How to set initial velocity in level-set method two phase flow for one phase
Hi guys, I am trying to set the initial velocity for a droplet as fluid 1, how can I set an initial velocity for the bulk of fluid (for example the the continuous phase or the drop) in level set...
View ArticleRunning the simulation for the required time span in more than one times (loops)
Dear sir, My requirement is "Running the simulation for the required time span in more than one times (loops)". I actually do not know the initial values of temperatures of the room that I am going to...
View ArticleMarangoni Stirring / Phase Change: Weak Contribution Settings
Hi I have a problem with a weak contribution in a laser surface melting model: My model takes into account solid-liquid phase change using an enthalpy-porosity technique and liquid phase volume forces...
View Articleparticle deformation througn a contrained channel
Hi there, I am doing COMSOL simulation to see the behavior of a particle flow through a microchannel. There is a area of the channel where particle size is greater than the cross section. So the...
View ArticleDuplicate variable name
Hello all, I got some duplicate variable name error when computing my model(see the attachment), which including the piezoelectric device, laminar flow and deformed geometry. Should I use the physics...
View ArticleFluid Flow in U-loop
Hi everyone, I have modelled a U-loop with water flowing through inside in 3D, with three different sections (two cylindrical lines and one half of a torus at the bottom). But COMSOL only calculates...
View ArticleRunning FSI examples, "undefined value found"
Hi!, i am trying to run an fluid-structure example with use of the MEMS module, byt anytime i get the error "undefined value found..." for the variable mod1.v_solid. So i even downloaded the 2d fsi...
View Article3D geometry imported mesh
hello Saeid, sorry for the later response. was on holiday for about a month. i am using COMSOL 4.3a. i just checked with my computer. It's possible to follow...
View Articlesloshing tank problem with solid structure
Hi all, I was trying several to do the "sloshing_tank" model with container which is elastic material. when I add the container with the sloshing_tank geometry, the free fluid surface did not show- as...
View ArticleHow to assign different values to dependent variables
Hi, I am just wondering that how it is possible to assign optional values to the dependent variable in some part of the domain ? I always get "Duplicate variable error". Actually I am trying to put...
View ArticleOne way coupling- A reasonable approximation?
In the tutorial for FSI in a network of blood vessels, it has been narrated at the end in the results and discussion section for Figure 5. " The displacements are in the order of 10um, which suggest...
View Article3D laminer vortex
hi, I am simulating a block which filled in water, and there is a cylinder prevent the water the block.(the diameter of the cylinder is smaller than the block) I am using laminer flow and hoping to see...
View ArticleError about 'Failed to find consistent initial values. Last time step is not...
Hi, I am a new user of COMSOL. I've set up my reactor geometry model and successfully applied the turbulent flow (stationary condition) in my reactor model. However, when I try to simulate my reactor...
View ArticleMovement of air due to thermal expansion
Hi everybody! I'm trying to simulate the movement of the air in 2D and I only get errors. I use two physics: laminar flow with heat transfer. I've created a square full of air and I put easy boundary...
View ArticleError-Automatic remeshing
Hi, I encountered a problem about "Automatic remeshing" with "deformed geomerty" and Time-Dependent Solver When I ran the program, Comsol always displayed a Error: Unsupported operation on this type of...
View Articlehow to enter a Channel thickness
Hi everybody, how to enter the Channel thickness? I use the (laminar flow -> mass flow -> mass flow rate -> normal mass flow rate), but get an error! I read a comsol documentation and I think...
View ArticleHow to Improve Convergence in Natural Convection
I am wondering how I can improve convergence in my natural convection model. It is a simple model; an isothermal aluminum plate in water. The model starts out fine but as the run continues (transient...
View ArticleSimulatneous temperature distribution...!
Dear Comsol Users, I am willing to come over to you again, this time with some questions I would like to be enlighted. I've built a 3D heat exchanger (coil) inside a material (cylinder) and with...
View ArticleRunning the simulation for the required time span in more than one times (loops)
Dear sir, My requirement is "Running the simulation for the required time span in more than one times (loops)". I actually do not know the initial values of temperatures of the room that I am going to...
View ArticleMarangoni Stirring / Phase Change: Weak Contribution Settings
Hi I have a problem with a weak contribution in a laser surface melting model: My model takes into account solid-liquid phase change using an enthalpy-porosity technique and liquid phase volume forces...
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