Problems for calling variables when defining another variable
Hello,I am having problems with defining variable. I am building a heat transfer model and I need to define the specific heat for the material because certain material does not exist in the material...
View Articled operator and dtang operator
Hi, is there any one knowing the difference between the operator d(f,x) and the operator dtang(f,x). When I use the d(f,x) operator in COMSOL 5.3a, there is an error. But when I use dtang(f,x) instead,...
View ArticleSimulation of Reversible sold oxide cell
I am trying to simulate my cell as an electrolyzer(SOEC),but cannot input the parameters of soec in order to run. My cell can simulate as a fuel cell. How can I model my cell to run as an electrolyzer?
View ArticleSimulation is not running
I am trying to solve a model and getting the error pasted below---Division by zero. - Function: / Failed to evaluate variable. - Variable: comp1.rho1 - Defined as:...
View Articlewhy in result time is interpolation and ziro
hi i simulated a 3D and my physics is heat transfer in solid, fluid and porous media and laminar flow and brinkman equation and my study is time dependent(0,0.1.1) i want result in this step 0 and 0.1...
View ArticleAmorphous Silicon under electron impact: in-bulk electron-hole pair...
Hello all!Here is what I want to simulate, first in 2D. A 500 keV electron (let's say coming from the right) hits an amorphous silicon surface, creating many electron-hole pair inside the amorphous...
View ArticleJoule Heating
Hi Guys Salaam I am doing simulation of IC pins On Comsol. My Objective is to evaluate the joule heating effect on the IC Pins due to the injection of electirc current pulse.While simulation, I have...
View ArticlePlot model geometry created using COMSOL with MATLAB in every iteration
I am trying to simulate a model using MATLAB COMSOL interface. MATLAB 2016a and COMSOL 5.0.. I am varying few boundary of the model and tring to plot the geometry in each loop. I tried to use mphgeom()...
View ArticleWhere to define laser power in heating a gold nanoparticle ?
Hi,I am currently developing a model calcualting the temperature increase in gold nanocage in PVDF fiber. I used electromagnetic wave frequency domain and heat transfer in solid model. Can anyone tell...
View ArticleHeat Transfer in a Multilayered Pipe Containing Very Thin Layer of Coating
Dear COMSOL experts,I am using COMSOL 4.3a and I wish to find the Overall Heat Transfer Coefficient (OHTC) of a multilayered pipe. My pipe has two layers, the inner layer is steel with a thickness of...
View Articlehow to plot the current inCOMSOL
hello every one please can you help me in COMSOL i want to simulate the I-V curves in an wire cylindre ESP to compare it with the experimantal results but. my problem is that i don't know how plot the...
View ArticleSeismic Noise (amplitudes) created by water movement
Hello,I am trying to model the seismic noise in a concrete beam created by the water movement in a saturated soil area within the concrete. I was able to model the water movement and saturation process...
View Articlecoupling two phase flow level set method and transport of diluted species
Hi everyone, I am new to comsol. I am modeling a microfluidic T junction where water droplets are generated in the moving oil phase. I have added two channels for water inlet one of which have...
View ArticleExport boundary topography and relative simulated stresses
Dear all,Recently, I have been struggling with something that I guess should be pretty straightforward.I have a simple cubic component with one randomly rough face - so one boundary is a rough surface....
View Articledifference between 2d axisymmetric and 3d model
Hi,I have a fluid flow model of a perfect cylinder. In 3d simulation I get maximum velocity 0.72m/s whereas in 2d axisymmetric model (rectangle), the maximum velocity is 0.64m/s. I thought both of the...
View ArticleSolving nonlinear PDE with customary boundary conditions
Hello Everybody.I want to solve this PDE with boundary conditions: Ut=a.Uxx+b.(Ux)^2 where a and b are constants. U(x,0)=f(x) U(L,t)=0 Ux(0,t)=c.Ut(0,t)+d where c and d are constants. Any help would be...
View ArticlePiezoelectric effect simulation
Hi,I'm trying to simulate the voltage generated by applying a periodic implusive force of say 2N on a piezoelectric sample, but I'm unable to define this force in COMSOL as there is a syntax error. Can...
View ArticleVery Thin Piezoelectric Layer Modelling
Hello,I try to model a structure with a piezoelectric layer of just a view nm. Obviously it is only possible to add the "piezoelectric material" node to the structural mechanics interface. I tried it...
View Articletwo phase flow，not converge
hello，everyone. I got a problem. When I used the phase field method to simulate oil-water displacing process. The geometry is from the pore scale flow model from comsol application library,see the...
View Articlesymmetric acoustic shell structure
Hello ALL,I am trying to build an axisymmetric model with acoustic-shell interaction multi-physics. Acoustic- shell interaction is under 3D geometry. So I have to creat a 3D geometry which is using...
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