2D geometry but illuminated from below
Hi, I want to create a 2D geometry but illuminate it from below, or out of plane, with a plane wave. Whenever I try and set the Background Field as exp(-i*emw.k0*z) (in x direction) I get errors as it...
View Articleproblem with port boundary condition
Hi, I am trying to simulate a coupler so I need to set a port as inport and I have to select "wave excitation at this port " check box but it's inactive. How can I activate it? Thanks, sara
View ArticleFlux 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 Articlethermally resistive layer
Hi everyone, I am modeling a pipe with fluid circulating within by coupling heat transfer and fluid flow and the pipe diameter is defined in the geometry section. i need to define the pipe wall...
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 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 ArticleError message "Cannot import a 2D geometry into a 3D sequence." in RE
Hi! I have a 2D Reaction Engineering modell and want to add some more physics through the Synchronize with Comsol Multiphysics. I have imported my 2D geometry to the RE model. When I then import the...
View ArticleHow to Convert a 2D model Into 3d model
I want to know that how i can convert a 2D model into 3D model for simulation. -- Vineet Bansal Project Associate, NPMASS Electronic Science Department Kurukshetra University, Haryana
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 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 Articleelement quadrilateral quadratic 8 nodes
Hi! How can i to do a mesh with element quadrilateral quadratic 8 nodes? Thanks!
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