cable
Hello! Cable losses in official submarine cables follow the law of conservation of energy, that is, the sum of core loss plus metal sheath loss plus armor loss is equal to three times the square of...
View ArticleCoupling Semiconductor and Heat Transfer
Greetings!First some information on my model. I have a model of 1D PN diode. I want to measure 3 features:Lattice temperatureincreasement due to forward current.Impact Ionization Generation RateSRH...
View ArticleFull S Parameter Matrix - I activated port sweep, but S12, S22 shows no data....
Hello. My question concerns an Electomagnetic Waves, Frequency Domain model.I am trying to obtain S11, S12, S21, S22 from a 2-port rectangular waveguide having numerical ports and a sample material in...
View ArticleKinetic inductance
Hi,I am simulating superconducting microwave resonators in COMSOL and I was wondering if there is a simple method of adding kinetic inductance to PEC boundary conditions. In other words: I have an...
View ArticleSpecify certain modes in my FEM model
Hello everyone,I am a new user of COMSOL. Now I build a simple beam with a PZT patch at the fixed side. I have two question here. 1. When I add a circuit at two side of PZT, the eigenvalue solve can...
View ArticleTo investigate the effect of different pellet size on emission of CO and CO2.
what equations i should use to model these two variables.I investigate it in terms of diameter of the fuel pellet.Where i wish to use this Shrinking core theory for my exlplaination. I did read that...
View ArticleHow to set the polarization direction of the piezoelectric material
Hi everyone! I am doing a simulation about piezoelectric materials. My confusion is that if I create a piezoelectric material, the properties of this piezoelectric material change when I change its...
View ArticleHow to set continuity boundary conditions
Hi everyone!I am simulating a piezoelectric model .I don't know how to set continuity boundary conditions between two materials in the model.Best wishes Liu Hao!
View ArticleChannel
I want to make a channel which has an atomic size through which I can add some physics.If anyone have some idea regarding this plz suggest me.thank you
View ArticleTime-Dependent resonance frequency study, thermal stress study of a...
Hello,I am interested in determining the effect of a time-dependent thermal distribution on the resonance frequency of a nanostring.My geometry is a nanostring (thus, ill-conditioned) with an initial...
View ArticleStudy of tunnel fixed at both ends
Hello all,We are trying to solve FSI of a Submerged Floating Tunnel which is fixed at both ends. When i'm modelling with fixed at the Walls of the fluid domain, its not able to slove that. It always...
View ArticleFluid Flow Pressure Drop In 2D or 3D?
Hello All,I'm quite new to COMSOL and am trying to clarify something. I am running a turbulent flow model in 2D of an open object and want to know if I can extract the pressure drop from the post...
View ArticlePhase change and Fluid flow.
Hi im trying to simulate a process in wich Ethylene Glycol is heated beyond the boiling point (inducing phase change). I need to evaluate the phase change, and the fluid flow due to the change in...
View ArticleArc discharge
Hello All, I am trying to simulate arc discharge. I am sung Ar plasma chemestery. As a cimple geometry i am simulatind only two bowl as a cathod and anode in the axisymetric model. I followed the...
View ArticleDifference between measured perimeter and calculated perimeter
Hi allI am trying to cauculate the perimeter of the geometery in my model.Firstly, I used the measure function to acquire the perimeter.Secondly, I defined a interpolation function intop(1) on the...
View ArticleHow to define coaxial lumped Ports when simulating the quarter of a geometry
Hi all,I am simulating a TEM (Transverse electromagnetic) cell. The geometry have two PMC (Perfect Magnetic Conductor) symmetry planes, so I simulate only the quarter of the geometry. The two planes of...
View ArticleFlat Plate Membrane Reactor
Hi Guys,I was wondering if I might be able to get some help with current error I am receiving for the initalization of variables. I'm pretty new to comsol and according to google this might be a node...
View ArticleConvergence problem
Hi!I try to simulate a gold nanorod on glass using RF Module (see the attachment). Either I have problem with meshing or the geometry has some singularities. Actually I have been struggling with this...
View ArticleQuestion about Derivative Expression
I have a problem about derivative expression... I use T as a variable in the Partial Differential Equations model, when I check my results, I find that Tx≠0, while d(T,x)=0. Why this happen? And if I...
View ArticleThermoelectric generator
Good morning everyone,I have some difficulties to calculate the output power of a TEG generator in COMSOL. Simply, until now, I have modelised the TEG, putting two temperature boundaries condition and...
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