Convergence 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 ArticleHysteresis loss Modelling of Inductor coil
Hello I have simulated inductor using AC/DC module and I have calculated the inductance and magnetic field around the inductor but now I want to calculate the hysteresis loss in the inductor. For that...
View Articlecoupling solid mechanics with magnetic fields
Hello, I'm currently trying to analyze the change of magnetic flux that is made by a 3D magnet that is adjusted on a periodically moving beam. (Physics: SOLID, MF and Time Dependent) But unfortunately...
View ArticleCreep - Plasticity
I want to use the non-linear structural mechanics module for simulation of plastic deformation by yielding. There is a creep module and a plasticity module. In the creep module, I find more suitable...
View ArticleAdding points and lines to 3D models with parametric surfaces
Hi all, I was wondering if there is a way to add a point or line to a model in which I have a 3D block with the top surface replaced by a parametric surface derived from a DEM (digital elevation...
View Articlehow to assign conductivity to fluid flow in a microchannel preconcentration...
I am modeling a solution phase preconcentration in microchannel. My system has two inlets and one outlet. From inlet1, buffer (10mM) containing a negatively charged dye is supplied and from inlet2 same...
View Article3D waveguide in time domain.
Hi, I am trying to model a 3D waveguide and I am using a Gaussian pulse and I need to define an excitation port for the model. I can do this in 2D, but it seems in 3D it is really difficult as far as I...
View Articlehow to apply two phase voltage in an Piezo Divice
Hi, I modeled a piezo actuator driven by two phase voltage that one is 90-degree behind, that is sin(wt) and cos(wt). Now I'm doing a frequency domain study，BUT how could I applied the voltage? I've...
View Article4.3b analytic function Bug?
Is there a new way to define an analytic function in 4.3b? 4.3b gives me an error - funcname is a string (when I'm trying to plot it, when two copies of the same mph model opened). Also Gauss function...
View Article3D Model of "Voltage Induced in a Coil by a Moving Magnet"
Hi I wanted to do the 3D version of the Model "Voltage Induced in a Coil by a Moving Magnet" which is in the Comsol Library. I used the same physics, materials and boundary conditions, but...
View Article3D waveguide (time domain simulation)
Hello, Does anyone know how to overcome this problem when I am dealing with a 3D waveguide modeling? When I am computing, this msg appears " Operation cannot be performed on data set cpt1 (cut point...
View ArticleSystem of PDEs with mixed order
Hello, I am trying to solve the attached system of PDEs using the general PDE interface. However, I always get a singular matrix error. What am I missing?
View ArticleObstacle in fluid flow
I am new to comsol. I am working on a problem of deforming obstacle in fluid flow. I need to account for velocity of obstacle due to drag of fluid and plot the velocity field when steady state is...
View Articleeffect of temperature
i have designed a one port saw resonator and i want to see the effect of temperature on its various parameters such as admittance etc how can i include the effect of temperature . please help
View Articleproblem in membrane deformation simulation under pressure
Hi. I am simulating a spherical membrane deformation under hydraulic pressure, in which the liquid push a thin layer of solid to have deformation. I have included physics of laminar flow and fsi....
View ArticleUnable to implement moment on the system!
Hi, I am simulating a model of a structure which has a central rotating shaft and other components attached to it. The shaft is rotating by a motor and hence the other components should rotate with it...
View ArticleDerived values in different tables instead of in 1 table
Sometimes the derived values are comming in 1 table when doing the clear and evaluate all. But sometimes all the different values are comming in different tables which is not usefull to work with (copy...
View ArticlePML and RF Module
Hi, I am trying to find the eigenmodes of a grated ring waveguide. To do so I simulate a segment of the ring and use periodic boundary conditions. Since light should be radiated upwards and downwards...
View ArticleCombining particle tracing and rotating machinery modules
HOw do I combine the particle tracing and rotating machinery modules so that they can run simultaneously in a study? I am attempting to study the particle trajectories in a 3-D mixer (the same mixer...
View ArticleNano Optics - Single dipole near infinite interface
I am trying to reproduce far field radiation patterns for single emitters close to an infinite dielectric interface. Namely, I place an emitter in air, in the vicinity of a glass substrate (10[nm]...
View Article