Flux units in surface reaction interface module, and modeling of surface...
Hi, I am trying to model a bulk - surface reaction-diffusion system (diffusion in the solution, diffusion on the surface, and adsorption/desorption which couples the two together). The system has a...
View ArticleError: Failed to compute elastoplastic strain variables
I am using solid mechanics and Darcy's law modules. In the solid mechanics, I add soil plasticity model and use D-P model, but calculation is ending by this error. Could you tell me what is the problem...
View Articlesolver settings
Hi I'm using two physics piezoelectric and moving mesh. I want to change the thickness of the PZT layer using moving mesh and want to calculate the voltage value for each thickness. how to do it in...
View Articleconstitutive soil - double hardening yield
Hello! I'm doing my own constitutive model of soil , then I would like to know, if anybody have gotten to perform double yield surface and hardening isotropic. Thanks Mayu
View ArticleAsk the question about the particle tracing module.
I have a question when I have used particle tracing module(fpt). Because I try to utilize the condition of Particle-Particle Interaction. I don’t know how to define the interaction force of particle. E...
View ArticleElectrical Circuit and Comsoll
Dear memebers I Work with Comsol 4.3 ACDC. I know now how to import a SPICE Netlist to Comsol.But I still have a problem. I followed the exmaple in ACDC modul called "inductor in a Circuit". So to be...
View ArticleHow to mesh finer in a specific area in 3D
My model is a insulator in 3D surroundded by air, i added a small water droplet on the insulator to observe the electric field enhancement around the water droplet. So i need to focus on the small...
View ArticleHow to update dependent variables manually..
Hi , Is it possible to update the dependent variables in each step manually in COMSOL ? For example, I want to assign new values for a dependent variable (V) in each step like: V ..... if...
View Articlecouple 2D solid and 1D beam
hi, how can i couple a 1D beam and 2D solid. I want to link these on a point which is located in the same position geometrically. the beam is a cantilever.
View ArticleFailed to find a solution. The relative error (35) is greater than the...
hi, im writing this mail because im stuck with my thesis simulation. this happened when i change the value of the electrical conductivity for silicon. i change for 1.6 e-3 s/m instead 1e-12 that had...
View ArticleWhy conservation of mass is violated in Comsol - Laminar flow?
The model is simple, I use rectangle as my geometry(0.1505m*0.006m) ,and chose laminar flow as my module, then assign inlet boundary condition, which is pressure boundary,10[Pa], outlet condition is...
View ArticleTwo phase flow moving mesh + Electrostatics
Hello, I am trying to model a contact angle change by maxwell stress tensor using the moving mesh module coupled with the electrostatic (from where the electric field is calculated). The modules work...
View ArticleMarangoni Stirring / Phase Change: Weak Contribution Settings
Hi I have a problem with a weak contribution in a laser surface melting model: My model takes into account solid-liquid phase change using an enthalpy-porosity technique and liquid phase volume forces...
View Articlehow to control the temperature?
hello after heating,then entering the cooling stage,when t=20s,i want to get the whole model T=20°C with temperature suddenly jumped i know the way with ANSYS,but how to set with COMSOL what should i...
View Articleelement quadrilateral quadratic 8 nodes
Hi! How can i to do a mesh with element quadrilateral quadratic 8 nodes? Thanks!
View ArticleHow to create the material characteristic (conductivity) as a function of...
Can somebody help us? We cannot create characteristic in COMSOL. In our model we want to use the electric field as input parameter and as output we want to obtain conductivity. Please answer as soon as...
View Articlegrating reflection & transmission spectrum
Hi, I am trying to simulate a grating structure a get the reflection & transmission spectrum of that , I have tried S-parameter but no field propagate in the structure .Is S-parameter the correct...
View ArticleSimulation filament formation Laminar two phase flow (level set)
Dear all, I wonder if someone can help me. I would like to make a simulation using the Laminar two phase flow method (level set) coupled to an electrostatic simulation (ec module). Basically the idea...
View ArticlePDEs expressed in Weak Form Coupled to ODEs
Hello, I am currently using COMSOL 4.3a. I am solving a problem constituted by a set of coupled PDEs (depending on time and space), defined in a domain. To solve this, I used the Weak Form. In...
View ArticleOne way coupling- A reasonable approximation?
In the tutorial for FSI in a network of blood vessels, it has been narrated at the end in the results and discussion section for Figure 5. " The displacements are in the order of 10um, which suggest...
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