Stop condition in Electromechanics(emi)
I would like to implement a stop condition similar to what is described for a moving mesh problem. The parametric study would stop when the mesh quality is lower than a certain value, inorder to...
View ArticleCoupling between PDE and Electrostatics
Dear All, Does any one have any experience of solving a steady general form of PDE with steady electrostaics module. I am trying to solve a PDE [ Div(DuE) = 0] where D is the mobility coefficient and E...
View ArticleMeshing and convergence problems
Dear Comsolians, I was finally able to draw the problem in 3D in Comsol :), am also a beginner, lol. The way I have modeled the coils is that they do not form a complete closed loop, thus I assigned...
View ArticleCoupling Surface Charge Density from Electrostatics to Electrical Circuit
Hi, I have made a model of a varying overlap capacitor with an electric potential on one side as an electret. It seems to work with just ES and ALE but once I add in CIR and set the top electrodes as...
View ArticleThermal Stress Evaluation without Solving Heat Transfer Physics
I am trying to generate Thermal Stress about the domain of a spherical body with a coupled 'Solid Mechanics' and 'Heat Transfer in Solids' physics. Instead of actually solving the heat transfer...
View Articlethe free vibration of the cantilever
Hi everyone: The initial displacement D=1.05mm, is placed on the end of the cantilever beam, to solve the velocity response of the beam end. First, I select space dimension 2D, and add physics Beam,...
View ArticleSimple Contact Mechanics Problem
Hi All, I have been struggling a little with trying to implement a contact mechanics. I am modelling indentation of a hybrid polymer base layer in 2D. The polymer base layer is a combination of two...
View ArticleIssues with Full Coupling of Physics
Good day, I am having issues with fully coupling two physics. My system contains the solid mechanics physics coupled with a general form PDE to model concentration change and the diffusive properties...
View Article2 stationary studies within one study
I am interested in solving two stationary problems on the same geometry within one study. The only difference between the two problems is that the flux boundary condition is applied to different...
View ArticleContinuous microwave oven with a conveyor belt system
Good afternoon, I simulated a continuous microwave oven with a conveyor belt system in COMSOL version 4.1. For this propose, I used the moving mesh algorithm. I tried to do the same in 4.3a version and...
View ArticleExtrap
Hello Comsol gurus, I am doing a CFD simulation in which I need to use the solution of another CFD simulation. I need to take a "slice" of the solution and use it in another geometry. As I understand,...
View Articleaccess to any solution (more than one parameter)
Hello When I do a parametric sweep with only one parameter, I can access to one particular solution with the operator "with", for example, with(1,emw.Ez) gives me the z-electric field for the first...
View ArticleParallel plate model with magnetorheological fluid under magnetic field
Hi, I am trying to model the flow fields of magnetorheological fluid between non-magnetic parallel plate and permanent magnets under magnetic field produced by permanent magnets in in COMSOL3.5a. There...
View ArticleList expressions and predefined quantities in Maltab or Java
Hello everyone, I'm looking for a way to find the "expressions and predefined quantities" a model offers within matlab or java. Via COMSOL-GUI, this is simply possible by clicking one of the two...
View Articleparametric sweep in a contact problem
The attached file shows a simple axisymmetric problem in 4.3a where a screw-shaped part is being pushed into some uniform bone by an axial force. In the attached model, there are identity pairs between...
View ArticleHeat transfer from the pipe to surroundings
Sir, We found three options for "Wall Heat transfer" in "Non-Isothermal Pipe Flow" namely 1. Temperature (nitf/nitf) 2. Temperature (nipfl/nipfl) 3. Userdefined. (with an option to check "Take average...
View ArticleMeasuring the temperature at a point
Sir, In a non-isothermal pipe flow model, we have specified wall heat transfer with external temperature as 293.15K and the check box for taking average from adjacent domains is also checked. After...
View ArticleError: 7161 The mass matrix is zero - resolve
Respected sir/ma'am, I am trying to simulate a Nano ElectroMechanical Switch(NEMS) using the following modules:a)solid, stress-strain, b) Moving Mesh, and c)Electrostatics. When i run the solver, it...
View Articleout of memory during LU factorization ?
I use comsol multiphysics 4.2 to solve a model on my computer(with 2GB RAM), I get the error "out of memory during LU factorization", but when I put the same model into another computer(the same cpu,...
View Article3D waveguide, compute electromagnetic field
I want to view the electromagnetic field (in particular the norm of E) of 3D waveguide. I haven't experience in a 3D waveguide, I have simulate always a cross-section of waveguide. First of all I...
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