Tracking Residual
I need to track the residual in my simulation in order to represent how closely the governing equations are being represented. I know comsol keeps track of residual since ive had several errors...
View ArticleStreamline along a line or plane
I have a 3D model of a system of permanent magnets and am trying to obtain a streamline of magnetic flux density along specific planes in my model. In the settings for a streamline plot there is an...
View Articlewhat's different between 'frequency domain' and 'frequency domain,...
Hello guys I'm simulating a cantilever sensor, which contains three modules, 'laminar flow', 'electric currents', and 'particle tracing in fluid flow'. For this, in electric currents module, AC...
View ArticleSimulating a rheometer
Hi Everyone, I'm a bit new to Comsol so sorry if this is a dumb question. I'm trying to simulate a rheometer in my lab. It's basically a cone in a petri dish. For simplicity I'm using 2-D and have...
View ArticleLaminar outflow boundary condition does not converge!
Hello everyone, I am new to this programm and want to simulate the first part of a streamed circular duct. It serves as an hydrodynamical entry length to develop the velocity flow profile. In the...
View Articleinduction heating
Hello every body, I want to know if it is possible to measure the impedance of a charge in induction heating process. I can have lot of informations on the coil parameters (Icoil, Pcoil, Zcoil...) but...
View ArticleHow to solve non linear problem and how to converge it .
I am using COMSOL 3.5a. I am solving heat transfer through conduction and then convection. During the first stage of conduction the model is not converge it shows the singular matrix error. My question...
View ArticleCan I access each cell's residual
Hi, I was wondering if it is possible to access the flow residuals from a UDF? I need to be able to access the momentum and continuity residual for every cell in the computational mesh. Thanks, Farid
View Article1 week away: FINAL Abstract Submission Deadline for COMSOL Conference 2013...
Dear COMSOL Community, Here comes the final week for abstract submission to this year’s COMSOL Conference in Boston! New and updated abstracts are coming in every day and I truly appreciate your hard...
View Articlesolid liquid interface, heat transfer
Hi everyone... My geometry model is rectangle in which solid material is heated from left end. The rectangle model have two horizontal sides which are insulated and right side have a initial...
View ArticleForced convection - horizontal flow against a plane sheet with a blunt edge
Hi folks, that's my first time I'm working with COMSOL MULTIPHYSICS and I'm trying to simulate a horizontal flow against a plane sheet with a blunt edge. I use convective and conductive (cc) and...
View ArticleQuantifying the force due to electrostatic pressure via the maxwell stress...
I hope this is a easy question to answer because I know there must be a way to obtain the numerical output for the forces created by electrostatic fields. I have produced an ES model with similar...
View ArticleFluid Flow between small pipe and large tank
This may be a simple question: I have a small vertical pipe with an inlet at the bottom (inlet velocity =~10m/s). The pipe is connected to a larger tank at the top. The outlet is set to be at the top...
View Article2 Parameter Sweep Causing Problems
I'm trying to do a parametric sweep over 2 parameters and plotting the result. I'm trying trying to calculate the eigenfrequencies of a simple structure as a function of 2 parameters. I can accomplish...
View Article3D Boundary mode analysis for plasmonic waveguide
Greetings. I have a plasmonic waveguide - a silver brick on silicon substrate with glass cladding. I would like to know the modes which this waveguide supports. First I have made a 2D mode analysis and...
View Articlehow to simulate the breakdown voltage in COMSOL?
hi, how could I use COMSOL to calculate the breakdown voltage in the dielectric?
View ArticleFluid flow into atmosphere
Everyone, I am still relatively new to this program. I have attached an example model to help explain what I am trying to do: I have the annulus of a vertical pipe with air flowing from the inlet at...
View ArticleMeshing 2-D and 3-D geometries with matching meshes
Hi! I have a very expensive 3-D electro-chemistry problem which I am trying to simplify. The problem has fluid flow and electro-chemistry (tertiary current distribution) equations in it. I would like...
View Article3D or 2D simulation of a drop on a silicone surface
Hello Everyone, I am new to comsol and I need to simulate a a water drop on a silicone surface. This water drop was placed on the silicone surface and i am required to find the force that will make the...
View ArticleSimulate Fields Outside of Semiconductor Device
Is it possible to simulate the electric fields outside a solid-state device (such as a PN junction)? In other words, I'd like to create a boundary outside the device representing air and solve...
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