Modelling laser ablation in COMSOL
Hi, I have a fairly simple question about COMSOL. I have made a model in which a block is heated by a pulsing laser heat source. I am using an iterative approach to solve it by solving for each pulse...
View Article"Internal error in boundary respecting." and "Out of memory during assembly."
Dear All I have two errors in my microfluidic models about "Internal error in boundary respecting." and "Out of memory during assembly.". At first I tried to simulate the flow of the overall 3D...
View ArticleCalculating the net generated energy
Hi all, I am using the Joule Heating module, so in my 3D structure there is both energy generation due to Joule Heating and loss due to convective and radiative heat flows. Maybe it is also a good idea...
View Articlelight simulation
Hello everyone, I try to simulate the light diffusion providing from a scattering optical fiber. The source is a LASER light (about 630 nm) . I define 3 geometries : - the block which contains the...
View ArticleSimulation error
Hi , I am getting this type of error whey i am trying to start simulation. "Variables property does not include all variables in Xmesh" Could anybody can give me any solution/ suggestion. Thank you...
View ArticleHardware Question
I've read through several posts and am cognizant of the RAM/cpu core guidelines on performance. With that being said, is there a limit on the priority that should be placed on RAM/core when specifying...
View ArticleMemory usage
Hi everyone. I have a few questions. 1. Is it possible to put the calculation on pause? 2. Is it possible to save some intermediate state of the calculation? (for example, after the 2nd iteration to...
View ArticleJava Runtime Environment error
Getting following error, A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x0000003da3efbc6c, pid=6909, tid=46912497239488 # # JRE version: 6.0_20-b02 # Java VM:...
View ArticleEigenvalue in constraints
I need to solve a PDE eigenvalue problem in which the eigenvalue appears in the boundary conditions (constraints). I am aware that the documentation states that "the eigenvalue itself is not supported...
View ArticleHow to apply AC voltage
Hello, Can some one tell me how can i apply the AC voltage in basic Busbar Tutorial in version 4.4 Thanks Best Regards, Ahmed
View Articlesurface integration for parametric sweep simulation
Hi all, I have performed a stationary electric current simulation with parametric sweep. I need to find the total current passing through a surface of my geometry and for the aim I have used the...
View ArticleVariable modifications between solution iterations
I'm developing a transient model using the Livelink interface. The model first calculates an initial solution for the first time window, then I would like to modify the state variable values due to...
View ArticleERROR: nonlinear solver did not converge, when simulating ball movement in...
Hi all, I have seen several threads about this error and tried to figure it out myself using the sample cases but I still fail to simulate this. Any help will be greatly appreciated. I am trying to...
View ArticleSome 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...
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