Boundary conditions in Equation-Based Modeling
I am trying to solve a set of three "Helmholtz-type" equations using the Equation-Based Modeling of Comsol. There are three independent variables, call them u1, u2, and u3. The equations are (with some...
View ArticleALE+ PDE form
hi all. I have a PDE coefficient form for evaporation of fluid in a fluids mixture. The governing equation has the general form of: d(X)/dt=d{D(X,T)*d(X)/dz}/dz in above X is the evaporating fluid...
View Articletumor ablation model
hello, i am trying to make a model like" tumor ablation" model in comsol Heat Transfer Module but i want to change the current from DC to AC current and i want to plot the electric field distribution,...
View ArticleCan I suppress breaks if there is an error?
I have a model that I would like to run in a parameter sweep. However, some of the parameters I give the model fail to yield stable solutions and hence cause a break. I don't necessarily know...
View ArticleLine maximum - data manipulation challenge
I need to take a series of derived maximums (for Temperature, say) from a regular array of parallel lines which are perpendicular to the y-z plane and pass through a bounding box in 3D space. The data...
View ArticleConverting a circulator into an isolator
HI!! I have implemented the '3-port circulator' example provided with the rf module and now I want to convert it into an isolator.After some search on the internet I have found that a circulator can be...
View ArticleFail to evaluate the derivative at a line
Hi, I am using COMSOL 4.0 RF to model light scattering. In 2D model, i calculate a very thin sheet scattering, which is 1D geometry in such 2D model. So i use the surface current boundary condition for...
View Articlemodeling evanescent wave
Hi all, How to generate or simulate evanescent wave in COMSOL? can total internal reflection work? There seems to be rare examples in this field and expect for any ideas from you.
View ArticleModeling a Diode
Hi, I am trying to follow the example of semiconductor diode available in:www.comsol.com/showroom/documentation/model/114/ in a COMSOL 4.2. I believe that I have followed exactly what is describe in...
View ArticleHelp with Tracer Dye Profile in Laminar Pipe Flow
I am new to COMSOL. I am currently in a Finite Element class and we have an educational license for Abaqus, but as the lone environmental engineer in the class it doesn't provide me with much useful...
View ArticleSteam
I'm working with steam and condensate phase shift. I wonder who can help me with the correct handling of steam?
View ArticleHelp. contact pair penetrate each other.
Dear, all, I have a basic question regarding to mechanical contact. I have just run a very simple simulation: a deflected beam contact a fix cubic. However, I always got penetrated displacement of the...
View ArticleCan I use COMSOL to solve integral equations?
Dear all, I have some integral equation to solve. Can I do that with COMSOL or I always need to change it to PDE? Thanks a lot!
View Articlemodeling sessile droplet evaporation
Dear Firends, does any one has experience with modeling phase change from liquid to gas ? is there exists any tutorial ? I intended to model evaporation of single droplet pinned of relatively hot...
View ArticleAnimation Scale Factor
I'm trying to create an animation of my simulation. Every time I create it (under Report > Animation), the scale factor is reactivated to some arbitrary value EVEN if I deselect it or specifically...
View ArticleMixing two materials
I'm trying to simulate the behavior of a model made of a material which is a mixture of two materials available in the library. The materials are mixed in unequal proportions. I'm able to calculate the...
View ArticleT amb in surface to surface radiation module
HI ! I just had a doubt in the following model,www.comsol.com/showroom/documentation/model/494/ why is T amb for "surface to surface radiation" boundary has different values ... ? even though for an...
View ArticleHeat transfer simulation result is much larger than experimental result
I modelled the heat transfer through a hollow brick to calculate the equivalent thermal conductivity. So general heat transfer and weakly compressible Navier-Stokes modules were taken to build the...
View ArticleSome comments on pA material absolute pressure and CFD gauge & reference...
For those interested in pressure definitions As I read often comments on the Forum, and I heard many questions on the last workshop at the Milan conference on CFD pressure, gauge, absolute, reference...
View ArticleLocal Edge System
Hello, I'm trying to implement a "Predescribed Displacement" Condition on an Edge using the local Edge Coordinate system. But i have the Problem that i couldn't find a reference to the "Local Edge...
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