Heat Transfer in Solid combined with HT Fluid: Problems
Hi dear members, Please I am working on a heat transfer case where I have to show the heat transfer in the fluid and on the mateial. the first one in fluid is done, but the latter on the solid is...
View Articlethermophoresis effect on particles suspended in air flowing through...
Here, I am using thermophoresis model file for reference in which hydrogen fluid flowing through pipe and particles deflect from their paths dur to heated wall. but, I want to verify thermophoresis...
View ArticleFinding Harmonics of an IDT SAW device
Hello, I have a two-port SAW device and I would like to plot scattering parameters (mainly S12) in a frequency dependent fashion. I was having trouble integrating the RF module, so I initially tried...
View ArticleCalculating contact area
Is there any way to calculate the contact area of a contact pair within COMSOL (ie without having to post-process data in MATLAB, which I have yet to try)? I have tried surface integration and other...
View ArticleUsing geometry values in physics boundary conditions
Hi all, I have tried to look around but have not figured out a way to do this. I would like to use a geometry value (i.e. the surface area of an ellipsoid) to define the flux boundary condition through...
View ArticleHeat conduction in solids - temperature dependent heat transfer coefficient
Hi, I would like to solve a simple heat conduction in solids problem with a temperature-dependent heat transfer coefficient at one of the boundaries h(T) = 1000*(300/T)^1.3 However, the result computed...
View ArticleComsol error
Hai , I am Sathya Priya.. I have few question regarding comsol multiphysics. I am designing a single axis accelerometer in comsol, which has a cantilever attached to the proof mass as a part of my...
View ArticleSimulation Error
Hi there. I am working on effect of AC electrical field on the microelectrode. However, when I tried to compute the study (either by using stationary or frequency domain), I kept getting error message...
View ArticleUnphysical solution with ellipsoid/sphere vs. hemisphere
Having a problem with COMSOL providing unphysical solutions when I use a sphere or ellipsoid "hovering" above the bottom of a domain as opposed to a hemisphere. I have a box, and within the box is a...
View ArticleTool movement
Hi to all I want have laser beam movement. In circular movement i used below equation : X : R * sin(omega * t ) Y : R * cos(omega * t ) Z : X and now i want have a rectangular movement...
View ArticleHagen–Poiseuille flow
I would like to use Comsol for a microfluidics project I'm working on. As this is my first time working with Comsol I am trying to simulate a simple problem to compare the simulation with analytical...
View Articledifferential equations with few variables in Comsol 4.2
Hi for all! I'm trying to simulate the heat and mass transfer process in wood during drying. I need to investigate the distribution of temperature T and moisture content U in the wood during the drying...
View ArticleMie scattering in 4.3
Hello, I have already seen some discussion about mid scattering of a gold nanosphere. But I the discussions I have consulted, no one has yet implemented a mie scattering program in Comsol 4.2 or 4.3...
View ArticleModeling a Sliding Constraint
I am trying to model a sliding constraint, basically a pin in a hole. To try to understand how best to apply the contraints I created a simple model of a tube and rod. The tube and rode are both 1 m...
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 ArticleIs the problem positive definite? Floquet periodic boundary conditions or PML...
Hello, I am doing some elastic wave simulations using solid mechanics module and piezoelectric module. And sometimes the DOF of my models are quite large so that I have to choose the solver manually to...
View ArticleUsing the Optimization Module for geometry examination
Geometry optiization 4.3a Simple 1D sold state battery problem (in COMSOL) Done with assistance from COMSOL M = length of anode 320 nm L = length of solid electrolyte 1500 nm objective function =...
View Articlevoltage at different coordinates
Hello every one. it is possible in COMSOL to fine the voltage at (x,y,z) coordinates? thank you
View ArticleUndefined value found.
I am using poroelasticity module to simulate soil behavior of porous materials, the error information is as follows: Undefined value found. - Detail: Undefined value found in the stiffness matrix....
View ArticleInlet Boundary velocity
Inlet boundary velocity profile = 4*s*(1-s)*Umax What is actually represent this equation? What is s? What is the different between normal velocity and Umax?
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