Specifying a rotating boundary condition
I would like to simulate a rotating wall condition. For simplicity, imagine a square box. On the top surface of that box there is a circle. Inside of the box is a viscous fluid. I would like to impose...
View ArticleViscoplasticity: stationary and transient modeling
Hi! I am trying to work on a model that has both viscoplasticity (Anand model from the Nonlinear Structural Materials Module) and contact. First, it seems like I'm having penetration. A stationary...
View ArticleDisplacement between two points
Hi I am very new to COMSOL and I am having trouble with calculating the displacement between two points. I'm using the structural mechanics module and I'm applying a body load to a an object and I want...
View ArticleApplying weak constraints in Darcy's law
Hi, I'm working on vapor intrusion modeling from subsurface into the overlying building. I have a large domain (100m X 100m) and a building (10m X 10m) with 2m basement is locating at center of the...
View ArticleScattering off a gold tip
Hey everyone, I'm having trouble with my model and was hoping someone could help me out. I am trying to model what happens when a frequency of light washes over a small tip of gold. My model is very...
View Articleinduced current in a loop, but with symmetry plane
I'm studying the induced current in a loop of wire from AC current driven in a nearby wire. The symmetry of the fields should allow for cutting the model in half, but I'm not sure of the BC's to use on...
View ArticleDisproportionate Number of Degrees of Freedom
Hi All Using an adapted mesh roughly numbering 2 million mesh elements, the solver calculates based on 14 million degrees of freedom which is outside my RAM capabilities (48Gb). When using a normal...
View Articlehow to limit the temperature below the melting point and also how to deal...
Hello I am dealing with a coupled problem of magnetic field and solid mechanic including plasticity deformation. As the copper is heated, the initial yield stress is reduced and also temperature...
View ArticleNanoparticle Growth
I have started working on nanoparticle growth kinetics and nucleation of the metal atoms. This is my first experience with COMSOL. I want to know how to start things off. Even a simple model is fine. I...
View ArticleHow to input AC E-field to the system?
I'm a beginniner in COMSOL. I think my questions is a little bit silly to ask, but I don't know how to proceed without help from your guys. I want to establish simply a system of two plate electrodes...
View Articlemicro-ring laser simulation COMSOL 4.3a
Dear everybody, If I want to simulate a micro-ring as a laser and a bus waveguide near it as the output coulper, which model should I use? Which solver? And how to set the input and output ports? How...
View Articleslip boundary condition
hello everyone i want to use slip boundary condition in channel flow with the upper plate moves. how can i write it with lattice boltzmann method? thank you
View ArticleLaboratory Plate Shaker
Hi everyone Im new to comsol, I have had some experience with Microfludics module. But now I need to simulate the velocity profile in a laboratory plate shaker (used for denaturing protein-protein...
View Articleissue with 2D couette flow of a Newtonian fluid.
Hi, I'm trying to solve a very simple problem which is a 2D couette flow of a Newtonian fluid. I made the geometry and have specified the boundary conditions. v_outercylinder = 0 vx_innercylinder =...
View ArticleMulti-Turn Coil Domain with Form Assembly goemetry
Hi everyone, I'm modelling coils using the Multi-Turn Coil Domain - I have a transmitter coil with an applied current and two receiver coils beside it. I have to find the induced voltage across the...
View ArticlePhase calculation related error due to incorrect boundary conditions?
I am trying to simulate a metal insulator metal fishnet structure which in infinite in the yz plane and the TE polarized wave propagates in the z direction. I have applied PEC on the planes (xy planes)...
View ArticleScattering boundary condition and port with plane wave
Dear all, I want to simulate the periodic nanostuctures on silicon. now i am using comsol 4.3a version which is not supported PML with port boundary. for that i need to define the Scattering boundary...
View ArticleDifferent results of Simulation from Solid Mechanics and shell
Hello, I have a problem when doing a simulation with a bend pipe meshed by shell element. The results of principal strains are one time larger than meshed by solid mechanics. But the results of...
View Articleactivation energy as a function of the local electric field E
Dear all, I'm simulating the movement of charged species using Nernst-Planck module. Defining the Diffusion coefficient; I would like to define the activation energy for diffusion as a function of the...
View Articlesequencing solver
Hi, I am simulating fluid flow and heat transfer in a cylindrical pipe. what i need is a very long term simulation (i.e., 25 years) and I am using pipe flow module which assumes the pipe and 1D and the...
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