how 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 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 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 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...
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 ArticleMetal film with subwavelength size hole: Transmmittance and reflectance study
Hi I'm novice in comsol RF simulation. I'm trying to simulate transmittace and reflectance throught metal film with subwavelength size hole. My structure will consists of Air/metal/semiconductor...
View Articlestreamline problem
Hey, i am having some problems creating the steamlines for my Helmholtz coil. I followed the steps for the one of the model on comsol website for Helmholtz coil except other than revolve to create the...
View ArticleApplying time derivative as a dirchlet boundary condition
Hi, I need to apply the time derivative of a displacement created in a piezomaterial as the velocity for a fluid boundary..... Could someone please let me know as to how this can be handled in...
View ArticleCurrent not flowing across boundaries
I'm new to COMSOL and having some trouble getting current to flow across material boundaries in my model using the Joule Heating physics. I have a semiconductor wire with metal contacts on each end and...
View Articlewireless power transfer by pcb coil
Dear All, I want to model and simulate a wireless power transfer module. Its application is in microchip implant. The model has two 3D microstrip(PCB with substrate) coil. One for transmitter and the...
View ArticleThe ouput voltage of piezoelectric with displacement
Hello All, I am new with comsol software, now I am trying to solve the basic problem with piezoelectric device. I try to set 'electric potential ' with voltage value as 0, and set 'boundary load' to...
View ArticleAir dehumidification via liquid desiccant
Hi I want to built a model to simulate air dehumidification via liquid desiccant. In this model wet air is blown toward a tube that desiccant liquid is flowed in it. The tube is made of membrane that...
View ArticleWhat is convergence?
I'd just like to know what convergence is - in the context of COMSOL.
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