Adapative Mesh Refinement with Mapped Distribution
Hello, I'm using Comsol version 4.3 and, for some reason, when I try to use adaptive mesh refinement in the Stationary Solver's extensions, it claims I can only use triangular mesh elements for it. I...
View Articlesilencer duct
Hi I want to simulate insertion loss for ventilation ducts. I need to define inlet and outlet pressure so i can calculate insertion loss by its difference. There is a similar sample "perforated...
View Articlecan i calculate the absorption coefficients of absorber composed of...
hi, i am a new to comsol,. And i want to calculate the absorption coefficients of a absorber composed of micro-perforated plate and porous material. can i calculate the coefficients of micro-perforated...
View ArticlePML Error: Could not find any cartesian regions
Hi I am new to PML. I am using Structural mechanics module to implement PML in a cantliver to determine the waves propagating to the PML. I am getting this error: Could not find any cartesian regions....
View ArticleAdding points and lines to 3D models with parametric surfaces
Hi all, I was wondering if there is a way to add a point or line to a model in which I have a 3D block with the top surface replaced by a parametric surface derived from a DEM (digital elevation...
View ArticleElectric potential and current density analysis
Dear friends, I analyzed a model using Time-dependent solver and for the time: range (0, 0.016,1). The model is consisted of different layers with different conductivity and permittivity and a Terminal...
View ArticleHeat flux inside the multilayer structure.
How to set the heat flux at the boundary between two layers of material? As in the picture.
View ArticlePDE-interface, implementation of a 'jump' in the dependent variables at a...
Dear COMSOL-community, currently I am trying to implement a model (in COMSOL 4.3a) in order to simulate the injection of spin currents from a ferromagnet into a semiconductor via a tunnel barrier. The...
View Articlecan i use the lambda while solving eigenvalue
version 4.3a the equation in COMSOL is like: lambda^2*ea*U-lambda*da*U+...... however, in my equation, there is lambda not in the first two items in the above equation, for example, there is also...
View ArticleHow to set Point dipole polarized in xy-plane in Comsol 3.5?
I have tried to set the power source of LED as polarized Point dipole in xy-plane in Comsol 3.5, but do not know the step, Could you help me please? or can you tell me which model library to refer to?
View ArticleRotating machinery for gas liquid system in stirred vessel
Hi everyone, How can I combine multiphase system with rotating machinery system. As far as I know, the physics for rotating machinery only for single phase. But I need to run a simulation for a liquid...
View Articlehow to achieve this laser beam movement
Hi i am trying to move laser beam on surface of a square plate for layer scan. i tried from last 2 months. but i could not achieve this movement. i have attached the figure for laser beam movement....
View ArticleVariable axial and radial pith in helical structure
Hi How is it possible to define increasing axial and radial pith for helical structure(let say helix is along z direction, need to define pith as a function of z)?Can you please show me here with an...
View Articlelarge parameter sweep
I performed a parameter sweep for 5 separate parameters (3 separate values for each). So, the simulation ran 3^5=243 separate times. However, when I look under the accumulated probe table, the results...
View ArticleDrag Force
Hello, I'm new to COMSOL and I've been trying to estimate the drag force on a model I've built in Solidworks. I've looked around and it's been difficult to find information on how this can be done. The...
View ArticleAcoustic Band Structure in 2d
Hi Folks - Ive posted a couple of questions to some related discussion but it looks like they haven't been visited in a while so I thought I would make a new discussion group. I am interested in...
View ArticleBuoyancy in Water
Hi I want to model buoyancy effect of a solid in the water, which solid's density is less than water (hypothetically). How can I model it? Which MODEL should I use ? is any special trick or something?...
View ArticleDeformed geometry or moving mesh
Hello Suppose I have a rectangular object and it expands under some physics (for example, thermal expansion). Which option would capture the expansion (or contraction) in moving mesh physics- deformed...
View ArticleHow to save deformed geometry so that it can be used as new initial geometry...
Hi. I am looking the ways to save the deformed geometry at the end of analysis, and i would like to use it as a completely new initial geometry for further analysis, by clearing out the previous...
View ArticleMagnetic Force on an armature
Hello I'm dealing with a very simple problem that has been very frustrating for me! I would appreciate if any one can assist me with that. I'm modeling an E-shaped core in 2D magnetic field module. It...
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