Convert a PDE to the Weak Form
Hi,I have a 2D geometry and time-dependent study with 1D heat transfer in solids, 2D chemical reaction and 2D gas diffusion physics, where I'm using the coefficient form PDEs to model the chemical...
View ArticleVersion Control System & Application Builder
Is there a way to integrate the COMSOL application builder with a version control system to make larger code projects easier maintainable (e.g. GIT or others)?If there is no such integeration, what is...
View ArticlePiecewise Function is giving Unknown variable error.
I am using comsol 5.4. When I define a piecewise function and use it to write expression it is giving an "unknown variable error". (see images). What is going wrong here??(units are all correct)
View ArticleThere is a practical question about the solid-liquid interface and I don't...
Inject a fixed amount of water into an irregular identified container, and want to determine the distribution of water in the container and the position of the liquid surface under the effect of...
View ArticleIs Catia has good scope in future,how it work?
I am fresher after B.Tech I don't know which course should I take and good future scope. But yes, I love to create a new design so I decided to join Catia course from CETPA INFOTECH. If you have any...
View ArticleObject disappearing due to high aspect ratio
Hello everybody, I have been using joule heat module to simulate the quench propagation in 60 cm long superconducting thin film. The thin film with the structure of Au/YBCO/sapphire is made of a 100 nm...
View ArticleTemperature profile around a plasmonic substrate
I am trying to simulate the temperature profile around a plasmonic gold plate in 2D surrounded by water. I am using 2 modules ewfd and ht in solids and fluids. The input field is getting totally...
View ArticleWall Problem in 2Phase Euler-Euler Simulation
Hello,I have a problem with a turbulent 2Phase-flow (bubbles in liquid) Euler-Euler simulation for a vessel which contains rectangular internals. I specified the interface between fluid and internals...
View Articlecontrol Terminal Boundary Condition
hello ,If you have already worked with the terminal boundary condition in COMSOL Multiphysics, you know that this electrical boundary condition may apply fixed state.But did you know that if we can...
View ArticleProblem when putting MATLAB function in COMSOL
Hello,I have a problem when putting a MATLAB function in COMSOL My MATLAB function takes x and y as arguments, and my geometry is 2D. My function was interpolated in MATLAB, and if I try to interpolate...
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which equation should i use ?
heyi am currently trying to model an equation using comsol - it is a transport equation, i need some help with how best to put it into the standard forms.it is a water transport equation that accounts...
View ArticleAC/DC coil current results
I am currently simulating current generation in a coil due to a roating magnetic field. Can someone explain how does COMSOL solve for the coil current vs time plot in results? I assume this just the...
View ArticleFluid structure interaction
Hello I am trying to run a simulation for fluid structure interaction. In the definition section under the global Variable probe I am using an expression for the total forces acting on my model. The...
View ArticlePorous Media Flow problem
Hi there! I want to flow in porous media. Can I use together laminar flow and darcy's law for porous media flowing? Please, help me! Thanks
View ArticleLiquid Surface Model
HI, I'm trying to construct a model to predict the effects of a laser on the surface of a body of water. I've found two papers who do the same in Comsol, with very similar methods using laminar...
View ArticleHow to input continuity conditions (inner boundary conditions) of PDEs in...
I am working to solve two PDEs in the pictures attached below. The governing equation for the concentration is shown in Eq.(1), where the subscript, i (i.e., i=1,2), denotes the variable in the ith...
View ArticleVandium Redox Flow Battery Modeling without Porous Electrode
I've been trying to build a VRFB model based on built in model in Comsol library. I replaced the porous carbon electrode with a normal electrode and removed membrane section. While I replaced the...
View ArticleChanging the inlet velocity for turbulence flow model
I tried to change the inlet velocity for my pipe model and compute. However, the velocity magnitude derived from the result is not equal to the one I entered in the inlet velocity. For example, I...
View ArticleCompute deformed area in frequency domain study
My situation in detail is that there is a cylinder on the slightly vibrating table. The cylinder deforms due to two forces, which is gravity and force from table. I want to get the information of...
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Charge Accumulation under Voltage (AC/DC)
I have been trying to figure out if there will be accumulated charge around nanoparticles on a thin-film, if the film is under AC or DC potential. There are hypothesis suggesting that charge carrier...
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