Some help for a COMSOL beginner ,Friction contact between two bodies
I want to change the tutorial "wrench" setup so I can analyse the stress in the open end of the wrench. In the tutorial the wrench and the bolt are one part. My steps until now: Split the parts in bolt...
View Articlehandling thin geometries and convergence problem
Hello, I am trying to simulate Joule Heating analysis for a very thin geometry (description- 3 domains over each other with different materials respecectively,each have certain thickness) Please check...
View ArticleThermocapillary recirculation
EDITED Hello, I am a beginning user of COMSOL. Currently, I am trying to create a preliminary model of Marangoni convection, like this one available on the COMSOL site:...
View ArticleError: Internal error: cannot convert ElemStruct to double
Hi everyone, Since this morning I have this error on my computer for all simulations where I use periodicity boundary conditions: Error: Internal error: cannot convert ElemStruct to double. It involves...
View ArticleProblems in assigning inlet-outlet boundary condition for a two phase flow
Dear all, I am trying to simulate a laminar two phase flow passing over a cylinder with a phase-field model where the cylinder is submerged into the water (heavier fluid), as a part of my project. I...
View ArticleIterative solver and gauge fixing
Dear Colleagues, I sincerely hope you are all doing fine. Could you be so kind to advise me on the following issue, please? The problem I have is quite an ordinary induction current problem in 3D with...
View ArticleNavier-Stokes Simulation using General Form PDE: The Continuity Equation
Greetings all. I am working to solve a standard fluid flow problem (e.g. flow in a pipe as a start) using the General Form PDE interfaces instead of the Fluid Flow built in GUI. I am able to define a...
View ArticleConjugated heat transfer - no convergence
Hello! I am modelling a heat transfer problem coupled with convection in a fluid using the conjugated heat transfer module. My material properties are temperature dependent. The model is time...
View ArticleTolerances and time stepping in transient simulations
Hello, I try to simulate the transient heating (about 2s) of air on top of a small microheater using the conjugate heat transfer model. The temperature of the heater is fixed at 250 °C while the...
View ArticleRename datasets from solver
Hi, I have a complex model with lots of steps. I get completely confused about the naming of the datasets it generates. The only "trick" I have found is that for time-dependent sets I use slightly...
View ArticleTime-stepping
Hi, I would like to run some simulations which use an exponential time step, and I have figured out how to set that in my "range" of solutions shown, but I was also wondering if there was a way to have...
View ArticleParametric sweep solution is lost after non-convergence
Hi, I'm running a time-dependent simulation, using electric currents and solid heat transfer physics. I'm ramping up the current with time, which heats the material. I have included an effect, which...
View ArticleMicrowave heating problem
I have to simulate some materials that are heated in a micro oven, but as the study ends, the temperature profile of the material does not change, it remains on the same inital temperature. What did i...
View ArticleIs it possible to set a minimum number of iterations?
Dear all, I have a question that might sound weird at first. I am doing a parametric study on conjugate het transfer of a parametrized geometry. Including gravity is necessary in this case and as it...
View ArticleHeat Convection with Air and Water
Hello everybody, im trying to do a simulation like in the picture below. What i expect to see is natural convetion in the Air and Fluid based on the density change in the material. I already did some...
View ArticleLink two models PDE and Thermal Stress
Hi there, I am new in COMSOL, using the version 4.4. I am using two model. One is "coefficient of PDE(c)" and other is "thermal stress model". Both are time dependent. The variables I am getting from...
View ArticleProblems Using Particle Tracing for Fluid with Time Dependent Laminar Flow
Hello, I am trying to run a 2D simulation where the Particle Tracing Fluid physics is being run alongside the laminar flow physics as they are both time dependent. However when I run them I keep...
View ArticleOne way multiphysics coupling within a transient simulation
Hello Fellow Users, I am solving two physics (fluid flow & species transport) in a transient simulation. The fluid flow is not affected by the concentration distribution. As of now, i have...
View ArticleRun Comsol Matlab using multi processors
Hi folks, I have a question about running Comsol Matlab using multi processors. I have a 3D application that involves turbulent air flow and mass transfer. My Comsol is installed on a cluster. For now...
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