Concentration Source Term in Wrong Units?
Hello,I'm trying to set up a 1d, axisymetric, reaction-diffusion problem.I'm using 'coeffecient form' of the PDEMy dependent variable in concentration in [mol/m^3]My source term should be a...
View ArticleCreation of .mphbin file
The below post is related to an archived discussionHi! I am new in COMSOL, I need to know, how to create .mphbin import geometry file in COMSOL 5.3a?
View ArticleHow to solve a series of functions based on the result of each step
Hi, I'm working on a time dependent heat transfer problem. At the end of each time step, I need to calculate some values based on the result from comsol solving nonisothermal model. I need to use the...
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Fluid Flow through a Pipe with Microgravity Conditions
Hello Everyone! I would like to model fluid (water) flow through a pipe with microgravity conditions. I have noticed that in the settings of the Turbulent and Laminar modules there is an option that...
View Articledroplet volume decreasing, when I use two-phase flow Level set method.
Hello Everyone,I am trying use two-phase flow level-set droplet spreading on superhydrophobic surface. However, the droplet volume always decreasing after acheving equilibrium state.Please share your...
View ArticleOptimal shape design of a PZT
Hello, how can I achieve it that I'll optimize the shape of a rectangle PZT to a new shape which can motivate a same vibrational mode with the rectangle PZT. The new shape may be composed of** several...
View ArticleUsing a tesselated surface as an interface in a solid for solid mechanics...
Dear Community and COMSOL Employees,I have a 3D scanned volume of a carotid artery, and seperate volumes of calcifications and other constituents, these are not mutually exclusive so some might overlap...
View ArticleNegative mass fraction problem
Hi all,I am trying to simulate a furnace that has combustion reaction using a stationary solver. I use eddy dissipation model. Turbulence is modeled using k-eps model. I use transport of concentrated...
View ArticleLaser cladding tutorial
Hi everyone, I'm a student and for my thesis I have to model a laser cladding process/ powder direct energy deposition with laser. I never used COMSOL before, so I want to ask if someone have tutorials...
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Solid Mechanics equation doesn't line up with documentation
Hello,I'm trying to better understand the workings of the solid mechanics module, and I came across an apparent discrepancy between the documentation and the module itself.The momentum balance equation...
View ArticleFluid Coupling using an initial velocity condition
Hello Everyone,I am fairly new to COMSOL Multyphysics and I would appreciate any help.** I am using COMSOL Multiphysics 5.3a**. I am trying to model the 2D-fuid flow (convection and diffusion) of a...
View ArticleInlet and boundary conditions
Hi everybody,I have modelled my own weak form pdes from Naveir-Stokes equation for channel flow. Now, I do not know, how can I implement my inlet and outlet boundary conditions in this sitiuation....
View ArticleOptimization Constraints for displacement
I have COMSOL 5.2I want to minimize vol(weight) of automobile frame(1 material)I have an original model and its max strength data and want to minimize vol of new model with the same max strength of...
View ArticleElectrical Insulation between 2 domains
I have a geometry of copper and PDMS base. My geometry is exactly on top of the PDMS base. I has 2 open boundaries. I am giving voltage to one boundary and ground to other. All of this is in 3D. I...
View ArticleWarning: Identifier: root is not serializable
The below post is related to an archived discussion[start here] Warning: Identifier: root is not serializable I have exactly the same problem. But I am running additional jave stuff. Anyone has an...
View ArticleCOMSOL 5.4 "Graphics" window doesn't fill entire window (Ubuntu 16.04)
I recently installed COMSOL 5.4 on my Ubuntu 16.04 workstation with NVIDIA Quadro K2200 graphics card. Unfortunately, the Graphics window in COMSOL doesn't fill the entire space reserved for it....
View ArticleFailure to create correct Temperature profile
Hello,I am new user of COMSOL and I would like to explain my problem. I have a pellet of magnetite, where I try to heating up with Joule effect. The pellet has 13mm diameter and height of 2mm. Below...
View ArticleMPHPLOT: Figure Resolution
Hi Everyone,I am using mphplot to display contour plots within Matlab using the color table "Rainbow". The resolution of the resultant figure is really low compared wth how it looks within Comsol...
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Exporting from Matlab back to Comsol and plotting in Comsol
Hello,I want to export a variable from Matlab back into Comsol to plot it after some processing has been performed on it.Initially I exported an electric field distribution (the x,y,z components Ex,...
View ArticleSeeking help for Solid State Li battery modeling
I'm working on a project for my master thesis. I need to simulate a solid state li battery but unfortunatly our school doen't provide the liscence for the battery simulation. Therefore, I'm doing it...
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