Integration with variable limits
Hi, I am trying to solve a problem which requires that I define a function in the form: V=-Integral of E(x) dx from x=0 until x=x the function V is used in the coefficients of the equations which I am...
View ArticleElectromagnetic Periodic Boundary Condition
Hi all, I am trying to simulate a 2D periodic electromagnetic structure using periodic boundary condition in comsol multiphysics. the whole structure is 3D but it has 2D periodicity in x and y...
View ArticleHow can I export an eps image (vector graphics)?
Hello, I would like to export an image of the model geometry as an .eps file (vector graphics). I could not find how to do that and it seems that the only options are jpg, png and bmp. Thank you.
View ArticleDifferent meshes for a multilayer
Dear all, I have to implement in Comsol a multilayer, that has a first layer (100x100x2 [mm]) with fillets and a second layer (140x140x3 [mm]) that is a uniform parallelepiped. To mesh the second layer...
View ArticleAbout finer mesh creation
Hello everybody, I had some questions about mesh creation. Except for defaults, what is the main principles for Minimum angle for splitting, Maximum per split, and layer decrement when creating...
View Articleintegration till a point of the model
I intend to integrate a variable varying in a circle till a point r where point r is less than radius of the circle, for all values of r >0 to r<=ro (radius of circle). Can someone help me out...
View Articleincident electrical field Ei
Hello, In order to calculate the coupling efficiency of PFC (photonic fiber cristal) , I would like to know how to set aninput of incident electrical field Ei (the input Gaussian beam: wave...
View ArticleHeat Generation From Impact
I am attempting to model the heat generated from the impact of two metallic spheres. I was able to solve the structural mechanics portion of the problem, but I am having trouble coupling the heat...
View ArticleHow to calculate transmittance with a point source
Hello, I am calculate transmittance with a point source. and I find it difficult to define the input power value of the structure. So I wonder if there is any accurate method that can be used to...
View ArticleThere is a very interesting PDE. Can any one help to solve it using COMSOL?
In the attached file, the equation is shown there. It is in a nonlinear form. We need the numerical solution to finish our class project, so solving this equation is very important for us. Could anyone...
View Articlespiral coil
Hi I am trying to model a spiral coil in 3D. the coil wire is of rectangular cross section and tightly wound so that there is a very thin gap between windings and it is filled with epoxy. It is not...
View Articleproblem with "zoom in" to see a very small structure
Hello, I was using the similar model as a " Copper Deposition in a Trench" in model gallery, just different in dimensions. I need the distance between Anode and Cathode to be 65 mm, and depth of the...
View ArticleElectric Currents Boundary Conditions Question
Hello, I am a relatively new user of Comsol, and I am trying to learn to use the electric currents Physics module. I want to model two copper cylinders with a contact resistance, and 1V applied across...
View Articledouts in comsol 4.3 version
Dear Sir, Iam using comsol 4.3 version for pipeline inspection modelling (3D), We have one doubt , we would like to move the coil from one place to another place by step by step,Is it possible to move...
View ArticleExtremely thin geometries
I created a cylinder with radius 1e-6 m and thickness 9e-10 m in 3D to make a continuum simulation of graphene. I have initial radial stress, an uniform body load along the thickness of the cylinder...
View ArticleWhat's Axial symmetry 1?
Hi, everyone I think people using 2D axisymmetry mode know the default Axial symmetry 1 condition. I feel this condition strange, as most of time there's no variable, no weak expression or no...
View ArticleHow to setting cross section value?
Hello I have a problem to setting cross section value. My flow result found back flow but when I cross section result graph don't show negative value of back flow. How to setting? Best regards.
View ArticlePiezoelectric Devices with Electrical Circuit Help
Hello - Ive been using COMSOl for about 6 months, and working with Piezoelectric devices. I recently upgraded to the ACDC module to include SPICE models with my piezo component models. I would like to...
View ArticleHow to create a crack in 3D iron plate
Hi everyone, I'm trying to simulate the Eddy Current Thermography Testing to detect the crack on the surface of material. My problem is that I don't know how to create the crack on the surface in 3D...
View ArticleModal Mass calculation
Hi Is it possible to calculate the modal mass for a particular mode shape? Can someone please explain how to do it.
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