Pleasse help me.
Good day. Would somebody be so kind as to send me a model ID 14191? Thank veri much. goodbye
View ArticleFind 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 Articlecomsol 4.0 how to have unequal scaling on different axes
In comsol 3.5a, i could selected under options->axes/grid settings the option that the axes not be equal. I have problems where dimension along one of the axis are microns while along the other axes...
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 ArticlePeriodic Pulse
Hi I an working on Joule Heating and would like to generate 3 repeated voltage pulse Conditions: Pulse Width: 100e-9 Rise and fall: 10e-9 Period: 150e-9 This is what I tried Rect1>> Lower Limit:...
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 ArticleHow do materials properties are considered in k-epsilon turbulent model?
Hi everyone, I have a doubt about how material properties are considered in k-epsilon turbulent models. I'm simulating air flow around buildings and I specified materials for the ground and the...
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...
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