Ferrofluid concentration gradient
Hi I am trying to simulate the concentration gradient of ferrofluid in a microfluidic channel. but I can't find the material in the library.. is there anyone know how to choose the material ?thank you :)
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Simple Electric current simulation (Capacitor)
Hello Everybody.I want to model a capacitor inside of near vacuum chamber, two electrode with one side of high voltage and the other side with ground. In between the plate, there are vapor (low...
View Articledefine the attribute of material
i am a noviciate of comsol, i want to define the variable refractivity of material to simulate the reflentance with the wave optics. the refractivity was defined by interpolation function, but it meet...
View Articlephase change of powder-liquid-solide
Hello everyone! I'm trying to model the laser melting in the additive manufacturing which means I must have the correct phase change in the system. I want to model phase change of powder-liquid-solid...
View ArticleFinding total volume affected by certain temperature value in time dependent...
Hi,I am trying to determine the total volume using intop1(T>myvlaue). But it gives the volume at each time step. But I want sum of total volume affected at all times steps together. any suugstion?
View ArticleSave soluation after cancelation
Hello, I want to ask, if there is a way to get and save the solution when I cancel/abort the simulation by myself. Thanks in advance for your help.Greetings, Kant
View ArticleForce&Torque Analysis Between Permanent Magnets and Motion Simulation
Hello colleagues.I work with magnetic field based robotic system and currently using COMSOL for magnetic field simulation regarding permanent magnet and coils. Now I am looking for sort of advanced...
View ArticleTangential stress
I'm solving a 2d analysis of a tunnel. How can i import cylindrical coordinates in to the analysis?How can i find out the tangential stress on the annulus in postprocessing?
View ArticleExcluding Interior of Domain in Induction Heating Simulation
Hello,I recently came across the tutorial called "Iron Sphere in a 13.56 MHz Magnetic Field" (https://www.comsol.com/model/iron-sphere-in-a-13-56-mhz-magnetic-field-12835) and it was quite useful it as...
View ArticleTotal 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...
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