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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!

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Flow 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...

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Difference 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:...

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Nano 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.

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please help me how to eliminate the perspective effect .... how do you...

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Integration 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...

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Trouble 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...

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how 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

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Time 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...

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COMSOL 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...

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How 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...

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Plastic 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...

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coil 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...

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saw 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

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Electric Field

Where can I get a tutorial about how to simulate a electric field with some geometries, I am new in comsol thank you

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insertion 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

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vibration 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...

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temperature, 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...

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corona discharge

sir/madam, how to design corona ring and fix to electrical insulator,please give me immediate answer

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Error "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...

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