3D model
I have a helical coil embedded in solid cylinder and was trying to figure out best way to mesh it since helix always creates problems. 1)I did a mapped mesh on one end of coil cross section. 2)Swept it...
View ArticleBoundary conditions on 2D axis-symmteric model in Thermal stressProblem
I am imposing the very high temperature field i.e. T(r,z) on 2D axis-symmetric (cylinder) model in order to calculate stresses/strains. As temperature is high enough to yield the material , so I am...
View ArticleCouple strain with ion concentration?
I've been modelling ion transport in a porous material using the chemical engineering module. I would like to also model an induced strain in the material that is linearly proportional to the local ion...
View ArticleHelp needed for intercalation stress at COMSOL
Hi C.Lim, I am, working on same problem i.e. intercalation stress. I followed your suggestion like putting partial molar volume as expansion coefficient and concentration as temperature. However, my...
View ArticleErrors with conjugate heat transfer...
Hello I am new to COMSOL and I am doing simple test model of natural convection of air around hot metal cylinder. I think, that I set everything properly (like volume force etc), physics is quite easy...
View ArticleUse the result of 2D simulation into 3D simulation
hi everyone! i want to increease the speed of my 3D simulation, so i have a idea: the result of a 2D simulation is used as the initial value of a 3D simulation, then maybe the 3D simulation can find a...
View ArticleParametric sweep through time
Hi Ivar, In this thread:www.comsol.com/community/forums/general/thread/31432/ you mention that for a stationary solver, you can sweep on "t" using "t" to point into a time series solution. I am...
View ArticleAccessing solution of one study into another one ?
Hi, I been modeling hyperelastic material models in comsol which revolves around three different studies on the same geometry, with different boundary conditions. I would like to access results from...
View ArticleFile import/export procedure: Not reading whole data
I am importing a notepad .txt file that contains the temperature values with respect to position i.e. T(x,y,z) in 3D geometry. I am using: 1- Global Definitions --- Interpolation --- import file 2-...
View Articletime dependent study for sinusoidal wave
Dear all, I'm trying to simulate my module in 2D axis of COMSOL version 4.3 in joule heating physics with sinusoidal input voltage of { V0*sin(2*pi*50*t)} and for the frequency of 50 Hz it will takes...
View ArticleFrequency domain using two pi/4 phaseshifted Piezos
Hello, I want to analyse the mechanical behaviour of a spring, that is being piezoelectrically activated. With one piezo this wasnt any problem, as i would just use 5V as electrical potential, and run...
View ArticleAutomatic time step increase in generalized-alpha solver
Particle tracing is conducted by a generalized-alpha solver. For many cases, when the particle motion is finished, the time step is increased drastically. However, in current case, time step is...
View Articlehow to use the "Previous solution" as initial value for new analysis
Any idea how to use the "Previous solution" as initial value for new analysis, for the sake of solution convergence?? Preferably, step-by-step procedure! Thanks, Hina
View ArticleI want to get surface wave.
Hi there. Thank you for reading my discussion. I try to build suface wave. I make a rectangular at first and apply a open boundary condition at the top of rectangular , then I use...
View ArticleElectric field just above an interface
I apply a static electric field across a 2D air gap. Somewhere in the air gal I place a square dielectric. I notice the solved E field is discontinuous at the air-dielectric interface. So it's a...
View Articlemeshing long and thin wire
Dear all, I need to create long and thin wire with different length of (500,700,1000)m, and radius of (0.315mm) and layer of insulator of (0.135 mm) in (2D) axi-symmetrical. But when I add the...
View Articleconvective heat transfer on a sphere
Hey guys, I'm writing a simulation of freeze drying for my bachelor thesis. In my bachelor-thesis, i’m looking at a system with a particle of pure ice (T=230 K), which is exposed to a ingoing water...
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