Changing geometry and plotting the results in graph
I am simulating a 2D inductor coil in ACDC module , but now I want to change the air gap of the two coils in steps and want to calucalte the value of inductance over these steps of airgaps. I have...
View ArticleUsing the assembly form
Hello, I am trying to simulate with "piezolectric devices". Specifically, I would like to exert stress on a thin film in contact with a piezoelectric 3D block. The geometry is quite simple but in order...
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 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 ArticleModeling a Dielectric as a Real Capacitor
Hello everyone, I am having trouble modeling something. I would like to look at the conduction/conductance/resistivity of a insulating/conductive composite. It could be thought to be like a...
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 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 Articleelectric field and potential distribution
Hi I have been working on a 3D (AC/DC) model of a insulator, and I am trying to verify the uniform potential and field distribution along the insulator surface. I apply 33Kv voltage at HV end. I got...
View Articleresistivity plotting
Hi I am running a stationary model of a wire network usinf Electric currents and Heat transfer in solids . Each copper wire (linearised reistivity) has a constant current. There are heat losses to the...
View Articlecalling a waveform from Definition node
Dear all, I want to apply AC voltage to an electrode. I built my desired stimulation waveform from Definition node. How can I call this function? Do I have to enter function name in Electric Current...
View ArticleThermal expansion
Hello! I'm trying to simulate the thermal expansion of a solid silicon block, which is cooled down from 293.15K to 80K. Heatflux or something like that is not important, I'm just interested in the...
View ArticleLinearly Polarized (LP) modes
Hi all, I'm willing to calculate linearly polarized modes, that is, modes with only four non-zero components and azimuthal symmetry in a multimode optical fiber (see for example...
View ArticleHow can I define an PML in model solids mechanics ?
I need a help ! I'm using a model of a small rectangle onto a large rectangle 2D axisymmetric to denote of wave propagation I have to put the PML absorbed wave to not be reflects But when i put it and...
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