How to create blood cells with different cell parameter
Hi... I am student of Biomedical engineering and very new in comsol. In order to complete my final year project, need to study on separation of red blood cells from whole blood by using magnetophoresis...
View Articleswitching electric AC voltage
Hi, I'm rather new to COMSOL. Is there a way to model a switching AC field between two electrodes? That is, both electrodes are always applying an AC field of the same frequency, but one side is high...
View ArticlePDE's regarding H-formulation
Hi all! I am completely new Comsol user and I am struggling to deal with the Maxwell equations in H-formulation. I am trying to simulate very simple system which consists of superconductor surrounded...
View ArticleNonconvergence of time dependent solver using dynamic compression equation
I am trying to implement dynamic compression to a 2D model using triphasic theory of cartilage, but I always get a singularity problem. The nonlinear solver is nonconvergent in the first time step of...
View ArticleError on convergence plot versus Relative Error
How exactly does the error that is shown on the convergence plot relate to the relative error needed for actual convergence? The plot seems to suggest that the current solution has an absolute error of...
View ArticleHow to do a parametric sweep of solutions in 1 study step to another study...
Hello everyone, I am trying to use a set of solutions from 1 study step (elastic eigenfrequencies) as initial conditions to a separate study step (optical mode analysis). I want to sweep through all...
View Articlesolution coupling
Hello I am working with particle tracing in a microfluidic channel under a magnetic field produced by a permanent magnet. I have tried to couple the stationary solutions of the laminar flow and...
View Articlehow to choose model between 'Fluid Flow' and 'heat transfer' for a simple...
i am doing a basic simulation for heat transfer through convection. I wish to learn about as on how to choose between various models in "ADD PHYSICS" like heat transfer. fluid flow..
View ArticleRF Module: material dispersion for transient simulations
How do I simulate structures with dispersion using the transient solver in RF module? I am new at this, so any examples or step-by-step tutorials would greatly be appreciated.
View ArticleElectric Displacement Field due to mechanical stress after cooldown
Dear Comsol users, I have a problem with a 3D simulation for my Ph.D. thesis. Therefore I would be very grateful if anyone could help me. My model consists of a piezoelectric substrate, two insulating...
View ArticleMEMS RESONATOR 3D: Failed to find a solution. In segregated group 3:...
Hi everybody, I am trying to run the stationary model for a MEMS disk connected to a bar in order to obtain the initial conditions (pre-stress, displacement) to include in the modal and harmonics...
View ArticleUndefined value found in the equation residual vector.
I am trying to model a pem fuel cell. Although I have entered all parameters and values, i have some errors as follows; Undefined value found. - Detail: Undefined value found in the equation residual...
View ArticleCreep Relaxation: Convergence problem in time dependent solver
Hi everyone, I am doing structural analysis of a quarter spherical particle. I am imposing the Temperature field T(x,t) by importing a "text file" as interpolation. These temperature values are...
View Articleproblem in solving
Hello sir, i am doing the thermal analysis of bolometer which consists of substrate, insulating material and infrared sensing membrane. i need to find the transient response of bolometer with the...
View ArticleComplex Band Strucutre - Acoustics/Structural Mechanics
Hi In a typical phononic band structure calculation done within COMSOL the procedure is to define Floquet BC's and do a parametric sweep of the wave vector over a particular direction in the...
View ArticlePlots - Edit Expressions: Normalization to a Certain Value
I have a square, centered in (0,0). After running my simulation, I get the value of the Magnetic Field all over the square. I run a Parametric Sweep. In order to compare my results, I want to plot the...
View ArticleUsing several time studies
Dear Comsol users, I want to use for Comsol for time-depended simulation. And the time-dynamics of the systems, that I expect, is, that there should be first an initial phase with a slow increase of...
View ArticleNeed help about loop simulation via Matlab
Dear All Comsolers, I used to the for loop to do the simulation in Matlab and used mphsave(model,'filename'); to save file and import model back to the COMSOL desktop. However, when I run my model in...
View ArticleUndefined value found in the equation residual vector.
I am trying to model a pem fuel cell. Although I have entered all parameters and values, i have some errors as follows; Undefined value found. - Detail: Undefined value found in the equation residual...
View ArticleError while solving Joule heating: mesh-case 0 there are 665 void equations...
Hi, I tried to simulate joule heating in a copper cylindrical wire with an cylindrical air-void in it. But I am getting following error: Failed to find a solution. Singular matrix. For mesh-case 0...
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