Quantcast
Channel: Latest Discussions - COMSOL Forums
Browsing all 25631 articles
Browse latest View live

Thermal expansion of a liquid

Hi all, I’m am trying to produce a model of a fluid enclosed on all sides except one by fixed constraints(walls), on the remaining face a thin diaphragm is in contact with the fluid. As such this is a...

View Article


Problem with Convergence

I was running my HT+NITF model for simulation for 2 days. But, still I was not able to obtain the convergence. The progress of my simulation after 2 days of running is as follows (in the picture...

View Article


Convergence problem

I was running my HT+NITF model for simulation for 2 days. But, still I was not able to obtain the convergence. The progress of my simulation after 2 days of running is as follows (in the picture...

View Article

Segregated Solver, Segregated group

What is the meaning of "Segregated Solver" and "Segregated Group"? While computing for the results, I am getting a line like follows... "Segregated Solver 17% Step 3" . And the value beside Step in...

View Article

Ill Conditioned Preconditioner

Hi everyone, I haver been trying to untangle this ill conditioned error with different meshings, which I think is the cause of the error. The temperature distribution in the soil (from 3D plot group -...

View Article


Adapting transport of diluted species interface using mathematical PDE

Hello! I'm trying to adapt the transport of diluted species interface using custom PDE:s in order to open up for further modification later on. I have been trying to copy the functionality of the...

View Article

E or E1 or E2 in my plasma model

Hello, I am trying since some days now to "copy" the microwave heated 2D model to a different geometry. My geometry is axial-symmetric in real. But I first started it in 2D only, but since I am not...

View Article

Variables & Functions in Comsol 4.1

Hi, I am trying to do something very simple that worked perfectly in 3.5a, but that I cannot reproduce in 4.1. I have the feeling that I am totally missing something, but I do not know what. I define a...

View Article


Heat Transfer in Soils

Hi, I am a comsol user and I want to have a 2d axisymmetric model. In my model, I have a soil sample that I put a steel bar in the soil. I want to heat the steel bar with a constant temperature 500(k)...

View Article


Plasticity

Whats the difference between Small Plastic Strain and Large plastic strain? How is a model with contact and friction to simulate? What is important? My models usually have convergence errors when I...

View Article

Imported SolidWorks part doesn't behave correctly

I'm relatively new to COMSOL but I haven't had much luck finding a solution. I had an assembly in SolidWorks made of 3 parts. I created a new SolidWorks part file which had the 3 parts mated together...

View Article

Sloshing Tank with FSI

Hello All I calculate the waves of a water tank and then damp with a structure the waves. At the beginning I start with a single excitation an then wait and just let the gravity do the job. My model is...

View Article

PDE solving or defining force in terms of displacement

Hi, I hope you are doing well, I am a new user of Comsol. At this moment, I am trying to model a cantilever beam with an applied force on its edge as a function of displacement. So, what I need is...

View Article


about helix geometry modeling

Hi, I am trying to model a spiraling geometry (helix-like) with a complicated cross section. Does anyone know how to do it with comsol 4.2/4.3a? I used the build-in "helix" one but that was with a...

View Article

Problem assignment of material parameters (properties) in porous materials

I am using poroelasticity module. There are porous material and fluid in the model. When I assign the properties of porous material or fluid, I need to choose which domain I should assign. The fluid...

View Article


domain deformation while doing moving mesh

Right now i am solving a moving mesh problem where the particle is moving in the domain. i have used moving wall and prescribed mesh velocity for the problem. It is doing fine for sometimes , however...

View Article

How to set displacement from study 1 as prescribed displacement in study 2?

Hey, I have a trouble with defining a prescribed displacement. Let's say that i received displacement of the edge caused by heating of sample. But displacement of this edge is different in every point...

View Article


how to make sure the soil is saturated

I am using poroelasticity module, how to make sure the porous media is saturated? is there any configuration to attain the totally saturated condition for porous media? thanks

View Article

water flow in a hydrophobic tube

Hi, I want to simulate water flow inside a tube. This tube has surface tension of 30.35mN/m which is high hydrophobicity. For now, I only able to simulate just the water flow itself. I don’t know how...

View Article

Importing real data heat flux boundary condition to COMSOL

Hello all, I'm working on a 2D transient heat transfer project and I can't figure out how to import real data for heat flux vs.time in COMSOL. It only allow me to input a fix value or function, not...

View Article
Browsing all 25631 articles
Browse latest View live