coupling 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...
View ArticleSolvent Extraction
Hello,I am trying to create a solvent extraction model. I have 2 inlet (one is a solvent inlet and the other one is organic inlet) and I have 2 outlet (one is a organic outlet and the other one is...
View ArticleTrouble with a Laminar Outflow Flow Rate and a pressure at the Inlet
Hi,I'm relatively new to COMSOL. Im trying to set a system with boundary conditions where I define my outflow flow rate and ave an ambient pressure at the inlet (Case 1).I have tried it th other way...
View ArticleCrashing, can not interpret error log file
Hello, I have a simulation that I succeeded to run a few times, but most of the times (parameter changes) the application crashes. I have a hard time interpreting the log file, which I have attached....
View ArticleTracking displacement on a thermal actuator after remove voltage source
Hello,I am new in comsol. Now, I am trying to simulate displacement of a thermal actuator under 5V. I am using the time-dependent modal. I can get results of stress, displacement, and temperature....
View ArticleParameter sweep over geometrically decreasing mesh and material property
The below post is related to an archived discussionThere were earlier discussions on a parametric sweep of geometry. I did this using a range function in COMSOL which allows a discrete change in a...
View ArticleThe meaning of each stress and strain option in the post-processing of...
Thank you for providing the requested information. When I was using COMSOL's solid mechanics module, there was a problem that always bothered me. I found that there are many options for stress and...
View ArticleCharged particle tracing in combination with a changing electric field
Hi, I would like to combine a charged particle tracing with an evolving electric field between two plates. The issue I have, is that I have no idea how to implement an electric field as a function of...
View ArticleIncident angle vs. transmittance angle using Ray Tracing
Hello,I am new to Comsol and I am still getting familiar with its functionalities. My current simulation aim is to use the Ray Tracing tool with a rotating convex lens and plot the incident angle on...
View ArticlePDE implement Floquet boch Boundary condition
Hi,I am working in PDE module.I need to solve Laplace Equation with single variable.My domain is a rectangular domain.I know that my solution varies sinusodially along x.I want to know how I can impose...
View ArticlePhase Change Material
The below post is related to an archived discussion[start here] "Phase change material" is discussed in Heat Transfer Module User's Guide. See "The Heat Transfer Features"> Domain Features >...
View ArticleUnexpected size of render data
The error message "Warning: Problem encountered during results while solving. Unexpected size of render data." can be caused by the following:You have enabled a plot of residuals in "Results While...
View ArticleA probelm in Solving nonlinearity in Magnetic Fields(mf)
Dear CommunityI am trying to build a 3D model where a coil wound around a soft magentic iron core with a copper cylinder inside the core. I am trying to inject a current in the cylinder and sense the...
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