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Cooling in a finite box
Hi all, Let us suppose that a sphere (radius R) made of gold is located on a infinite surface made of wood. The system is enclosed in a box (length L) filled with air with a finite size. The sphere is...
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Using previous results in new study
Hello, In my model, I have created two studies to be completed, each performing a different load on the object. I want to use the results of the load for the first study as the initial values for...
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S parameter
Hello Would anyone please explain what actually is S parameter? And also the scripts like S11, S12, what do 11 and 12 mean? Does this have anything to do to calculate reflection or transmission? Thanks
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poor convergence in MEMS electromechanical switch
Greetings: This is a grossly simplified form of a 3D model I'm doing of an electromechanical switch using the MEMS module. There's a cantilever which is at zero bias, a "gate" electrode which is biased...
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Modeling of molten droplet
how to model molten metal with solidification impinging on solid subtrate
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Symmetric meshing
Dear all, I'd like to learn if it is possible to have symmetry axis in mesh. I'm working on a 3D model, and the geometry is symmetric in both x and y axis. I'm studying on eigenfrequency analysis and...
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Magnetic and Electric Fields with the Frequency Domain
If I use the Magnetic and Electric Fields ( mef ) module, with the Frequency Domain (60 Hz ), and I apply 10A in a terminal of a wire cooper, for example , I shoud consider the current like 10A RMS or...
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Create free Quad mesh with different element size dependent on surface parameter
Hi, I am running structural mechanics simulations to calculate stress from vertical deformations. It is very simple, think about a cuboid of an elastic material and the surface gets deformed. My input...
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fail to import data from csv file
Dear colleagues, I have some trouble loading data from a cvs file using the interpolation function. My file has 4 columns. First three columns are arguments (x,y,t) and the last one is the value of the...
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Model Inputs problem (Material dispersion)
Hi, everyone! I am trying to simulate material dispersion ( gold J&C) in Frequency Domain (eigenfrequency study ) using Model Input ( Frequency) of the material. But results seems to be wrong ( I...
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Estimating the volume affected by a temperature
Hi COMSOL users, I have a question that has been driving me crazy for a while now. I'm doing a simple heat transfer model and I'm trying to estimate the volume that is above a certain temperature...
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Coefficient of isotropic diffusion in icp_torch model
Hello, I have one question to the developers of icp_torch model of PLasma module- Equlibrium discharges. What does mean the isotropic diffusion coefficient in this model in main laminar flow settings...
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Combining some curves into one the graph display on 3D plot group and or 1D...
Dear Community, Would anyone please explain how to combine some curve of the measurement results into one the graph display on 3D plot group and or 1D plot group? For example in fuel cell experiment:...
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Inflow heat flux issue
Hi everyone, It looks like I'm having a little issue while using the inflow heat flux condition in the heat transfer module. I'm studying a boiler where a burner in the middle is producing 24kW. Then...
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How to take the data from Comsol to word or ppt
Hello After simulation, when I take the snapshot of the 3D plot/1d plot to stick on word format or powerpoint, scale does not appear, only graph appears. what should I do so that scale also remain...
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Range of values....
Hi everyone..... I want to calculate the maximum change in magnetic flux density at different points... on the x and y axis. For instance if this Bz=u*I/(4pi)*integrate((y-yd)/r^3,x,0,1) is my formula...
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Laminated Electromagnet simulation
Hi all, I am simulating an electromagnet dipole and I would like to simulate the iron as a laminated core instead of a solid core. Is there any way to set the filling factor and the lamination directio...
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Solidification in binary alloys
Hi, Is there anyone working on Phase field Modeling of dendrite growth during solidification of alloys? Even though I input all the parameters and variables correctly, I am still unable to get the...
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log function
There is a variable psi_init in my model which is defined as follows: psi_init=((Vt*(((comp1.N<0)*(-log(abs(comp1.p init/ni))))+((comp1.N>=0)*log(abs(comp1.n init/ni)))))-X si)-(0.5*Egap) The...
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Uniform compression for a biomedical stent.
Dear fellow Comsol-users: I designed a biomedical stent (see pictures attached) and I am now trying to apply a uniform compression across its outer 'cylinder' surface in order to reduce its diameter. I...
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