Which solver type to use for coupled K-Epsilon and pipe flow model?
I have a heat exchanger model that I am solving with the CFD and pipe flow modules. I am unsure of which type of solver I should use. I have looked at the COMSOL example model 'heat exchanger plate'...
View ArticleTry converting to triangular mesh on these faces
Dear sir, While meshing my model, only one domain didn't get meshed. And the error shown for a face which is not meshed is "Try converting to triangular mesh on these faces". And, I was not able to...
View ArticleUndefined Value Found
I was runing a 2D model and came up with this error.. anyone can help me?? Undefined value found. - Detail: Undefined value found in the equation residual vector. .There are 912 degrees of freedom...
View ArticleProblem in direction of magnetic field
Dear all , I simulated the Two coil system with ferrite core , with primary coil and secondary coil and both are separated by distance , i have problem that , if i am exciting primary with voltage...
View ArticleCan't save file after deleting one model
I started with one model, then created a second and afterwards deleted the first one completely. Now I am unable to save the file and I also can't run any study. I think there are some variables left...
View ArticleHeaviside function simulate Acoustic emission signal
Hello, I need to apply a Heaviside function difference to simulate a Acoustic emission burst signal. Can help, how can I do this? What model should I use? I'm new working with COMSOL. Thanks, Nuno...
View ArticleVariable heat capacity
Hi! I have measured Cp for metal alloy. It has significant temperature dependence. Is it possible to use Cp(T) instead of constant Cp for transient heat transfer problems? Thanks!
View Articlecomsol35a java3d restricted access exception
hello does anybody have already met an error (9040) with java3d dealing with " restricted access exception" with mac os x ? is it connected with java itself on apple, or with comsol 35a or eventually...
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 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 ArticleStiffness in bending mode
Hello Everyone, I have been COMSOL for quite sometime and have come across a problem that I can not solve very recently. My objective is to find out the bending stiffness of a metallic nanoplate. What...
View ArticleEffect of tension on eigenfrequency
Hi, I'm trying to model the effect of tension on the eigenfrequency, and I think I'm misunderstanding the use of boundary loads. I have a long and narrow bridge (fixed at both ends, free along the...
View ArticleChange x-axis units in table plot
Hi all, I have a 3d model of diffusion from a source and am calculating surface integrals of flux over particular features in my geometry. This outputs a table of total flux vs. time point which can...
View ArticleHow to integrate a table result
Hello, I have calculated surface integrals for total flux over particular features in my geometry. This outputs a table of total flux in (mol/s) vs. time points. I would like to then be able to...
View Articleparasitic capacitance
hi, i m designing a capacitive comb drive accelerometer in this i want to take parasitic capacitance in to account in order to find capacitance but i cant find where it is...could you please help me out
View Articlewave guide
Hi, I am starting study using Femlab simulation. I have problem. Actually, i want to simulate my metamaterial design but before simulate my design, i try simulate simple design. I just make rectangular...
View Articletry/catch in matlab for COMSOL
I am doing a parametric sweep in COMSOL with the geometry. The problem is, it is a large parameter space and a few combinations which would be unreasonable to check give an error. It is a stationary...
View Articlegive specific values for every mesh point of a boundary as boundary condition
hey everybody, is it possibly to give different values for all points of the mesh on the boundary, respectively? for example, just a vector containing as many values as i have boundary mesh points, or...
View ArticlePlease send me tutorial for ultrasonic wave propogation through liquid
I need tutorial on Ultrasonic wave propogation through liquid.
View Articlemesh error
Hey, I was trying to follow the PDF on comsol website ( Model ID 15) to build a model for Helmholtz coil. I followed almost all the steps except for the dimensions, so the geometry should have no...
View Article