Trouble coupling heat transfer physics for both fluids and solids
Hey all, So I'm getting stuck with my model where I try to couple three different physics. The three physics are: Electric Currents, Heat transfer in Solids, and Heat transfer in Fluids. Basically what...
View ArticlePulsating liquid surrounding the human brain
Dear COMSOL community, after reading the COMSOL documentation and this forum for a couple of weeks I am reaching out to you. I am using COMSOL V4.4. I have been desperately trying to run my simulation...
View ArticleElectric Field dependant Equation entry in COMSOL 5.2
If I want to express that the conductivity of the material depends on the Electric Field in Y direction (Ey). How should I write Ey in the equation in this case. I want to know how I can make realize...
View ArticleHeat resource and Solving
Hi, I draw cube. The material of cube is glass wool (insulation material). In side the cube there is sheet of Nickel as circle and cover as circle, the material of cover polyimide tape ( Kapton H). I...
View ArticleResolve error; MUMPS allocation factor increased
Hello everyone On running a time dependent study I get an error that "MUMPS allocation factor increased to 2.0736." I know that this error can results due to incorrect boundary conditions but I am feel...
View ArticleProblem with imported BH curve
Hello everybody, I'm pretty new to Comsol, but I think I already understand at least the basics ;) I've got a working simulation file of a magnetic coil. The used material is not from the included...
View ArticleMUMPS allocation factor increasing.
Hi, I'm simulating a Peizoresistive Pressure sensor. But whenever I run my simulation the allocation factor keeps increasing and I do not get the output. I have checked my boundary conditions and tried...
View Articlemodel a halogen lamp which will heat up a metal plate
Hello, I would like to model a halogen lamp which will heat up a metal plate. I constructed a solid cube and define 2000W on a face of the cube. the other 5 faces are insulated. I used 'diffuse...
View ArticleWhat would be your ideal COMSOL workstation?
Hello all, I am in the process of building my own COMSOL workstation, and am looking for advice. If you were building your own computer from scratch, what parts would you be sure to get (besides a...
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Advanced photonic bandgap (triangular lattice)
Hello, I'm trying to expand the photonic bandgap model (www.comsol.com/model/bandgap-a...ysis-of-a-photonic-crystal-798) to a slightly different structure, but since I'm new to photonic crystals, I'm...
View Articlesimulation of gas permeability through flexible films
How can I do Finite Element simulation of gas permeability through flexible nanocomposite films? Kindly suggest suitable physics for the simulation. Also suggest related literature.
View ArticleRun several parametric sweep in parallel
Hi, I am using parametric sweep. I am wondering if we can run several parallel parametric sweep in one study. For example, I have two parameters A and B. I want to sweep the following combinations:...
View Articlemeshing 3d conjugate heat
Hi every one Did the mesh effect the solution significantly in case of conjugate heat transfer to upper surface of duct contain fluid moving in turbulent mode ?? and which turbulent mode should I use...
View ArticleUndefined value found in the equation residual vector.
I am trying to model a pem fuel cell. Although I have entered all parameters and values, i have some errors as follows; Undefined value found. - Detail: Undefined value found in the equation residual...
View Articleorder of parametric and function sweep
Hello, my comsol program has both the parametric and function sweep. I notice the order of sweep is parametric first, then function sweep(maybe it is the default). Is there any way I can change this...
View Article3D Induction heating of a cylinder
Hey guys , I am trying to simulate the induction heating of a cylinder in 3D, using an imported coil with quite a complicated geometry. The problem is, that every time I try to solve it, COMSOL...
View Article2d input
hello! my module(2d) is 1 m*0.15 m and the thickness is 0.6 . inlet velocity=3 m/s,( heat flux (q)= 1500w/m2 ,h convection =12 w/m2.k for upper side ,you can say the area that undergo heat flux and...
View ArticleSimple optimization in comsol 5.0
Hey Everyone I'm trying to do A simple optimization in Comsol 5.0 However it keeps giving me an error. In the attached image you can se how I set it up. A quick summary: under definitions I have...
View ArticleStructural Mechanics: Periodic Boundary Conditions and Initial stress
Hello, I'm making a model of a cell in a periodic 3D solid made of high stress (Stoichiometric) Si3N4. The model has a linear material -> initial stress and strain node with the initial components...
View ArticleHeat Transfer in Solids (motion of objects inside a domain)
Hi, I am trying to model a simple 2D transient heat transfer problem. For this I move a sphere with a constant boundary temperature trough a plane making use of the Deformed Mesh and the Heat Transfer...
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