Not specifying boundary conditions for certain dependant variables.
Hi, I'm currently working on a system of PDEs using the Coefficient Form PDE module in 2D for my reactor design coursework. My system requires the coupling of multiple dependant variables with...
View Articlepermanent magnet (Nd magnet)
I designed the nd magnet.In magnetic flux conservation 1 , the z axis was set to 0.5030T.( Nd magnet)In magnetic flux conservation 2, air domain was set to relative permeability. (Air zone)Infinite...
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Issues with meshing domain with many lines
I'm trying to solve a problem where the domain is a unit cube with lines generated via a periodic voronoi tesselation. I require these lines for my physics. I am very often running into issues when I...
View ArticleHow to set units for spreadsheet interpolation functions
Hi everyone,I am using interpolation functions as part of my user-defined material of supercritical nitrous oxide.I created a single file containing all the necessary properties from REFPROP 9.1 like...
View ArticleHow to solve a diffusion problem with precipitation reaction
Hi,I want handle a dilute diffusion problem. During diffusion, precipitaion reaction may occure and compounds would form if concentration on the element is high enough.I am not sure how to solve this...
View ArticleHow to get a temperature value a one point and assign it to a boundary variable
i need to create a velocity for the moving mesh, this velocity takes the temperature value at (r=0) in the (2D axisymmetric model) and multiply it by a simple exponential function of r to give a...
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How to stop COMSOL Events at an exact value?
I am simulating battery cycling using the Events interface. The voltage limits are V_high = 2.45 V and V_low = 2 V. The events are working okay, but there is a problem that I have encountered multiple...
View ArticleProblem with zoom and rotate in graphics
I develop the application for my graduation work in Comsol Multiphysics 5.4. I want to place the geometry of my pyramidal absorber and the electric field next to each other and I don't want to open its...
View ArticleIn a Turbulent-flow k-eps (spf) CFD, how would I find the net moment of the...
In a Turbulent-flow k-eps (spf) CFD, how would I find the net moment of the air-forces on my body about a user-specified point? Similarly, how would I find the center of pressure (related).
View ArticleLinear voice coil actuator modelling
Hi,I'm trying to model a simple voice coil actuator in 2D and the magnetic feilds looks accurate. I also run current through a coil and try to calculate the resulting force on the coil. The results...
View ArticleHelical Resonator
Hi, I am looking for possible resonances of a helical resonator in a copper cylinder. Here I attached my file. By using eigenfrequency study in the RF package and setting up reasonable boundary...
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Help with meshing a simple solenoid, to be able to calculate its inductance
Good afternoon,I have a parasolid file of a solenoid, and am trying to calculate its inductance using the mef package. The mph and parasolid CAD files are attached, as well as a screenshot of the...
View ArticleSimulating electromagnetic transduction of energy in 3D model
Hello,I'm trying to simulate in a 3D model, electromagnetic transduction of energy. It consists in a permanent magnet surrounded by a copper coil with a known number of turns. I already managed to...
View ArticleMeasuring resistance via electric current from current density and area???
Hi,My model started with solid mechanics physics study on the von Mises stress impart onto the underlying bond pad layers by the probe moving downward along the Z-axis with prescribed displacement and...
View ArticleSir, I want to calculate optical mode and acoustic mode which is produced by...
I want to calculate optical mode and acoustic mode which is produced by Brillouin scattering. Would you please give me more detailed description or some detailed calculation explanations? I did not...
View ArticleMultiphysics analysis: mechanical stress inside a cylinder-piston system
Hi all, as written in the title, I need to compute a multiphysics analysis. In particular my model is a 3-point-bended beam inside a cylinder in which there is air at a certain starting pressure. On...
View ArticleConvergence test - wave optics interface
considering the scattering problem off of a si nanosphere: a si nanosphere radius 250nm and a pml radius of 2300 nm. Incident radiation with lambda = 1000nm propagating in z direction has an electric...
View ArticleCOMSOL Issue
I am simulating a (optoelectronics) solar cell in COMSOL and I am getting an Current density-Voltage (J-V) charatersitics but i have an issue that the curve is not crossing the voltage. so i can decide...
View ArticleChanging Material Properties
Good day all,I am modeling CO2 injection in a pipe, and I know that CO2 find and input into the model by finding it in material section. However, CO2 that is offered by Comsol is ideal gas condition,...
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