Poisson-continuity coupled equation
Hello, I try to model the corona discharge in wire-cylinder geometry governed by the equations: nabla (V) =- rho/epsilon0 (Poisson equation) and grad (rho) * grad (V) = rho ^ 2/epsilon0 (equation of...
View ArticleCFD Boundary Conditions for Journal Bearings
Hi all, I have recently started working with Comsol. It seems very easy to use and so far I was able to build my model and have the basic physics working. I am trying to build a journal bearing model...
View ArticleThds Electrostatics coupled convergance problem
Hi everyone! I try to simulate a 3D microstructure of a lithium ion battery (just of the anode). I simulate the electrolyte with ionic transport of 2 ion species c_el, c_elA with c_el as positive and...
View ArticlePML for SAW interdigital transducer
Hi, i'm trying to simulate an interdigital transducer for SAW on a lithium niobate substrate but i have a lot of problems adding PML. I have previously simulated using periodic conditions but now i'm...
View ArticleNACA 0012 Airfoil with Spalart-Allmaras turbulence model
Hello, I am new to COMSOL and I thought I would start with a relatively simple model: a NACA 0012 airfoil at 0 angle of attack. The domain is small and the mesh resolution is relatively coarse to get...
View ArticleMultiple-size particle tracing
Hello everyone I have a short question on the particle tracing module. Does anyone know that whether it is possible to simulat particles of different sizes in the same model. How to implement this...
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 Article2D electrostatic Force
Hi, I am modeling a slice of a simple comb capacitor in 2D. I would like to determine the force acting on the fingers. I can calculate the electric field, but when I try to determine the force through...
View ArticleEvaluation of Volumteric displacement
Hi all, I am modelling a diaphragm deformed under pressure loading in an axisymetric model. I was wondeing if there is a way to evaluate volumetric displacemnt of the diaphrgam due to displacement....
View ArticleProblem "To extract COMSOL data "
Hi I try to follow all the steps that is mentioned in the LIVELINK FOR MATLAB USER GUIDE"Start to load the model busbar from the COMSOL model library, enter the command: model = mphload('busbar'); To...
View Articlewindings providing regarding
Sir/madam, I am doing my m.tech project in modeling of motor using COMSOL.3.5a in 2D. I would like to know the way in which i can provide my three phase windings in the stator slots. Thanking you and...
View ArticlePML error
Hello I am attempting to use a PML in the acoustics-piezoelectric interaction frequency domain module. I choose cartesian coordinates type as I am working with parallelpiped geometry. When I attempt to...
View ArticleWaveguide Verification time domain (TE10)
Hello! I am testing COMSOL with a simple 2D model of a waveguide for the TE10 mode (physics: transient electromagnetic waves, study: time dependent), i am using the scattering boundary condition for...
View Articleabout heater simulation in the room
Hello! I am use comsol 4.3a , and use the non-isothermal flow physics to simulate the heater in the room. And the room has a door , and I want to set the door is open, and it is connect to the...
View ArticleThin liquid film with thermal gradient in contact with air (tpf, ht, ALE, AMR)
Dear all, I am modelling a thin film liquid in a rectangular channel (2mm), as well as the air on top of it. At the initial condition everything is within room temprature (Tc) then one side of the...
View ArticlePostprocessing-visualization of symmetric profiles
I solved the thermal stresses in a plate using two faces of symmetry, saving computational cost. I wonder if COMSOL allows me to mirror the two symmetric faces and visualize the deformation in the full...
View ArticleVarying the order of diffraction in Plasmonic Wire Grating
Hi, I am simulating in Comsol 4.2.I started simulating the PLASMONIC WIRE GRATING given in the model library.the simulation there is done by varying the angle of incidence.(in the parametric sweep...
View ArticleEvaluate parameter value in MATLAB
Hi, If I have a parameter, e.g.:>> model.param.set('outer_z', '((volume*formfactor^2)/(2*pi))^(1/3)'); How can I in the easiest way evaluate the value of this parameter (like the 'Value'-column...
View ArticleFluid-Porous Slip boundary conditon
Hello, I focus now on the flow and solute transportation simulation in the free flow and porous media. There are traditionally one singe formulation, typically Brinkman and two-domain coupling with...
View ArticleUnable to create mesh : Error Free Tetrahedral 1
Hi everybody, I am having this error when I try to mesh a 3D structure : The following features have problems : Features : Free Tetrahedral 1 I don't find a way to have more information about this...
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