wall effect on particle terminal velocity
in the model of 'sand settling velocity', 'symmetry' boundary is used, now I try to see the wall effect, so I changed it to 'no-slip', but COMSOL doesn't work any more. Is there any comment? Thanks!
View ArticleFlow of fluid over an obstacle
Hi. I am very new to comsol software. I have been trying to simulate the fluid flow in a microchannel. I have designed the channel in workplane and extruded it to 50um to get the 3d structure. In the...
View ArticleDifference in 3D simulation of duct to rotated 2D simulation?!?
Hi everyone! I created a simulation for a circular duct which is heated by a constant heat flux. Does it make a difference to simulate a 3 dimensional geometry or a 2 dimensional geometry (rectangle:...
View ArticleNano Dielectrics
dear sir/ madam how can i create nano composite dielectrics ? how to see the field distribution and heat transfer in nano compositedielectrics materials plz guide me.
View Articleplease help me how to eliminate the perspective effect .... how do you...
:( ....................
View ArticleIntegration with a variable integration bound
Hi, i am using a 2D axisymmetric model. For my simulation i need to evaluate for each point (r,z) the integral of f(r,z')dz' from 0 to z keeping r constant. Can you tell me how to implement this in...
View ArticleTrouble with meshing/geometry
Hello everybody, I would like to ask for some help with my model. Basically, I have a parametric curve which is then revolved to form a spherical shell. The parameters of the curve will later be...
View Articlehow to model pipe with angle
Dear friends how to model pipe with angle in comsol. this structure is possible without meshing problem? can anybody help me Please find the attachment
View ArticleTime dependent study with Joule heating and thermal expansion physics
Dear Sir, I have made two 2D geometries using Joule heating and thermal expansion physics. I am using time dependent study. So the actuation electric potential is provided using the 'Piecewise...
View ArticleCOMSOL keeps closing
Hi I have an urgent problem concerning COMSOL. I am using modes such as "weakly-compressible navier stokes" and PDE modes, and I realise for some models I cannot open; the COMSOL will load and then...
View ArticleHow to couple turbulent flow and porous flow?
Hi, I want to calculate the compressible & turbulent flow and heat transfer in porous media. Here I have two questions. 1. How to couple the turbulent flow and porous flow? 2. I want to consider...
View ArticlePlastic strain
Hi! I'm playing with plastic strain dependent on the stress level. I have problem, when stress level goes down at the same time plastic strain is going down. So i have question for you. How to define...
View Articlecoil design
Hello, I work on a cold crucible magnetic modelisation with the mf physic around 10 kHz. I want to design a 2 turns coil according to the real geometry (with little simplifications). I start with a 3D...
View Articlesaw devices
hi I am trying to model a Surface acoustic wave device using Comsol 4.3b. I want to obtain the real and imaginary part of admittance in frequence response . thanks
View ArticleElectric Field
Where can I get a tutorial about how to simulate a electric field with some geometries, I am new in comsol thank you
View Articleinsertion losses
I am trying to model a Saw devices using Comsol 4.3b. how i can to obtain the insertion losses in frequency domain??? thanks
View Articlevibration of film,model by Structural Mechanics
Recently, I model vibration of film, because I want to compare the Eigenfrequency of 3D and 2D, my model is Structural Mechanics, not Shell or membrane; I find the mesh affects the solution result, the...
View Articletemperature, pressure and field distribution
Hi all, I've designed string insulator using comsol multiphysics 4.3 (3D) i've formed a cylinder around the insulator model as a air medium and i've given the conductivity and permittivity values. But...
View Articlecorona discharge
sir/madam, how to design corona ring and fix to electrical insulator,please give me immediate answer
View ArticleError "out of memory during LU factorization" in Modeling the adsorption of...
Hi, My project is 'Modeling the electrosorption'.I tried to model adsorption of ions(Na+,Cl-) on electrodes due to applied electric field.I model using Poisson Nernst Planck equation which is made up...
View Article