Urgent help in Meshing required...
Hi, Im working on building a rf MEMS switch since past months. The big problem i'm facing is in user control meshing. i'm still not clear what to select under ''size of minimal element, Size of maximum...
View ArticleDisplacement no symmetric
Hi there, I modelled a simple beam under axial load (20N). The strain and stress values are matching with the theoretical results. But there is no symmetry in the displacement results. The displacement...
View Article3D electrocoalescence with multiple inlets
Hi I have based my simulation on the electrocoalescence example except I have two phases coming in at the inlet. As such I have defined an explicit boundary selection for each inlet phase and have two...
View ArticleNatural Convection in a Box
Hi, I'm trying to get that cats eye picture of natural convection in a box. My solution converges but I dont see any streamlines. If someone can spot a mistake that I made, it would be helpful. I am...
View ArticleWeak form PDE Boundary Conditions-Weak Term Edit Field
Hi, I am trying to solve equation that has a weak form: -ux*test(ux)+a*ux*test(u) My boundary conditions are: ux(-L,t) -a*u( -L,t)=0 and same for the other end x=0 I am very new to the Comsol and I am...
View Articlecoding in comsol without matlab
Hi all I am working with different designs of Superconducting coils. As of now for my designs, I am using matlab code for building designs of the coils. I have attached 2 figures. The first figure...
View ArticleLaser heating and laminar flow
I'm trying to build a model to study the temperature distribution within a microfluidic channel. Liquid flows through the channel and heated by a laser beam. I used NITF for my modeling, and enter Q...
View ArticleHow to simulate the Surface roughness for a solid particle
I want to simulate how the liquid to wet solid particle by considering the capillary force and surface roughness. I have simulated the capillary force by level set. but for the surface roughness, I...
View ArticlePDE
I am currently working on COMSOL 4.0a. Can anybody tell me how the variables for stress are defined in COMSOL? Since I want to define a Coefficient PDE, which its diffusion coefficient (c) is coupled...
View ArticleGlobal strength in Solid mechanics module
Hi everybody, I'm using Comsol with the Solid Mechanics module, and I would need to compute the global strength applied to my system. But I can't find how. In the results nod, global evaluation, I can...
View ArticleParameter Sweep on Geometry
Hi everyone, I created a geometry whose dimensions are related to a few parameters which I have been defining under "Global Definitions > Parameters". Now I would like to change some of these...
View Articlebuckling of a beam clamped at both ends with initial stress applied
Hello, I'm a newbie using COMSOL v3.4 structural mechanics mode. I'm simulating a silicon beam (~100 micron long, ~500nm cross-section side) clamped at both ends with initial stress applied (in the MPa...
View ArticleHow to get electrical force in AC/DC module
Hi, everyone! I am building a model in COMSOL. In this module, I build a container full of dielectric, like water. And I will put two electrodes on the opposite side, one 5V, and the other 0V. And I...
View ArticleLine gragh along a cross section shape
Hi I have a cylinderical model. As you know if a cut plane is defined (no parallel with the base plan) cuts the cylinder, we will have an elliptical shape cross section in the boundaries. How I can...
View Article8 points of monitoring the temperatures - how to export to a dat file in one...
Good afternoon, I'm going to make a simulation where I need to export to a file. DAT (or .TXT), eight points for monitoring of temperatures, plus the time step. How to do this? I can only export only...
View ArticleTorque from Shear Stress Integration
Hello, I have been working on a model of a flat plate very near the wall of a duct with air flowing through it. In order to find the forces acting on this plate, I have been integrating T_stress over...
View ArticleTrouble coupling heat transfer physics for both fluids and solids
Hey all, So I'm getting stuck with my model where I try to couple three different physics. The three physics are: Electric Currents, Heat transfer in Solids, and Heat transfer in Fluids. Basically what...
View ArticleSimulation of Stirling Engine
Hello everybody I'm currently trying to simulate the fluid flow in a stirling engine (beta) which I've built from the following video:www.youtube.com/watch?v=X2qssmxA82U You should try building it;-)...
View Articleapplying reaction force operator on an inner boundary
Hello, I'm trying to calculate normal mass and heat flux on an inner geometry boundary (no boundary condition is applied on the boundary) using the reacf() oprator (reacf(p) for mass and reacf(T) for...
View ArticleSolving a nonlinear PDE
Hello, I want to solve a PDE in which the coefficients of the time derivative, space derivative of dependent variable are functions of dependent variable itself. I have attached a pdf file stating the...
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