Temperatures calculated but thermal expansion calculation is missing ?
I generate a quite simple 3-D model: A cylinder made of copper with a radius of 0.2m and a height of 0.5m and heated at its mantle with a total energy of 1000 Watts for one hour. Within this cylinder...
View ArticleFrom a NifTi Brain Model to COMSOL Bioimpedance simulation
Hi, I have got a model of the brain from MRI images, the segmentation is done, what I need is to create a mesh that can be imported in COMSOL Multiphysics, I already have the materials and their...
View ArticleThermal Stress: temperature response to heat pulse
Hi all, I'm pretty new to COMSOL, i'm trying to simulate the thermal stress response of a small Si [100] chip cooled down to 100mK, with a pulse heat source on a certain point/domain. The model is as...
View Article3d elasticity
Hello! I need to simulate structure like a mattress: 2 surfaces connected with periodically distributed thin rods, 3d elasticity problem. When building geometry following question arose: whether it is...
View ArticleHow 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 Articlemems
How to select domain in imported file from catia..it is showing only as single domain..but geomentry consist of three parts
View ArticleCOMSOL incapable to calculate static pressure in a confined fluid?
COMSOL incapable to calculate static pressure in confined a fluid volume and its interaction with the confining container walls both resulting from differing thermal expansions ? I'm a bit surprised,...
View ArticleSelection of default Eigen-values
How does the Eigen-value solver decide which variable/parameter to use as its Eigen-value?
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 ArticleNon-Isothermal flow module issues
Hi, I am trying to model a single channel of a typical pressurized water reactor, considering three physics, the point kinetics model for the calculation of energy generated inside the fuel pellet, the...
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 ArticleException thrown with Livelink Model - Can anyone help?
I am getting the following exception with my LiveLink model with MATLAB but I can't figure out why. Help would be very much appreciated. I have attached the file. ??? Java exception occurred:...
View ArticleException thrown with Livelink Model - Can anyone help?
I am getting the following exception with my LiveLink model with MATLAB but I can't figure out why. Help would be very much appreciated. ??? Java exception occurred: Exception:...
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 ArticleCross-Channel Flow in a rectangular geometry
I am simulating the flow in a single screw extruder. I simplified the geometry by unwrapping the material from the screw channel. Therefore the geometry of my simulation is rectangular (Inlet and...
View ArticleElectrostatics and Electric Circuit
I am relatively new to COMSOL. I am trying to simulate a two part problem. 1. An electric pole is placed underwater 2. A circuit is built around it to measure the voltage drop across a resistor The...
View ArticleHow to access the exact solution (Mode analysis)
Hi everyone, For mode analysis, by setting the computation domain large enough (i.e. 8 lambda*8 lambda), the obtained results are varied as increasing mesh density, so I am just stuck are there any...
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 ArticleHeat Transfer
Hi everyone, I have a simple problem regarding heat transfer. I have a simple rectangular hollow box and want to set the box temperature say (100 [degC]) The box is filled with air. I placed a copper...
View ArticleSolving four coupled differential equations
Hi, There's an energy equation I need to minimize. This equation is the first equation on this page: www.ee.ucl.ac.uk/~rjames/modelling/constant-order/oned/ However if you follow that page then you...
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