Find Inertial Modes, Eigenvalues for a Sphere of Fluid
I am new to Comsol and I am trying to find the eigenmodes of a rotating sphere filled with water in the rotating frame. I have specified the sphere filled with water with free slip walls, specified...
View ArticleApplying AC voltage
Hi all, I'm currently studying the electromechanical effects of a water droplet under AC/DC voltages. The water droplet is placed between two rectangular electrodes. I've applied a electric potential...
View ArticleError: Internal error: cannot convert ElemStruct to int.
Hello, Today I try to run a new Comsol model,and the same error occurs, Whenever I try to run the study of the model I get the same error as you. But there are no errors occur when I run other models....
View ArticleTransport of diluted species and electrostatics
Dear Community, I am trying to combine the physics of the poisson equation (electrostatics) with the nernst-planck (transport of diluted species) in Comsol 4.1 for like 6 weeks now, and all I get is...
View ArticleEigenvalue Calculations In RF Module With Perfectly Matched Layers: Radiation...
Hi everyone, I have one part general info that maybe others will find helpful, and one part question. Here goes: I've been trying to compute the eigenvalues of dielectric GaAs disk structures (embedded...
View ArticleHow to mesh finer in a specific area in 3D
My model is a insulator in 3D surroundded by air, i added a small water droplet on the insulator to observe the electric field enhancement around the water droplet. So i need to focus on the small...
View ArticleSplitting one Geometry in two
Hello, Iam a newy in working with comsol Multiphysics and would be very glad if I could find some help in this forum for my problem. I would like to define two different materials in one geometry. You...
View Articleparameter sweep error when loading a geometry
I am applying a load to the top of the geometry shown while the bottom is fixed but i keep getting an empty parameter sweep error can u help me??
View ArticlePoint Evaluation using Biot-Savart Law.
Hello everyone, I am currently attempting to do a point evaluation with the expression for Biot-Savart Law. The set up is like this: I have an array of points that I would like to get the value at...
View ArticleECT sensitivity distribution maps
Hi, I am using Comsol ver 3.5a Electrostatics module to design my 12 electrode electrical capacitance sensor in 2D. Now i would like to generate a sensitivity map for this ECT sensor but before that...
View ArticleContact problem in solid mechanic: sover don't convert
Hello! I want to simulate a screw in a boneblock which is bonded with a force vertical to the screw axis (see picture). The two blocks are a union with differend materials. There are used 3 different...
View ArticleSwept mesh density dependent of a spatial function
Dear all, I have a simple question: how can I define in swept mesh a function (spatial) of refinement? Just for example, I have a strip and I would have a very fine mesh only in the middle. I have...
View ArticleQuestion about "if" function
Hello, I want to add a volume force to NS equation with a special condition. The volume force is like this: H/Re Re is reynolds number. u2 is calculated from convection-diffusion equation and I want to...
View Articlestress tensor-elasticity matrix
COMSOL assumes the elasticity matrix to be symmetric. I need to define an unsymmetric stress tensor but seems that it is impossible in COMSOL. Has anyone experienced such a problem so far? Thanks
View ArticleConvergence problem with Open Boundary condition - No viscous stress
Hi, I'm modeling fluid flow through a 2D porous media using Darcy's Law. I intend to estimate fluid flux values across the top boundary of model, however,my desired outputs will be one in which the...
View ArticleError: Undefined value found.
Hi, I am simulating a nano antenna in RF module and I get this error: Undefined value found. - Detail: NaN_or_Inf_found_when_solving_linear_system_using_SOR I also simulated the same model in 2D...
View ArticleHow to mesh this concrete slab with embedded loop
This is a concrete slab with embedded loop. I don't want to use the free tetrahedral to mesh this model since the result is not as accurate as quad element do if the order of the shape function is the...
View ArticleHelp for my case!
Hi, I am new to Comsol, and I want to simulate a water droplet falling down and pass through the 2mm gap between two circle particles. (see attached file) the important thing is that I have to consider...
View ArticleUndefined value found.
Hello, when I solution emw, it has a error : Undefined value found. - Detail: NaN_or_Inf_found_when_solving_linear_system_using_SOR what's this message meaning ? Thank you!
View ArticleWhat is convergence?
I'd just like to know what convergence is - in the context of COMSOL.
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