A simple question for COMSOL v3.5a
Hello, I am now trying to use the femlin() in COMSOL v3.5a. According to the documentation, [Ke,Le,null,ud] = femlin(fem); Ke and Le are the stiffness matrix and load vector. null is the matrix...
View ArticleModélisation des écoulements à travers un barrage en terre
SVP , est ce qu'il y a quelqu'un qui peut m'aider à modéliser les écoulements dans un barrage en terre homogène sous COMSOL multiphysics. Ci attaché le model Le niveau de l'eau se trouve à 13 m de...
View ArticleLocal coordinate system for material properties
Dear all, we are trying to do an eigenfrequency analysis of a car tire and are struggling with defining the correct elastic material properties for the tire plies. The tire plies are fibrous composites...
View ArticleA time-dependent Free molecular Flow study
Is it possible to do a time dependent simulation incorporating free molecular flow physics in a reasonable amount of time. A stationary study is pretty fast to converge, but the time dependent study...
View ArticleModeling a spring and damper system
I am having trouble modeling a simple 2D spring mass damper system. The geometry comprises the spring at the upper end anchored (fixed) attached to a square mass which in turn is attached to a damper...
View ArticleThermoelectric Model
Dear All, I am looking to find and study example models relating to thermoelectric effect modeling using COMSOL. Does anyone have any reference source/model on thermoelectrics which could be used ?...
View ArticleSome problems of Bandgap Analysis of Photonic Crystal (ver 3.5)
Hello All, I am trying to run the built-in model of Bandgap Analysis in ver 3.5. But I got some problem: Error: 6170 Failed to evaluate variable. - Variable: lambda - Global scope Failed to evaluate...
View ArticleIs possible to simulated the arc discharge temperature?
Hi! I want to know if there is possible to simulate an arc discharge on air? I'm interested only in the temperature generated.Thanks
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...
View ArticleHow to calculate photonic band gap, transmission and reflection spectra?
We want to get photonic band gap, transmission and reflection spectra of 1D or 2D PC. Could you help me how can I obtain band gap and Transmission/Reflection spectra of 1D or 2D photonic crystal? Or...
View Articlerf mems switch design (comsol 4.2a)
HeLLO, i'm working on designing a switch that should work on rf range. I'm able to draw 2d structure in work plane but still not able to fix one side of the cantilver beam. i hve following questions,...
View ArticleSimulation of a wireless power system
Hi, I am trying to simulate a wireless power system between two coils. The transmitting coil is connected parallel to a electric circuit consisting of a capacitor and a voltage source in parallel. I...
View ArticlePipe flow module / Falied to evluate variable Jacobian
I am working over a simple pipe flow problem, where I encountered with an Jacobial Error saying ; Failed to evaluate variable Jacobian. - Variable: mod1.nipfl.u3 - Geometry: 1 - Boundary: 7 10 13 I...
View ArticleSurge impedance of transmission tower
Hi everyone. I am trying to model an overhead line system, in which the transmission tower should be defined as a surge impedance. I expect the wave will go down the transmission tower and get...
View ArticleElement-Types in Comsol
Another question: I know from other CAD programs that you got Elements like PShell or PSolid or Solid186 and so on, is there any way i can see wich elements im using in Comsol or even change them?...
View ArticleCooling of a liquid inside a tube
Hi, all I want to model the cooling of a liquid metal inside a tube flowing under laminar conditions. Specifically I want to calculate the variation of the Nusselt number on the tube wall during the...
View ArticleFar field calculation of reflector antenna system
Here is the thing, I want to calculate the far- field of a reflector antenna feeded by a conical horn. And solid mechanic and ale physic interfaces added to analyse the influence on the result of...
View ArticleAbout the ploting the results
Hey Ivar, I just bulit a simple model to analyze the heat transfer. After analysis is finished, I want to plot the result. So I cut one point 2D-1, but I can not plot the temperiture variation with...
View ArticleMoving mesh 2D
Hello, I am trying to simulate the moving boundary for a 2D geometry. I started with a simple 2D geometry where 1 boundary is moving in the x-direction and 1 boundary in y-direction, but because the...
View ArticleLarge deformation - compression
Hello! I am a newbie at Comsol programming, trying to come to terms with the program. I have a very simple model of a material under compression. The material (should) undergo large deformation when...
View Article