why the graph is a mass of black?
I used comsol to do a simulation of liquid flow through the fiber, but the graph has a big part of black as I attached in the attachment of this email
View ArticleA task melting of basaltic crumbs a plasma unit
There are 3D plasma unit model, some results were obtained. Namely, the temperature distribution and melt boundary. However, the melting process itself, I can not simulate. To install the contents...
View ArticleVelocity profile problem
Hi, In 2d axis,i have a fluid flow project(laminar flow) and i want to implement a parabolic profile (semi/half parabolic) for inlet velocity. I express it at the inlet b.c. as: umax(1-r^2/R^2) where,...
View ArticleTo set up model to calculate the permeability
I want to carry out a simulation with comsol to compare the results of articles and the comsol, the parameters of the model and method of calculation are in the attachment, who can help me solve it,...
View Articlesolving for Diffusivity
I am using the Transport of Dilute Species Module(time dependent study) for my project. In this module I am required to solve for N according to the equation N=-D∇c where D is the diffusivity and c is...
View ArticleGrowing, interacting geometry over time
Hi, I am a TU Delft student and I am trying to simulate the sintering of filaments during the Fused Deposition process. I assume a inintial filament cross section and want to "deposit" four filaments...
View ArticleHow to create a No Flux Boundary condition for one of two chemical species
I'm am modeling a fuel cell using transport of concentrated species (tcs) with 2 species, wH2 and wH2O. In the fuel cell there is a boundary where the water (wH2O) is able to pass through but the...
View ArticleMotion due to a magnetic field
Hello everyone, I am pretty new to COMSOL so this might be a simple question to answer. I want to 2D simulate the attraction between a magnet and an iron bead which are located in air (see attachment...
View Articletwo phase analysis of a bubble of air in water
Hi, I have created a model (see attached) with an air bubble size 8mm in diameter inside a cube of water 17.5mm in size. this analysis converges. When I create the same analysis but in um (meaning air...
View ArticleInternal No-Flux boundary condition
I am modeling a fuel cell with the reacting flow in porous media (rfcs) interface and I would like to make it so H2O is able to transfer through out the entire model, but H2 must remain in the anode...
View ArticleMoving solid particles in a laminar flow
Hello, I want to simulate moving solid particles in a laminar flow with some obstacles (vertical columns) in their way. What I want to see is that how they get trapped in the gaps between the columns...
View ArticleHeat Flow in Urban Building - Modeling Cooling Process
Greetings, I'm new to Comsol, and I'm trying to model a simple shoe-box model for a building, and I'm using a non-isothermal multi-physics model to study building thermal behavior in an urban...
View ArticleConvergence of non-isothermal flow simulation stationary
Hello, i have problems with my simulation of non-isothermal flow (including surface-to-surface radiation, but i think the problem is the fluid flow). The fluid flow is considered to be laminar. The...
View Articleconvergence plot - discontinuous lines?
Hi , could u explain me : 1)what is that error exactly (is it err estimate at log?) 2)why the lines are discontinuous 3)why the lines are disordered 4)what is deduced from this plot about my configuration
View ArticleDiffusion models
Hello, In the module "Transport of diluted and concentrated species" one can model a diffusion. To do that, there is choice out of 3 options: mixture averaged, Fick and Maxwell-Stefan. For my master...
View ArticleMagnetorheological Fluid flow simulation COMSOL
I am also doing a simulation with Magnetorheological fluid following Bingham Non-Newtonian model. Till now I have performed the simulation in a uniform magnetic field using Laminar Flow Module, but now...
View ArticlePressure contour near outlet boundary is variable
Hi, everyone, I employed the COMSOL Laminar Flow model to simulate parallel plate flow. In the Laminar Flow model, I exerted inlet pressure boundary (a constant value) and outlet pressure boundary...
View ArticleLearning meshing, any suggestion for beginners?
I have a complicate geometry and needs to be meshed for microfluid flow simulation. However, I've only used the default meshing method before, which does not work for this current case. How could I...
View ArticleMotion due to a magnetic field
Hello everyone, I am pretty new to COMSOL so this might be a simple question to answer. I want to 2D simulate the attraction between a magnet and an iron bead which are located in air (see attachment...
View ArticleOut of memory during LU factorization.
hi i am using extra fine mesh for my simulation purpose because with normal and fine mesh it is unable to create mesh in my 3D model. while simulation i got "Out of memory during LU factorization". how...
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