Total volume affected by Some temperature value in transient thermal analysis
I am solving a transient thermal model and need to find the total volume affected by certain temperature value. when I am using volume integral operator intop1(T>myvalue). it gives me a table of...
View ArticleMolecule dipole
Hi I am doing a simulation on molecule dipole transport in a charged tissue. I am very confused by how to model a molecule dipole in comsol. Is there anyone who have suggestions? Thanks.
View ArticleProblems with time-dependent on 3D coils
Good afternoon,I'm trying to study the time-dependent on 3D coils, through the example "Magnetic Field of Helmholtz Coil", in order to observe the inductance in one of the coils through the other....
View Articleis it possible to change the time step with my own values?
hi, i would like to know if is it possible to change the time step with my own values? I am new in Comsol and i will so grated if you can answer me :).
View ArticleBoundary conditions w/ Navier Stokes module
I am using the Navier Stokes module and am setting a Wall, Slip condition at a boundary. However, I would like to have non-zero normal velocity at this boundary, but the default is zero. Is there some...
View Articlecreate surfaces from text archives
I need to create surfaces from points x, y, z of txt files, however I can only create graphics and not surfaces in the geometry branch. Can someone help me with that? I have comsol 5.0 I could create a...
View ArticleDiffusion in a solid cylinder
Hello!I am trying to map the diffusion in a cylinder with the parameters of .25 dia / 2 length ( -1 to 1), specifically to understand the effects of removing boundary conditions and the effect this has...
View Articleconstraints in structural module
HiI try to apply constrint in structural moduleI make rectengular shaped model in 2D and applied the prescribed displacement.and I want to stop when the stress or reaction force reached specific...
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Simulation with large deformation beam
I am doing a simple simulation of large deformation beam. I made a 2D Al/Ox bimorph and apply thermal expansion with delta T = 300K. I should expect the bimorph would curve into a perfect arc.Just like...
View ArticlePrescribing current density obtained from previous step.
Hello! I have a complex geometry and at Step 1 would like to prescribe total electric current entering this geometry and solve for current density distribution within this geometry. I believe I can use...
View ArticleDefining Objective function in Optimization
I have an already working simulation in COMSOL and want to extend it to include optimization but have difficulty in defining Objective function. always get an error message ".... undefined" although...
View ArticleTransport of diluted species coupling with a previous study
Hello everyone,I'm having some trouble coupling two different transport of diluted species studies. The process is like this:First: In study 2 Time dependent, I run TDE for one specific hour...
View ArticleWhy does it take forever to cancel an operation?
The below post is related to an archived discussionDoes anyone know why it takes so long to cancel an operation? Some times longer then an hour.
View ArticlePlease somebody help me
I want to design a simple buck converter in COMSOL. I have face a problem using comsol. As there are four terminals of MOSFET Drain, source , gate and bulk. Now the problem is how to give pulse wave...
View Articleusing Coil Geometry Analysis Step
Hello!I'm trying to find magnetic field distribution due to current flowing in a curved conductor with variable crossection shape and area. I know only total current flowing through conductor, and...
View ArticleShape factor of multi-linear separation of decohesive setting & penalty factor
Dear Comsol users,I noticed that for decohesive settings tag, there is a parameter λ called shape factor when multi-linear seperation is selected. Could anyone please give some explanation on this?...
View ArticleCoupling Electrostatics and Creeping flow
Dear all I am nearly new to Comsol and I'm involved in a project which is similar to yours for connecting electrostatic module to creeping flow. I’m simulating a microchannel in which a particle is...
View ArticleHow to apply current excitation on a single-turn inductor?
Hi everybody,I would like to add an excitation signal to my simple inductor but I am very confused how to do it. I have read the ACDC reference manual and several online notes, but none of them seems...
View ArticleRegarding microwave heating
The following error keeps coming when I try to simulate microwave heating of metals. can anyone tell me where I'm going wrong? I'm a...
View ArticlePhotodiode internal quantum efficiency
I am trying to calculate quantum efficiency of a photodiode. Firstly, EM analysis is done to get optical generation rate. All photons are absrobed as I see. Then, optical genration rate is used as an...
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