parameters
Hi everyone, I have a simple question for you. If I have a variable 'D' , coeficient difusion, depends to temperature (T) with the expression D(T)=0.29*T. the range of temperature is (900 kelvin to...
View ArticleUsing the results of iteration as input to next iteration?
I am using Comsol to calculate cooling in oil-paper isolation. The iteration is slow and does not converge easily. I have reduced the damping factor to achieve a reasonable solution. It would be fine...
View ArticleURGENT!!ERROR
Hi!during the simulation an error appears: Failed to find a solution: In segregated group 1: The relative error (0) is greater than the relative tolerance. Returned solution has not converged. What...
View Articleerror MEMS
Hi Ivan sorry if I am contacting you but I need help. I have problems with the attached exercise. The error that appears is"Failed to find a solution: In segregated group 1: The relative residual (0)...
View ArticleInternal and external natural convection seperation
Hello COMSOL Community, Firstly I would like to say thanks to everyone who so regularly contributes to these forums and breathes life into them; namely Ivar. I have been setting up a relatively complex...
View ArticleAverage velocity profile
Hello everyone, I simulated fluid flow in a medium composed of porous matrix overlaid by a channel (attached figure). I am going to plot the average velocity profile along the length to examine the...
View Articleelectrospray simulation
Hi, I'm trying to simulate an electrospray experiment using comsol 4.1 in order to see the formation of droplets leaving a needle to a plate. A high voltage is applied on the needle and the plate is...
View Articledoes a periodic boundary condition for u implement inflow u (boundary1) =...
Dear everyone, I have a question about the implementation of periodic boundary conditions for fluxes, so that the inflow through one boundary equals the outflow through the other. In comsol 3.5, this...
View ArticleSpecifying a rotating boundary condition
I would like to simulate a rotating wall condition. For simplicity, imagine a square box. On the top surface of that box there is a circle. Inside of the box is a viscous fluid. I would like to impose...
View Articleimporting txt file to create geometry in comsol 4.0a
hi can i create a geometry by importing coordinate data existing in a text file in comsol4.0a? suppose i am having (x,y) data in a text file and i want to use this data for creating geometry in...
View ArticleHow to set conditions for the internal boundaries?
How to set conditions for the internal boundaries?
View Articleimporting txt file to create geometry in comsol 4.0a
hi can i create a geometry by importing coordinate data existing in a text file in comsol4.0a? suppose i am having (x,y) data in a text file and i want to use this data for creating geometry in...
View Article2D Model Problem...
Hi all, I'm working on a model which is a 2D representation of a solid container in a multiphase-flow section. what I'm trying to model is to study the relation between the contact angle and the ratio...
View Articleelectrospray simulation
Hi, I'm trying to simulate an electrospray experiment using comsol 4.1 in order to see the formation of droplets leaving a needle to a plate. A high voltage is applied on the needle and the plate is...
View ArticleProblem: Oil Droplets Seem To Dissolve In Water (Two-Phase Flow, Level Set)
I have a problem with my "Two-Phase Flow, Level Set" simulation in COMSOL 4.2. I am trying to simulate the formation of oil droplets in water by hydrodynamic flow focusing. The water and oil are...
View ArticleMatrix has zero on diagonal
Hi experts, I mat a problem when simulate a AC/DC model. it came out as below: Failed to find a solution for the initial parameter. Segregated group1 Matrix has zero on diagonal. Returned solution is...
View ArticleSurface evaporation, condensation
Hi, I want to model surface evaporation from a water flow at 40 Celsius and observe the consequent condensation on a cold surface. Can you help me with the model that I should use? I could not find...
View ArticleCFD - Surface roughness
Hey guys I really need your help on this one! I was wondering if any of you could tell me about the default settings of surface roughness's in COMSOL? All I've found about it in the documentation is...
View ArticleVariables
Hi everyone, I have a simple question for you. If I have a variable 'D' , coeficient difusion, depends to temperature (T) with the expression D(T)=0.29*T. the range of temperature is (900 kelvin to...
View Articleparameters
Hi everyone, I have a simple question for you. If I have a variable 'D' , coeficient difusion, depends to temperature (T) with the expression D(T)=0.29*T. the range of temperature is (900 kelvin to...
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