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Help for my case!
Hi, I am new to Comsol, and I want to simulate a water droplet falling down and pass through the 2mm gap between two circle particles. (see attached file) the important thing is that I have to consider...
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Porous Monolith in a pipe
Dear All, i'm studying heat transfer in a pipe where there is a SiC monolith surrounded by an insulating mat (see screenshot). Up to now I have studied the system considering the monolith as pure solid...
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electric field and potential distribution
Hi I have been working on a 3D (AC/DC) model of a insulator, and I am trying to verify the uniform potential and field distribution along the insulator surface. I apply 33Kv voltage at HV end. I got...
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calling a waveform from Definition node
Dear all, I want to apply AC voltage to an electrode. I built my desired stimulation waveform from Definition node. How can I call this function? Do I have to enter function name in Electric Current...
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Multiple user in Linux?
Hi, since some time I use Comsol on a Linux machine. Because of some former trouble I changed the directory used for temporary files to my home directory (followwing the advice given in solution number...
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Laminar Flow +Chemical Reaction
Hi, Can anyone please help me with my model and guide me as to where I am going wrong. I am trying to simulate a simple chemical reaction A+B-->C in a pipe filled with water flowing at laminar...
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Parametric Study making functions
Hi there, I am doing a parametric study with a variable T_initial for a frequency domain simulation for a fixed range of frequencies, this worked well I need now to change the set of frequencies with a...
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comsol 4.2a with matlab R2011a
Hi, I saved the comsol file in matlab as told. The tutorial says open ''COMSOL with MATLAB''. What does that mean? Also i get an error as follows when i run the m file of the comsol model. Undefined...
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2D Poiseuille flow, wrong solutions?
Hello all COMSOL users! I was solving a simple 2D Poiseuille flow problem on a rectangle domain. I use the "creeping flow" physical model with the "incompressible" option. And I just set the boundary...
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Wedge-on-Mirror !!
Hello,, How can we design a glass wedge layer tend a 0,5 degree angle from a thin layer in the mirror cylindrical at 3D space ?
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Need a Help!! Band diagram & extracting eigenfrequency which I solved with...
I have to plot a Band diagram in 2D Photonic Crystal. I worked in Eigenfrequency model, which I reached via RF module > Electromagnetic waves, Frequency > Eigenfrequecy. After using parametric...
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Elasticity matrix,voigt notation of PDMS
Hi, I am currently working on bio-compatible material based sensor, where i want to use PDMS (Polydimethylsiloxane) as a membrane.But I can not get Elasticity matrix,voigt notation(mechanical...
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Buoyancy effects for turbulence model
In nitf (non-isothermal flow), the way for setting the Buoyancy force is only can set the volume force(-rho*g)? However in somecase it is not accuracy for compare to the experiment result (the buoyancy...
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2D Arrow Surface Plot -- Arrow Length Logarithmic
Hello, I am plotting a 2D Surface with an arrow surface. I need to scale my arrows logarithmically, but I am unsure whether this scaling is a natural logarithm or a base 10 logarithm. Which is it? The...
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simple solidmechanics
Hi I have a simple model that a piston presses down brain tissue. The piston moves with a prescribed displacement. A problem is that the piston always moved the same distance, even I have changed...
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find the coordinates of a point in which the magnitude of derived variable at...
Hello, I am working on a 2D transient problem. I have the results and want to post processing them. I want to plot my results like this: Detect the minimum of a derived variable all over the domain at...
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Modelling a Lumped Capacitor in COMSOL (Frequency Domain EM simulation)
Hello, I am trying to critically couple a resonator to a microstrip transmission line using a lumped coupling capacitor. Does anyone know how I can do this in COMSOL. I know it is possible in HFSS. Can...
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Oscillating electric dipole source Comsol RF module
Dear All, I have question. I do simulations of plasmonic gap nanoantennas, and I want to excite antenna with dipole source which is placed and oscillate in the middle of the gap. I have questions....
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Electric Field / Potential distribution
Dear all, I am trying to simulate a structure which consists of different material layers. I would like to see Electric field and Electric Potential distributions of a certain potential applied to the...
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How can I define an PML in model solids mechanics ?
I need a help ! I'm using a model of a small rectangle onto a large rectangle 2D axisymmetric to denote of wave propagation I have to put the PML absorbed wave to not be reflects But when i put it and...
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